chore: remove dependency on llama_models completely (#1344)

.pre-commit-config.yaml

@@ -8,6 +8,8 @@ repos:
     rev: v5.0.0  # Latest stable version
     hooks:
     -   id: check-merge-conflict
+    -   id: trailing-whitespace
+        exclude: '\.py$'  # Exclude Python files as Ruff already handles them
     -   id: check-added-large-files
         args: ['--maxkb=1000']
     -   id: end-of-file-fixer
@@ -83,10 +85,8 @@ repos:
       - id: distro-codegen
         name: Distribution Template Codegen
         additional_dependencies:
-          - rich
-          - pydantic
           - uv==0.6.0
-        entry: uv run python -m llama_stack.scripts.distro_codegen
+        entry: uv run --extra codegen python -m llama_stack.scripts.distro_codegen
         language: python
         pass_filenames: false
         require_serial: true

llama_stack/models/llama/datatypes.py

@@ -11,16 +11,128 @@
 # top-level folder for each specific model found within the models/ directory at
 # the top-level of this source tree.
 
+import base64
 from enum import Enum
-from typing import Any, Dict, Literal, Optional, Union
+from io import BytesIO
+from typing import Any, Dict, List, Literal, Optional, Union
 
-# import all for backwards compatibility
+from pydantic import BaseModel, ConfigDict, Field, field_serializer, field_validator
-from llama_models.datatypes import *  # noqa: F403
-from pydantic import BaseModel, ConfigDict, Field, field_validator
 from typing_extensions import Annotated
 
 from llama_stack.schema_utils import json_schema_type, register_schema
 
+# The goal is that these set of types are relevant for all Llama models.
+# That isn't the current state yet -- e.g., BuiltinTool is somewhat specific to
+# the llama3 series of models.
+
+
+class Role(Enum):
+    system = "system"
+    user = "user"
+    assistant = "assistant"
+    tool = "tool"
+
+
+class BuiltinTool(Enum):
+    brave_search = "brave_search"
+    wolfram_alpha = "wolfram_alpha"
+    photogen = "photogen"
+    code_interpreter = "code_interpreter"
+
+
+Primitive = Union[str, int, float, bool, None]
+RecursiveType = Union[Primitive, List[Primitive], Dict[str, Primitive]]
+
+
+class ToolCall(BaseModel):
+    call_id: str
+    tool_name: Union[BuiltinTool, str]
+    arguments: Dict[str, RecursiveType]
+
+    @field_validator("tool_name", mode="before")
+    @classmethod
+    def validate_field(cls, v):
+        if isinstance(v, str):
+            try:
+                return BuiltinTool(v)
+            except ValueError:
+                return v
+        return v
+
+
+class ToolPromptFormat(Enum):
+    """Prompt format for calling custom / zero shot tools.
+
+    :cvar json: JSON format for calling tools. It takes the form:
+        {
+            "type": "function",
+            "function" : {
+                "name": "function_name",
+                "description": "function_description",
+                "parameters": {...}
+            }
+        }
+    :cvar function_tag: Function tag format, pseudo-XML. This looks like:
+        <function=function_name>(parameters)</function>
+
+    :cvar python_list: Python list. The output is a valid Python expression that can be
+        evaluated to a list. Each element in the list is a function call. Example:
+        ["function_name(param1, param2)", "function_name(param1, param2)"]
+    """
+
+    json = "json"
+    function_tag = "function_tag"
+    python_list = "python_list"
+
+
+class StopReason(Enum):
+    end_of_turn = "end_of_turn"
+    end_of_message = "end_of_message"
+    out_of_tokens = "out_of_tokens"
+
+
+class RawMediaItem(BaseModel):
+    type: Literal["image"] = "image"
+    data: bytes | BytesIO
+
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+
+    @field_serializer("data")
+    def serialize_data(self, data: Optional[bytes], _info):
+        if data is None:
+            return None
+        return base64.b64encode(data).decode("utf-8")
+
+    @field_validator("data", mode="before")
+    @classmethod
+    def validate_data(cls, v):
+        if isinstance(v, str):
+            return base64.b64decode(v)
+        return v
+
+
+class RawTextItem(BaseModel):
+    type: Literal["text"] = "text"
+    text: str
+
+
+RawContentItem = Annotated[Union[RawTextItem, RawMediaItem], Field(discriminator="type")]
+
+RawContent = str | RawContentItem | List[RawContentItem]
+
+
+class RawMessage(BaseModel):
+    role: Literal["user"] | Literal["system"] | Literal["tool"] | Literal["assistant"]
+    content: RawContent
+
+    # This is for RAG but likely should be absorbed into content
+    context: Optional[RawContent] = None
+
+    # These are for the output message coming from the assistant
+    stop_reason: Optional[StopReason] = None
+    tool_calls: List[ToolCall] = Field(default_factory=list)
+
+
 register_schema(ToolCall)
 
 

llama_stack/models/llama/llama3/__init__.py

@@ -0,0 +1,5 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.

llama_stack/models/llama/llama3/args.py

@@ -0,0 +1,82 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.
+
+from dataclasses import dataclass
+from enum import Enum
+from typing import Optional
+
+
+class QuantizationScheme(Enum):
+    int4_weight_int8_dynamic_activation = "int4_weight_int8_dynamic_activation"
+
+
+@dataclass
+class QuantizationArgs:
+    scheme: Optional[QuantizationScheme] = None
+    group_size: Optional[int] = None
+    spinquant: bool = False
+
+    def __init__(self, **kwargs):
+        for k, v in kwargs.items():
+            if k == "scheme":
+                setattr(self, k, QuantizationScheme(v))
+            else:
+                if hasattr(self, k):
+                    setattr(self, k, v)
+
+
+@dataclass
+class LoRAArgs:
+    rank: int
+    scale: float
+
+
+@dataclass
+class ModelArgs:
+    dim: int = 4096
+    n_layers: int = 32
+    n_heads: int = 32
+    n_kv_heads: Optional[int] = None
+    vocab_size: int = -1
+    multiple_of: int = 256  # make SwiGLU hidden layer size multiple of large power of 2
+    ffn_dim_multiplier: Optional[float] = None
+    norm_eps: float = 1e-5
+    rope_theta: float = 500000
+    use_scaled_rope: bool = False
+
+    max_batch_size: int = 32
+    max_seq_len: int = 2048
+
+    # vision model params
+    vision_chunk_size: int = -1  # image resolution for image models
+    vision_max_num_chunks: int = 4
+    vision_num_cross_attention_layers: int = -1
+
+    quantization_args: Optional[QuantizationArgs] = None
+    lora_args: Optional[LoRAArgs] = None
+
+    def __init__(self, **kwargs):
+        for k, v in kwargs.items():
+            if k == "lora_args":
+                setattr(self, k, LoRAArgs(**v))
+            elif k == "quantization_args":
+                setattr(self, k, QuantizationArgs(**v))
+            else:
+                if hasattr(self, k):
+                    setattr(self, k, v)
+
+        if self.n_kv_heads is None:
+            self.n_kv_heads = self.n_heads
+        assert self.n_kv_heads <= self.n_heads
+        assert self.n_heads % self.n_kv_heads == 0
+        assert self.dim % self.n_heads == 0

llama_stack/models/llama/llama3/chat_format.py

@@ -0,0 +1,282 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.
+
+import io
+import uuid
+from dataclasses import dataclass
+from typing import Dict, List, Optional, Tuple
+
+from PIL import Image as PIL_Image
+
+from llama_stack.models.llama.datatypes import (
+    BuiltinTool,
+    RawContent,
+    RawMediaItem,
+    RawMessage,
+    RawTextItem,
+    Role,
+    StopReason,
+    ToolCall,
+    ToolPromptFormat,
+)
+
+from .tokenizer import Tokenizer
+from .tool_utils import ToolUtils
+
+
+@dataclass
+class VisionInput:
+    mask: List[List[int]]
+    images: List[PIL_Image.Image]
+
+
+@dataclass
+class LLMInput:
+    tokens: List[int]
+    vision: Optional[VisionInput] = None
+
+
+def role_str(role: Role) -> str:
+    role_strs = {
+        Role.user: "user",
+        Role.system: "system",
+        Role.tool: "ipython",  # special
+        Role.assistant: "assistant",
+    }
+    return role_strs[role]
+
+
+class ChatFormat:
+    possible_headers: Dict[Role, str]
+
+    def __init__(self, tokenizer: Tokenizer):
+        self.tokenizer = tokenizer
+
+        self.possible_headers = {role: f"<|start_header_id|>{role_str(role)}<|end_header_id|>\n\n" for role in Role}
+        self.vision_token = self.tokenizer.special_tokens["<|image|>"]
+
+    def _encode_header(self, role: str) -> List[int]:
+        tokens = []
+        tokens.append(self.tokenizer.special_tokens["<|start_header_id|>"])
+        tokens.extend(self.tokenizer.encode("ipython" if role == "tool" else role, bos=False, eos=False))
+        tokens.append(self.tokenizer.special_tokens["<|end_header_id|>"])
+        tokens.extend(self.tokenizer.encode("\n\n", bos=False, eos=False))
+        return tokens
+
+    def encode_content(self, content: RawContent) -> LLMInput:
+        tokens, images = self._encode_content(content, bos=True)
+        return self._model_input_from_tokens_images(tokens, images)
+
+    def _encode_content(self, content: RawContent, bos: bool = False) -> Tuple[List[int], List[PIL_Image.Image]]:
+        tokens = []
+        images = []
+
+        added_bos = False
+
+        def _process(c):
+            nonlocal added_bos, bos
+
+            if isinstance(c, str) or isinstance(c, RawTextItem):
+                if isinstance(c, RawTextItem):
+                    c = c.text
+                tokens.extend(self.tokenizer.encode(c, bos=False if added_bos else bos, eos=False))
+                added_bos = True
+
+            elif isinstance(c, RawMediaItem):
+                bos = False if added_bos else bos
+                if bos:
+                    tokens.append(self.tokenizer.special_tokens["<|begin_of_text|>"])
+                    added_bos = True
+                tokens.append(self.vision_token)
+
+                bytes_io = io.BytesIO(c.data) if isinstance(c.data, bytes) else c.data
+                image = PIL_Image.open(bytes_io)
+                image = image.convert("RGB")
+                images.append(image)
+
+        if isinstance(content, list):
+            for c in content:
+                _process(c)
+        else:
+            _process(content)
+
+        return tokens, images
+
+    def encode_message(
+        self, message: RawMessage, tool_prompt_format: ToolPromptFormat
+    ) -> Tuple[List[int], List[PIL_Image.Image]]:
+        tokens = self._encode_header(message.role)
+        images = []
+
+        def _process_content(c):
+            toks, imgs = self._encode_content(c)
+            tokens.extend(toks)
+            images.extend(imgs)
+
+        if (
+            message.role == "assistant"
+            and len(message.tool_calls) > 0
+            and message.tool_calls[0].tool_name == BuiltinTool.code_interpreter
+        ):
+            tokens.append(self.tokenizer.special_tokens["<|python_tag|>"])
+
+        _process_content(message.content)
+
+        if message.role == "user" and message.context is not None:
+            # This is RAG context; why is it here in the chat format? I don't think
+            # this is needed and can be moved upwards
+            _process_content("\n\n")
+            _process_content(message.context)
+
+        if message.role == "assistant":
+            for t in message.tool_calls:
+                content = ToolUtils.encode_tool_call(t, tool_prompt_format)
+                _process_content(content)
+
+        eom = False
+        if message.role == "assistant":
+            eom = message.stop_reason == StopReason.end_of_message
+
+        tokens.append(self.tokenizer.special_tokens["<|eom_id|>" if eom else "<|eot_id|>"])
+        return tokens, images
+
+    def encode_dialog_prompt(
+        self,
+        messages: List[RawMessage],
+        tool_prompt_format: Optional[ToolPromptFormat] = None,
+    ) -> LLMInput:
+        tool_prompt_format = tool_prompt_format or ToolPromptFormat.json
+        tokens = []
+        images = []
+        tokens.append(self.tokenizer.special_tokens["<|begin_of_text|>"])
+        for message in messages:
+            toks, imgs = self.encode_message(message, tool_prompt_format)
+            tokens.extend(toks)
+            images.extend(imgs)
+
+        # Add the start of an assistant message for the model to complete.
+        tokens.extend(self._encode_header("assistant"))
+
+        return self._model_input_from_tokens_images(tokens, images)
+
+    # TODO(this should be generic, not only for assistant messages)
+    def decode_assistant_message(self, tokens: List[int], stop_reason: StopReason) -> RawMessage:
+        content = self.tokenizer.decode(tokens)
+
+        return self.decode_assistant_message_from_content(content, stop_reason)
+
+    def decode_assistant_message_from_content(self, content: str, stop_reason: StopReason) -> RawMessage:
+        content = content.strip(" ")
+        header_str = self.possible_headers[Role.assistant]
+        if content.startswith(header_str):
+            content = content[len(header_str) :]
+
+        ipython = content.startswith("<|python_tag|>")
+        if ipython:
+            content = content[len("<|python_tag|>") :]
+
+        if content.endswith("<|eot_id|>"):
+            content = content[: -len("<|eot_id|>")]
+            stop_reason = StopReason.end_of_turn
+        elif content.endswith("<|eom_id|>"):
+            content = content[: -len("<|eom_id|>")]
+            stop_reason = StopReason.end_of_message
+
+        tool_name = None
+        tool_arguments = {}
+
+        custom_tool_info = ToolUtils.maybe_extract_custom_tool_call(content)
+        if custom_tool_info is not None:
+            tool_name, tool_arguments = custom_tool_info
+            # Sometimes when agent has custom tools alongside builin tools
+            # Agent responds for builtin tool calls in the format of the custom tools
+            # This code tries to handle that case
+            if tool_name in BuiltinTool.__members__:
+                tool_name = BuiltinTool[tool_name]
+                tool_arguments = {
+                    "query": list(tool_arguments.values())[0],
+                }
+        else:
+            builtin_tool_info = ToolUtils.maybe_extract_builtin_tool_call(content)
+            if builtin_tool_info is not None:
+                tool_name, query = builtin_tool_info
+                tool_arguments = {
+                    "query": query,
+                }
+                if tool_name in BuiltinTool.__members__:
+                    tool_name = BuiltinTool[tool_name]
+            elif ipython:
+                tool_name = BuiltinTool.code_interpreter
+                tool_arguments = {
+                    "code": content,
+                }
+
+        tool_calls = []
+        if tool_name is not None and tool_arguments is not None:
+            call_id = str(uuid.uuid4())
+            tool_calls.append(
+                ToolCall(
+                    call_id=call_id,
+                    tool_name=tool_name,
+                    arguments=tool_arguments,
+                )
+            )
+            content = ""
+
+        return RawMessage(
+            role="assistant",
+            content=content,
+            stop_reason=stop_reason,
+            tool_calls=tool_calls,
+        )
+
+    def _model_input_from_tokens_images(self, tokens: List[int], images: List[PIL_Image.Image]) -> LLMInput:
+        vision_input = None
+        if len(images) > 0:
+            vision_input = VisionInput(
+                mask=create_vision_mask(tokens, self.vision_token),
+                images=images,
+            )
+
+        return LLMInput(
+            tokens=[128256 if token == self.vision_token else token for token in tokens],
+            vision=vision_input,
+        )
+
+
+def create_vision_mask(
+    tokens: List[int],
+    vision_token: int,
+) -> List[List[int]]:
+    vision_token_locations = [i for i, token in enumerate(tokens) if token == vision_token]
+    if len(vision_token_locations) == 0:
+        return []
+
+    if len(vision_token_locations) == 1:
+        # only one image present, unmask until end of sequence
+        return [[vision_token_locations[0], -1]]
+    vision_masks = [
+        [loc1, loc2] for loc1, loc2 in zip(vision_token_locations[:-1], vision_token_locations[1:], strict=False)
+    ]
+    # last image will attend to all subsequent text
+    vision_masks.append([vision_token_locations[-1], len(tokens)])
+
+    # if there are two or more consecutive vision tokens,
+    # they should all attend to all subsequent
+    # text present
+    last_mask_end = vision_masks[-1][1]
+    for vision_mask in vision_masks[::-1]:
+        if vision_mask[0] == vision_mask[1] - 1:
+            vision_mask[1] = last_mask_end
+        last_mask_end = vision_mask[1]
+    return vision_masks

llama_stack/models/llama/llama3/interface.py

@@ -14,20 +14,19 @@
 from pathlib import Path
 from typing import List, Optional
 
-from llama_models.datatypes import (
+from termcolor import colored
+
+from llama_stack.models.llama.datatypes import (
     BuiltinTool,
     RawMessage,
     StopReason,
     ToolCall,
+    ToolDefinition,
     ToolPromptFormat,
 )
-from llama_models.llama3.api.chat_format import ChatFormat
-from llama_models.llama3.api.tokenizer import Tokenizer
-from termcolor import colored
-
-from llama_stack.models.llama.datatypes import ToolDefinition
 
 from . import template_data
+from .chat_format import ChatFormat
 from .prompt_templates import (
     BuiltinToolGenerator,
     FunctionTagCustomToolGenerator,
@@ -35,6 +34,7 @@ from .prompt_templates import (
     SystemDefaultGenerator,
     ToolResponseGenerator,
 )
+from .tokenizer import Tokenizer
 
 THIS_DIR = Path(__file__).parent
 

llama_stack/models/llama/llama3/model.py

@@ -0,0 +1,315 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# This software may be used and distributed in accordance with the terms of the Llama 3 Community License Agreement.
+
+import math
+from typing import Optional, Tuple
+
+import fairscale.nn.model_parallel.initialize as fs_init
+import torch
+import torch.nn.functional as F
+from fairscale.nn.model_parallel.layers import (
+    ColumnParallelLinear,
+    RowParallelLinear,
+    VocabParallelEmbedding,
+)
+from torch import nn
+
+from ..api import ModelArgs
+
+# **NOTE**: This code is not runnable without installing `torch` and `fairscale`
+# dependencies. These dependencies are not part of the default dependencies
+# (requirements.txt) of the `llama-models` package.
+
+
+class RMSNorm(torch.nn.Module):
+    def __init__(self, dim: int, eps: float = 1e-6):
+        super().__init__()
+        self.eps = eps
+        self.weight = nn.Parameter(torch.ones(dim))
+
+    def _norm(self, x):
+        return x * torch.rsqrt(x.pow(2).mean(-1, keepdim=True) + self.eps)
+
+    def forward(self, x):
+        output = self._norm(x.float()).type_as(x)
+        return output * self.weight
+
+
+def apply_scaling(freqs: torch.Tensor) -> torch.Tensor:
+    # Values obtained from grid search
+    scale_factor = 8
+    low_freq_factor = 1
+    high_freq_factor = 4
+    old_context_len = 8192  # original llama3 length
+
+    low_freq_wavelen = old_context_len / low_freq_factor
+    high_freq_wavelen = old_context_len / high_freq_factor
+
+    wavelen = 2 * torch.pi / freqs
+    new_freqs = torch.where(wavelen > low_freq_wavelen, freqs / scale_factor, freqs)
+    smooth = (old_context_len / wavelen - low_freq_factor) / (high_freq_factor - low_freq_factor)
+    return torch.where(
+        (wavelen >= high_freq_wavelen) & (wavelen <= low_freq_wavelen),
+        (1 - smooth) * new_freqs / scale_factor + smooth * new_freqs,
+        new_freqs,
+    )
+
+
+def precompute_freqs_cis(dim: int, end: int, theta: float = 10000.0, use_scaled: bool = False):
+    freqs = 1.0 / (theta ** (torch.arange(0, dim, 2)[: (dim // 2)].float() / dim))
+    t = torch.arange(end, device=freqs.device, dtype=torch.float32)
+    if use_scaled:
+        freqs = apply_scaling(freqs)
+    freqs = torch.outer(t, freqs)
+    freqs_cis = torch.polar(torch.ones_like(freqs), freqs)  # complex64
+    return freqs_cis
+
+
+def reshape_for_broadcast(freqs_cis: torch.Tensor, x: torch.Tensor):
+    ndim = x.ndim
+    assert 0 <= 1 < ndim
+    assert freqs_cis.shape == (x.shape[1], x.shape[-1])
+    shape = [d if i == 1 or i == ndim - 1 else 1 for i, d in enumerate(x.shape)]
+    return freqs_cis.view(*shape)
+
+
+def apply_rotary_emb(
+    xq: torch.Tensor,
+    xk: torch.Tensor,
+    freqs_cis: torch.Tensor,
+) -> Tuple[torch.Tensor, torch.Tensor]:
+    xq_ = torch.view_as_complex(xq.float().reshape(*xq.shape[:-1], -1, 2))
+    xk_ = torch.view_as_complex(xk.float().reshape(*xk.shape[:-1], -1, 2))
+    freqs_cis = reshape_for_broadcast(freqs_cis, xq_)
+    xq_out = torch.view_as_real(xq_ * freqs_cis).flatten(3)
+    xk_out = torch.view_as_real(xk_ * freqs_cis).flatten(3)
+    return xq_out.type_as(xq), xk_out.type_as(xk)
+
+
+def repeat_kv(x: torch.Tensor, n_rep: int) -> torch.Tensor:
+    """torch.repeat_interleave(x, dim=2, repeats=n_rep)"""
+    bs, slen, n_kv_heads, head_dim = x.shape
+    if n_rep == 1:
+        return x
+    return (
+        x[:, :, :, None, :]
+        .expand(bs, slen, n_kv_heads, n_rep, head_dim)
+        .reshape(bs, slen, n_kv_heads * n_rep, head_dim)
+    )
+
+
+class Attention(nn.Module):
+    def __init__(self, args: ModelArgs):
+        super().__init__()
+        self.n_kv_heads = args.n_heads if args.n_kv_heads is None else args.n_kv_heads
+        model_parallel_size = fs_init.get_model_parallel_world_size()
+        self.n_local_heads = args.n_heads // model_parallel_size
+        self.n_local_kv_heads = self.n_kv_heads // model_parallel_size
+        self.n_rep = self.n_local_heads // self.n_local_kv_heads
+        self.head_dim = args.dim // args.n_heads
+
+        self.wq = ColumnParallelLinear(
+            args.dim,
+            args.n_heads * self.head_dim,
+            bias=False,
+            gather_output=False,
+            init_method=lambda x: x,
+        )
+        self.wk = ColumnParallelLinear(
+            args.dim,
+            self.n_kv_heads * self.head_dim,
+            bias=False,
+            gather_output=False,
+            init_method=lambda x: x,
+        )
+        self.wv = ColumnParallelLinear(
+            args.dim,
+            self.n_kv_heads * self.head_dim,
+            bias=False,
+            gather_output=False,
+            init_method=lambda x: x,
+        )
+        self.wo = RowParallelLinear(
+            args.n_heads * self.head_dim,
+            args.dim,
+            bias=False,
+            input_is_parallel=True,
+            init_method=lambda x: x,
+        )
+
+        self.cache_k = torch.zeros(
+            (
+                args.max_batch_size,
+                args.max_seq_len,
+                self.n_local_kv_heads,
+                self.head_dim,
+            )
+        )
+        self.cache_v = torch.zeros(
+            (
+                args.max_batch_size,
+                args.max_seq_len,
+                self.n_local_kv_heads,
+                self.head_dim,
+            )
+        )
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        start_pos: int,
+        freqs_cis: torch.Tensor,
+        mask: Optional[torch.Tensor],
+    ):
+        bsz, seqlen, _ = x.shape
+        xq, xk, xv = self.wq(x), self.wk(x), self.wv(x)
+
+        xq = xq.view(bsz, seqlen, self.n_local_heads, self.head_dim)
+        xk = xk.view(bsz, seqlen, self.n_local_kv_heads, self.head_dim)
+        xv = xv.view(bsz, seqlen, self.n_local_kv_heads, self.head_dim)
+
+        xq, xk = apply_rotary_emb(xq, xk, freqs_cis=freqs_cis)
+
+        self.cache_k = self.cache_k.to(xq)
+        self.cache_v = self.cache_v.to(xq)
+
+        self.cache_k[:bsz, start_pos : start_pos + seqlen] = xk
+        self.cache_v[:bsz, start_pos : start_pos + seqlen] = xv
+
+        keys = self.cache_k[:bsz, : start_pos + seqlen]
+        values = self.cache_v[:bsz, : start_pos + seqlen]
+
+        # repeat k/v heads if n_kv_heads < n_heads
+        keys = repeat_kv(keys, self.n_rep)  # (bs, cache_len + seqlen, n_local_heads, head_dim)
+        values = repeat_kv(values, self.n_rep)  # (bs, cache_len + seqlen, n_local_heads, head_dim)
+
+        xq = xq.transpose(1, 2)  # (bs, n_local_heads, seqlen, head_dim)
+        keys = keys.transpose(1, 2)  # (bs, n_local_heads, cache_len + seqlen, head_dim)
+        values = values.transpose(1, 2)  # (bs, n_local_heads, cache_len + seqlen, head_dim)
+        scores = torch.matmul(xq, keys.transpose(2, 3)) / math.sqrt(self.head_dim)
+        if mask is not None:
+            scores = scores + mask  # (bs, n_local_heads, seqlen, cache_len + seqlen)
+        scores = F.softmax(scores.float(), dim=-1).type_as(xq)
+        output = torch.matmul(scores, values)  # (bs, n_local_heads, seqlen, head_dim)
+        output = output.transpose(1, 2).contiguous().view(bsz, seqlen, -1)
+        return self.wo(output)
+
+
+class FeedForward(nn.Module):
+    def __init__(
+        self,
+        dim: int,
+        hidden_dim: int,
+        multiple_of: int,
+        ffn_dim_multiplier: Optional[float],
+    ):
+        super().__init__()
+        hidden_dim = int(2 * hidden_dim / 3)
+        # custom dim factor multiplier
+        if ffn_dim_multiplier is not None:
+            hidden_dim = int(ffn_dim_multiplier * hidden_dim)
+        hidden_dim = multiple_of * ((hidden_dim + multiple_of - 1) // multiple_of)
+
+        self.w1 = ColumnParallelLinear(dim, hidden_dim, bias=False, gather_output=False, init_method=lambda x: x)
+        self.w2 = RowParallelLinear(hidden_dim, dim, bias=False, input_is_parallel=True, init_method=lambda x: x)
+        self.w3 = ColumnParallelLinear(dim, hidden_dim, bias=False, gather_output=False, init_method=lambda x: x)
+
+    def forward(self, x):
+        return self.w2(F.silu(self.w1(x)) * self.w3(x))
+
+
+class TransformerBlock(nn.Module):
+    def __init__(self, layer_id: int, args: ModelArgs):
+        super().__init__()
+        self.n_heads = args.n_heads
+        self.dim = args.dim
+        self.head_dim = args.dim // args.n_heads
+        self.attention = Attention(args)
+        self.feed_forward = FeedForward(
+            dim=args.dim,
+            hidden_dim=4 * args.dim,
+            multiple_of=args.multiple_of,
+            ffn_dim_multiplier=args.ffn_dim_multiplier,
+        )
+        self.layer_id = layer_id
+        self.attention_norm = RMSNorm(args.dim, eps=args.norm_eps)
+        self.ffn_norm = RMSNorm(args.dim, eps=args.norm_eps)
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        start_pos: int,
+        freqs_cis: torch.Tensor,
+        mask: Optional[torch.Tensor],
+    ):
+        h = x + self.attention(self.attention_norm(x), start_pos, freqs_cis, mask)
+        out = h + self.feed_forward(self.ffn_norm(h))
+        return out
+
+
+class Transformer(nn.Module):
+    def __init__(self, params: ModelArgs):
+        super().__init__()
+        self.params = params
+        self.vocab_size = params.vocab_size
+        self.n_layers = params.n_layers
+
+        self.tok_embeddings = VocabParallelEmbedding(params.vocab_size, params.dim, init_method=lambda x: x)
+
+        self.layers = torch.nn.ModuleList()
+        for layer_id in range(params.n_layers):
+            self.layers.append(TransformerBlock(layer_id, params))
+
+        self.norm = RMSNorm(params.dim, eps=params.norm_eps)
+        self.output = ColumnParallelLinear(params.dim, params.vocab_size, bias=False, init_method=lambda x: x)
+
+        self.freqs_cis = precompute_freqs_cis(
+            params.dim // params.n_heads,
+            params.max_seq_len * 2,
+            params.rope_theta,
+            params.use_scaled_rope,
+        )
+
+    @torch.inference_mode()
+    def forward(self, tokens: torch.Tensor, start_pos: int):
+        _bsz, seqlen = tokens.shape
+        h = self.tok_embeddings(tokens)
+        self.freqs_cis = self.freqs_cis.to(h.device)
+        freqs_cis = self.freqs_cis[start_pos : start_pos + seqlen]
+
+        mask = None
+        if seqlen > 1:
+            mask = torch.full((seqlen, seqlen), float("-inf"), device=tokens.device)
+
+            mask = torch.triu(mask, diagonal=1)
+
+            # https://github.com/pytorch/pytorch/issues/100005
+            # torch.triu is buggy when the device is mps: filled values are
+            # nan instead of 0.
+            if mask.device.type == torch.device("mps").type:
+                mask = torch.nan_to_num(mask, nan=0.0)
+
+            # When performing key-value caching, we compute the attention scores
+            # only for the new sequence. Thus, the matrix of scores is of size
+            # (seqlen, cache_len + seqlen), and the only masked entries are (i, j) for
+            # j > cache_len + i, since row i corresponds to token cache_len + i.
+            mask = torch.hstack([torch.zeros((seqlen, start_pos), device=tokens.device), mask]).type_as(h)
+
+        for layer in self.layers:
+            h = layer(h, start_pos, freqs_cis, mask)
+        h = self.norm(h)
+        output = self.output(h).float()
+        return output

llama_stack/models/llama/llama3/multimodal/__init__.py

@@ -0,0 +1,12 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.

llama_stack/models/llama/llama3/multimodal/encoder_utils.py

@@ -0,0 +1,179 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and its affiliates.
+import math
+from logging import getLogger
+
+import torch
+import torch.nn.functional as F
+
+from .utils import get_negative_inf_value, to_2tuple
+
+logger = getLogger()
+
+
+def resize_local_position_embedding(orig_pos_embed, grid_size):
+    """
+    Resize position embedding for vision encoder.
+    Original position embedding is [n_tiles * n_tiles + 1, dim]
+    New position embedding will be [grid_size[0] * grid_size[1] + 1, dim]
+    """
+    new_grid_size = to_2tuple(grid_size)
+    orig_grid_size = to_2tuple(int(math.sqrt(len(orig_pos_embed) - 1)))
+
+    new_pos_emb_tok, new_pos_emb_img = (
+        orig_pos_embed[:1],
+        orig_pos_embed[1:],
+    )
+    logger.info(f"resizing position embedding grid-size from {orig_grid_size} to {new_grid_size}")
+
+    new_pos_emb_img = new_pos_emb_img.reshape(1, orig_grid_size[0], orig_grid_size[1], -1).permute(0, 3, 1, 2)
+
+    new_pos_emb_img = F.interpolate(
+        new_pos_emb_img,
+        size=new_grid_size,
+        mode="bilinear",
+        align_corners=True,
+    )
+    new_pos_emb_img = new_pos_emb_img.permute(0, 2, 3, 1).reshape(1, new_grid_size[0] * new_grid_size[1], -1)[0]
+    new_pos_embed = torch.cat([new_pos_emb_tok, new_pos_emb_img], dim=0)
+    return new_pos_embed
+
+
+def initialize_global_position_embedding_from_local(pos_and_cls_embed, grid_size, x_scale, y_scale):
+    """
+    Takes a local position embedding for vision encoder and uses it
+    to initialize the global position embedding.
+    Input: local position embedding of shape [grid_size[0] * grid_size[1] + 1, dim]
+    Returns: global position embedding of shape [x_scale, y_scale, grid_size[0] * grid_size[1] + 1, dim]
+    Here x_scale and y_scale are the number of tiles along x-axis and y-axis respectively.
+    """
+    pos_embed = pos_and_cls_embed[1:]
+    cls_embed = pos_and_cls_embed[0].view(1, 1, 1, -1)
+    grid_size = to_2tuple(grid_size)
+    new_pos_emb_img = pos_embed.reshape(1, grid_size[0], grid_size[1], -1).permute(0, 3, 1, 2)
+    new_grid_size = (x_scale * grid_size[0], y_scale * grid_size[1])
+    new_pos_emb_img = F.interpolate(
+        new_pos_emb_img,
+        size=new_grid_size,
+        mode="bilinear",
+        align_corners=True,
+    )
+    new_pos_emb_img = new_pos_emb_img.permute(0, 2, 3, 1)
+    new_pos_emb_img = new_pos_emb_img.view(x_scale, grid_size[0], y_scale, grid_size[1], -1)
+    new_pos_emb_img = new_pos_emb_img.permute(0, 2, 1, 3, 4).contiguous()
+    new_pos_emb_img = new_pos_emb_img.reshape(x_scale, y_scale, grid_size[0] * grid_size[1], -1)
+    cls_embed = cls_embed.expand(x_scale, y_scale, -1, -1)
+    pos_and_cls_embed = torch.cat([cls_embed, new_pos_emb_img], dim=2)
+    return pos_and_cls_embed
+
+
+def resize_global_position_embedding(pos_and_cls_embed, grid_size, x_scale, y_scale):
+    """
+    Takes a global position embedding for vision encoder and resizes it to new size.
+    Input: global position embedding of shape [x_old, y_old, old_grid_size[0] * old_grid_size[1] + 1, dim]
+    Returns: global position embedding of shape [x_scale, y_scale, grid_size[0] * grid_size[1] + 1, dim]
+    Here x_scale and y_scale are the number of tiles along x-axis and y-axis respectively.
+    """
+    # first remove cls token
+    pos_embed = pos_and_cls_embed[:, :, 1:]
+    cls_embed = pos_and_cls_embed[:, :, 0].unsqueeze(2)
+
+    xs_old, ys_old, ntok, dim = pos_embed.shape
+    old_grid_size = int(math.sqrt(ntok))
+
+    # move to correct form for interpolation
+    pos_embed = pos_embed.view(xs_old, ys_old, old_grid_size, old_grid_size, dim)
+    pos_embed = pos_embed.permute(0, 2, 1, 3, 4).contiguous()
+    pos_embed = pos_embed.view(xs_old * old_grid_size, ys_old * old_grid_size, dim)
+    pos_embed = pos_embed.unsqueeze(0)
+
+    # interpolate
+    new_size = (grid_size[0] * x_scale, grid_size[1] * y_scale)
+    pos_embed = pos_embed.permute(0, 3, 1, 2)
+    pos_embed_resized = F.interpolate(
+        pos_embed,
+        size=new_size,
+        mode="bilinear",
+        align_corners=True,
+    )
+    pos_embed = pos_embed_resized.permute(0, 2, 3, 1)[0]
+
+    # move it back in place
+    pos_embed = pos_embed.view(x_scale, grid_size[0], y_scale, grid_size[1], dim)
+    pos_embed = pos_embed.permute(0, 2, 1, 3, 4).contiguous()
+    pos_embed = pos_embed.view(x_scale, y_scale, grid_size[0] * grid_size[1], dim)
+
+    # interpolate cls token
+    cls_embed = cls_embed.permute(2, 3, 0, 1)
+    cls_embed_resized = F.interpolate(
+        cls_embed,
+        size=(x_scale, y_scale),
+        mode="bilinear",
+        align_corners=True,
+    )
+    cls_embed = cls_embed_resized.permute(2, 3, 0, 1)
+    # add cls token back in
+    pos_and_cls_embed = torch.cat([cls_embed, pos_embed], dim=2)
+
+    return pos_and_cls_embed
+
+
+def build_encoder_attention_mask(
+    x: torch.Tensor,
+    ar: torch.Tensor,
+    ntok: int,
+    num_chunks: int,
+    n_heads: int,
+):
+    """
+    Build vision encoder attention mask that omits padding tokens.
+    """
+    masks = []
+    for arx in ar:
+        mask_i = torch.ones((num_chunks, x.shape[2], 1), dtype=x.dtype)
+        mask_i[: arx[0] * arx[1], :ntok] = 0
+        mask_i = mask_i.view(num_chunks * x.shape[2], -1)
+        mask_i = mask_i @ mask_i.T * get_negative_inf_value(x.dtype)
+        mask_i = mask_i.unsqueeze(0)
+        masks.append(mask_i)
+    masks = torch.stack(masks).to(x.device).expand(-1, n_heads, -1, -1)
+    return masks
+
+
+def expand_num_tokens_to_mult8(x):
+    num_pad_tokens = 8 - (x.shape[-2] % 8)
+    if num_pad_tokens == 0:
+        return x, 0
+    else:
+        return (
+            torch.cat(
+                [
+                    x,
+                    torch.zeros(
+                        (x.shape[0], x.shape[1], num_pad_tokens, x.shape[-1]),
+                        dtype=x.dtype,
+                        device=x.device,
+                    ),
+                ],
+                dim=-2,
+            ),
+            num_pad_tokens,
+        )
+
+
+def contract_num_tokens_from_mult8(x, num_pad_tokens):
+    if num_pad_tokens == 0:
+        return x
+    return x[:, :, :-num_pad_tokens]

llama_stack/models/llama/llama3/multimodal/image_transform.py

@@ -0,0 +1,408 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.
+
+import math
+from collections import defaultdict
+from logging import getLogger
+from typing import Any, Optional, Set, Tuple
+
+import torch
+import torchvision.transforms as tv
+from PIL import Image
+from torchvision.transforms import functional as F
+
+IMAGE_RES = 224
+
+logger = getLogger()
+
+
+class VariableSizeImageTransform(object):
+    """
+    This class accepts images of any size and dynamically resize, pads and chunks it
+    based on the image aspect ratio and the number of image chunks we allow.
+
+    The algorithm will NOT distort the image fit a certain aspect ratio, because
+    that leads to a significant degradation in image quality.
+
+    It can be summarized in 6 steps:
+    1. Find all possible canvas combinations of max_num_chunks;
+    2. Find the best canvas to fit the image;
+    3. Resize without distortion
+    4. Pad
+    5. Normalize
+    6. Chunk
+
+    For example, if an input image is of size 300x800, patch_size of 224,
+    and max_num_chunks = 8, it will find the closest aspect ratio that
+    is allowed within 8 image chunks, with some restrictions.
+    In this case, 2:4 = 2 horizontal patches and 4 vertical patches,
+    giving a total of 8 chunks.
+
+    If resize_to_max_canvas, the image will be resized (without distortion),
+    to the largest possible resolution. In this case, 388:896, and padded to 448:896,
+    where we maintain the original aspect ratio and pad with zeros value for the rest.
+    This approach minimizes the amount of padding required for any arbitrary resolution.
+
+    However, if limit_upscaling_to_patch_size is set to True,
+    the upscaling will be limited to the patch size. In the example above,
+    the image would remain 300x800 (no upscaling), and then padded to 448:896.
+
+    The final output will therefore be of shape (8, 3, 224, 224), where 2x4
+    patches are coming from the resizing and chunking.
+    """
+
+    def __init__(self, size: int = IMAGE_RES) -> None:
+        self.size = size
+        logger.info(f"VariableSizeImageTransform size: {self.size}")
+        self.to_tensor = tv.ToTensor()
+        self._mean = (0.48145466, 0.4578275, 0.40821073)
+        self._std = (0.26862954, 0.26130258, 0.27577711)
+        self.normalize = tv.Normalize(
+            mean=self._mean,
+            std=self._std,
+            inplace=True,
+        )
+        self.resample = tv.InterpolationMode.BILINEAR
+
+    @staticmethod
+    def get_factors(n: int) -> Set[int]:
+        """
+        Calculate all factors of a given number, i.e. a dividor that leaves
+        no remainder. For example, if n=12, it will return {1, 2, 3, 4, 6, 12}.
+
+        Args:
+            n (int): The number to find factors for.
+
+        Returns:
+            set: A set containing all factors of the number.
+        """
+        factors_set = set()
+
+        for i in range(1, int(n**0.5) + 1):
+            if n % i == 0:
+                factors_set.add(i)
+                factors_set.add(n // i)
+        return factors_set
+
+    def find_supported_resolutions(self, max_num_chunks: int, patch_size: int) -> torch.Tensor:
+        """
+        Computes all of the allowed resoltuions for a fixed number of chunks
+        and patch_size. Useful for when dividing an image into chunks.
+
+        Args:
+            max_num_chunks (int): Maximum number of chunks for processing.
+            patch_size (int): Size of the side of the patch.
+
+        Returns:
+            torch.Tensor: List of possible resolutions as tuples (height, width).
+
+        Example:
+            >>> max_num_chunks = 5
+            >>> patch_size = 224
+            >>> find_supported_resolutions(max_num_chunks, patch_size)
+            tensor([(224, 896), (448, 448), (224, 224), (896, 224), (224, 672),
+            (672, 224), (224, 448), (448, 224)])
+
+            Given max_num_chunks=4, patch_size=224, it will create a dictionary:
+            {
+            0.25: [(1, 4)],
+            1.0: [(2, 2), (1, 1)],
+            4.0: [(4, 1)],
+            0.33: [(1, 3)],
+            3.0: [(3, 1)],
+            0.5: [(1, 2)],
+            2.0: [(2, 1)]
+            }
+
+            and return the resolutions multiplied by the patch_size:
+            [(1*224, 4*224), (2*224, 2*224), ..., (2*224, 1*224)]
+        """
+        asp_dict = defaultdict(list)
+        for chunk_size in range(max_num_chunks, 0, -1):
+            _factors = sorted(self.get_factors(chunk_size))
+            _asp_ratios = [(factor, chunk_size // factor) for factor in _factors]
+            for height, width in _asp_ratios:
+                ratio_float = height / width
+                asp_dict[ratio_float].append((height, width))
+
+        # get the resolutions multiplied by the patch_size
+        possible_resolutions = []
+        for value in asp_dict.values():
+            for height, depth in value:
+                possible_resolutions.append((height * patch_size, depth * patch_size))
+
+        return possible_resolutions
+
+    @staticmethod
+    def get_max_res_without_distortion(
+        image_size: Tuple[int, int],
+        target_size: Tuple[int, int],
+    ) -> Tuple[int, int]:
+        """
+        Determines the maximum resolution to which an image can be resized to without distorting its
+        aspect ratio, based on the target resolution.
+
+        Args:
+            image_size (Tuple[int, int]): The original resolution of the image (height, width).
+            target_resolution (Tuple[int, int]): The desired resolution to fit the image into (height, width).
+        Returns:
+            Tuple[int, int]: The optimal dimensions (height, width) to which the image should be resized.
+        Example:
+            >>> _get_max_res_without_distortion([200, 300], target_size = [450, 200])
+            (134, 200)
+            >>> _get_max_res_without_distortion([800, 600], target_size = [450, 1300])
+            (450, 338)
+        """
+
+        original_width, original_height = image_size
+        target_width, target_height = target_size
+
+        scale_w = target_width / original_width
+        scale_h = target_height / original_height
+
+        if scale_w < scale_h:
+            new_width = target_width
+            new_height = min(math.floor(original_height * scale_w), target_height)
+        else:
+            new_height = target_height
+            new_width = min(math.floor(original_width * scale_h), target_width)
+
+        return new_width, new_height
+
+    def _pad(self, image: Image.Image, target_size) -> Image.Image:
+        new_width, new_height = target_size
+        new_im = Image.new(mode="RGB", size=(new_width, new_height), color=(0, 0, 0))  # type: ignore
+        new_im.paste(image)
+        return new_im
+
+    def _split(self, image: torch.Tensor, ncw: int, nch: int) -> torch.Tensor:
+        # Split image into number of required tiles (width x height)
+        num_channels, height, width = image.size()
+        image = image.view(num_channels, nch, height // nch, ncw, width // ncw)
+        # Permute dimensions to reorder the axes
+        image = image.permute(1, 3, 0, 2, 4).contiguous()
+        # Reshape into the desired output shape (batch_size * 4, num_channels, width/2, height/2)
+        image = image.view(ncw * nch, num_channels, height // nch, width // ncw)
+        return image
+
+    def resize_without_distortion(
+        self,
+        image: torch.Tensor,
+        target_size: Tuple[int, int],
+        max_upscaling_size: Optional[int],
+    ) -> torch.Tensor:
+        """
+        Used to resize an image to target_resolution, without distortion.
+
+        If target_size requires upscaling the image, the user can set max_upscaling_size to
+        limit the upscaling to a maximum size. In this case, since we rescale without distortion,
+        modifying target_size works as a boundary for the image's largest side.
+
+        Args:
+            resample (str): Resampling method used when resizing images.
+                Supports "nearest", "nearest_exact", "bilinear", "bicubic".
+            max_upscaling_size (int): The maximum size to upscale the image to.
+                If None, there is no limit.
+        Examples:
+        >>> target_size = (1000, 1200)
+        >>> max_upscaling_size = 600
+        >>> image_size = (400, 200)
+        >>> resize_without_distortion(image_size, target_size, max_upscaling_size)
+        (600, 300)  # new_size_without_distortion
+
+        >>> target_size = (1000, 1200)
+        >>> max_upscaling_size = 600
+        >>> image_size = (2000, 200)
+        >>> resize_without_distortion(image_size, target_size, max_upscaling_size)
+        (1000, 100)  # new_size_without_distortion
+
+        >>> target_size = (1000, 1200)
+        >>> max_upscaling_size = 2000
+        >>> image_size = (400, 200)
+        >>> resize_without_distortion(image_size, target_size, max_upscaling_size)
+        (1000, 500)  # new_size_without_distortion
+
+        >>> target_size = (1000, 1200)
+        >>> max_upscaling_size = None
+        >>> image_size = (400, 200)
+        >>> resize_without_distortion(image_size, target_size, max_upscaling_size)
+        (1000, 500)  # new_size_without_distortion
+        """
+
+        image_width, image_height = image.size
+        image_size = (image_width, image_height)
+
+        # If target_size requires upscaling, we might want to limit the upscaling to max_upscaling_size
+        if max_upscaling_size is not None:
+            new_target_width = min(max(image_width, max_upscaling_size), target_size[0])
+            new_target_height = min(max(image_height, max_upscaling_size), target_size[1])
+            target_size = (new_target_width, new_target_height)
+
+        # resize to target_size while preserving aspect ratio
+        new_size_without_distortion = self.get_max_res_without_distortion(image_size, target_size)
+
+        image = F.resize(
+            image,
+            (new_size_without_distortion[1], new_size_without_distortion[0]),
+            interpolation=self.resample,
+        )
+
+        return image
+
+    def get_best_fit(
+        self,
+        image_size: Tuple[int, int],
+        possible_resolutions: torch.Tensor,
+        resize_to_max_canvas: bool = False,
+    ) -> Tuple[int, int]:
+        """
+        Determines the best canvas possible from a list of possible resolutions to, without distortion,
+        resize an image to.
+
+        For each possible resolution, calculates the scaling factors for
+        width and height, and selects the smallest one, which is the limiting side.
+        E.g. to match the canvas you can upscale height by 2x, and width by 1.5x,
+        therefore, the maximum upscaling you can do is min(2, 1.5) = 1.5.
+
+        If upscaling is possible (any of the scaling factors is greater than 1),
+        then picks the smallest upscaling factor > 1, unless resize_to_max_canvas is True.
+
+        If upscaling is not possible, then picks the largest scaling factor <= 1, i.e.
+        reduce downscaling as much as possible.
+
+        If there are multiple resolutions with the same max scale, we pick the one with the lowest area,
+        to minimize padding. E.g., the same image can be upscaled to 224x224 and 224x448, but the latter
+        has more padding.
+
+        Args:
+            image_size (Tuple[int, int]): A tuple containing the height and width of the image.
+            possible_resolutions (torch.Tensor): A tensor of shape (N, 2) where each
+                row represents a possible resolution (height, width).
+            use_max_upscaling (bool): If True, will return the largest upscaling resolution.
+
+        Returns:
+            List[int]: The best resolution [height, width] for the given image.
+
+        Example:
+            >>> image_size = (200, 300)
+            >>> possible_resolutions = torch.tensor([[224, 672],
+            ...                                     [672, 224],
+            ...                                     [224, 448],
+            ...                                     [448, 224],
+            ...                                     [224, 224]])
+            >>> _get_smallest_upscaling_possibility(image_size, possible_resolutions)
+            [224, 448]
+
+            We have:
+                scale_w = tensor([2.2400, 0.7467, 1.4933, 0.7467, 0.7467])
+                scale_h = tensor([1.1200, 3.3600, 1.1200, 2.2400, 1.1200])
+                scales = tensor([1.1200, 0.7467, 1.1200, 0.7467, 0.7467])
+            Only one of the scales > 1:
+                upscaling_possible = tensor([1.1200, 1.1200])
+                smallest_rescale = tensor(1.1200)
+            So we pick the resolution with the smallest smallest area:
+                areas = tensor([150528, 100352]) # [672, 224], [224, 448]
+                optimal_canvas = tensor([224, 448])
+        """
+
+        original_width, original_height = image_size
+
+        # get all possible resolutions heights/widths
+        target_widths, target_heights = (
+            possible_resolutions[:, 0],
+            possible_resolutions[:, 1],
+        )
+
+        # get scaling factors to resize the image without distortion
+        scale_w = target_widths / original_width
+        scale_h = target_heights / original_height
+
+        # get the min scale between width and height (limiting side -> no distortion)
+        scales = torch.where(scale_w > scale_h, scale_h, scale_w)
+
+        # filter only scales that allow upscaling
+        upscaling_options = scales[scales >= 1]
+        if len(upscaling_options) > 0:
+            if resize_to_max_canvas:
+                selected_scale = torch.max(upscaling_options)
+            else:
+                selected_scale = torch.min(upscaling_options)
+        else:
+            # no upscaling possible,
+            # get the minimum downscaling (max scale for scales<1)
+            downscaling_options = scales[scales < 1]
+            selected_scale = torch.max(downscaling_options)
+
+        # get all resolutions that support this scaling factor,
+        # e.g. you can upscale to 224x224, 224x448, 224x672 without distortion
+        chosen_canvas = possible_resolutions[scales == selected_scale]
+
+        # if there are multiple resolutions,
+        # get the one with minimum area to reduce padding
+        if len(chosen_canvas) > 1:
+            areas = chosen_canvas[:, 0] * chosen_canvas[:, 1]
+            optimal_idx = torch.argmin(areas)
+            optimal_canvas = chosen_canvas[optimal_idx]
+        else:
+            optimal_canvas = chosen_canvas[0]
+
+        return tuple(optimal_canvas.tolist())
+
+    def __call__(
+        self,
+        image: Image.Image,
+        max_num_chunks: int,
+        normalize_img: bool = True,
+        resize_to_max_canvas: bool = False,
+    ) -> Tuple[Any, Any]:
+        """
+        Args:
+            image (PIL.Image): Image to be resized.
+            max_num_chunks (int): Maximum number of chunks to split the image into.
+            normalize_img (bool): Whether to normalize the image.
+            resize_to_max_canvas (bool): Whether to resize the image to the maximum canvas size.
+            If True, picks the canvas the allows the largest resizing without distortion.
+            If False, downsample as little as possible, including no resizing at all,
+            but never upsample, unless the image is smaller than the patch size.
+        """
+        assert max_num_chunks > 0
+        assert isinstance(image, Image.Image), type(image)
+        w, h = image.size
+
+        possible_resolutions = self.find_supported_resolutions(max_num_chunks=max_num_chunks, patch_size=self.size)
+        possible_resolutions = torch.tensor(possible_resolutions)
+
+        best_resolution = self.get_best_fit(
+            image_size=(w, h),
+            possible_resolutions=possible_resolutions,
+            resize_to_max_canvas=resize_to_max_canvas,
+        )
+
+        max_upscaling_size = None if resize_to_max_canvas else self.size
+        image = self.resize_without_distortion(image, best_resolution, max_upscaling_size)
+        image = self._pad(image, best_resolution)
+
+        image = self.to_tensor(image)
+
+        if normalize_img:
+            image = self.normalize(image)
+
+        ratio_w, ratio_h = (
+            best_resolution[0] // self.size,
+            best_resolution[1] // self.size,
+        )
+
+        image = self._split(image, ratio_w, ratio_h)  # type: ignore
+
+        ar = (ratio_h, ratio_w)
+        return image, ar

llama_stack/models/llama/llama3/multimodal/utils.py

@@ -0,0 +1,26 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.
+
+import collections
+
+import torch
+
+
+def get_negative_inf_value(dtype):
+    return torch.finfo(dtype).min
+
+
+def to_2tuple(x):
+    if isinstance(x, collections.abc.Iterable):
+        return x
+    return (x, x)

llama_stack/models/llama/llama3/prompt_templates/system_prompts.py

@@ -15,11 +15,8 @@ import textwrap
 from datetime import datetime
 from typing import Any, List, Optional
 
-from llama_models.datatypes import (
-    BuiltinTool,
-)
-
 from llama_stack.models.llama.datatypes import (
+    BuiltinTool,
     ToolDefinition,
     ToolParamDefinition,
 )

llama_stack/models/llama/llama3/template_data.py

@@ -11,7 +11,7 @@
 # top-level folder for each specific model found within the models/ directory at
 # the top-level of this source tree.
 
-from llama_models.datatypes import (
+from llama_stack.models.llama.datatypes import (
     BuiltinTool,
     StopReason,
     ToolCall,

llama_stack/models/llama/llama3/tokenizer.py

@@ -0,0 +1,214 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# This software may be used and distributed in accordance with the terms of the Llama 3 Community License Agreement.
+
+import os
+from logging import getLogger
+from pathlib import Path
+from typing import (
+    AbstractSet,
+    Collection,
+    Dict,
+    Iterator,
+    List,
+    Literal,
+    Optional,
+    Sequence,
+    Union,
+    cast,
+)
+
+import tiktoken
+from tiktoken.load import load_tiktoken_bpe
+
+logger = getLogger(__name__)
+
+
+# The tiktoken tokenizer can handle <=400k chars without
+# pyo3_runtime.PanicException.
+TIKTOKEN_MAX_ENCODE_CHARS = 400_000
+
+# https://github.com/openai/tiktoken/issues/195
+# Here we iterate over subsequences and split if we exceed the limit
+# of max consecutive non-whitespace or whitespace characters.
+MAX_NO_WHITESPACES_CHARS = 25_000
+
+
+_INSTANCE = None
+
+
+class Tokenizer:
+    """
+    Tokenizing and encoding/decoding text using the Tiktoken tokenizer.
+    """
+
+    special_tokens: Dict[str, int]
+
+    num_reserved_special_tokens = 256
+
+    pat_str = r"(?i:'s|'t|'re|'ve|'m|'ll|'d)|[^\r\n\p{L}\p{N}]?\p{L}+|\p{N}{1,3}| ?[^\s\p{L}\p{N}]+[\r\n]*|\s*[\r\n]+|\s+(?!\S)|\s+"  # noqa: E501
+
+    @classmethod
+    def get_instance(cls):
+        global _INSTANCE
+
+        if _INSTANCE is None:
+            _INSTANCE = Tokenizer(os.path.join(os.path.dirname(__file__), "tokenizer.model"))
+        return _INSTANCE
+
+    def __init__(self, model_path: str):
+        """
+        Initializes the Tokenizer with a Tiktoken model.
+
+        Args:
+            model_path (str): The path to the Tiktoken model file.
+        """
+        assert os.path.isfile(model_path), model_path
+
+        mergeable_ranks = load_tiktoken_bpe(model_path)
+        num_base_tokens = len(mergeable_ranks)
+        special_tokens = [
+            "<|begin_of_text|>",
+            "<|end_of_text|>",
+            "<|reserved_special_token_0|>",
+            "<|reserved_special_token_1|>",
+            "<|finetune_right_pad_id|>",
+            "<|step_id|>",
+            "<|start_header_id|>",
+            "<|end_header_id|>",
+            "<|eom_id|>",  # end of message
+            "<|eot_id|>",  # end of turn
+            "<|python_tag|>",
+            "<|image|>",
+        ]
+        reserved_tokens = [
+            f"<|reserved_special_token_{2 + i}|>" for i in range(self.num_reserved_special_tokens - len(special_tokens))
+        ]
+        special_tokens = special_tokens + reserved_tokens
+
+        self.special_tokens = {token: num_base_tokens + i for i, token in enumerate(special_tokens)}
+        self.model = tiktoken.Encoding(
+            name=Path(model_path).name,
+            pat_str=self.pat_str,
+            mergeable_ranks=mergeable_ranks,
+            special_tokens=self.special_tokens,
+        )
+
+        self.n_words: int = num_base_tokens + len(special_tokens)
+        # BOS / EOS token IDs
+        self.bos_id: int = self.special_tokens["<|begin_of_text|>"]
+        self.eos_id: int = self.special_tokens["<|end_of_text|>"]
+        self.eot_id: int = self.special_tokens["<|eot_id|>"]
+        self.eom_id: int = self.special_tokens["<|eom_id|>"]
+        self.python_tag_id = self.special_tokens["<|python_tag|>"]
+        self.pad_id: int = self.special_tokens["<|finetune_right_pad_id|>"]
+        self.stop_tokens = [
+            self.eos_id,
+            self.special_tokens["<|eom_id|>"],
+            self.special_tokens["<|eot_id|>"],
+        ]
+
+    def encode(
+        self,
+        s: str,
+        *,
+        bos: bool,
+        eos: bool,
+        allowed_special: Optional[Union[Literal["all"], AbstractSet[str]]] = None,
+        disallowed_special: Union[Literal["all"], Collection[str]] = (),
+    ) -> List[int]:
+        """
+        Encodes a string into a list of token IDs.
+
+        Args:
+            s (str): The input string to be encoded.
+            bos (bool): Whether to prepend the beginning-of-sequence token.
+            eos (bool): Whether to append the end-of-sequence token.
+            allowed_special ("all"|set[str]): allowed special tokens in string
+            disallowed_special ("all"|set[str]): special tokens that raise an error when in string
+
+        Returns:
+            list[int]: A list of token IDs.
+
+        By default, setting disallowed_special=() encodes a string by ignoring
+        special tokens. Specifically:
+        - Setting `disallowed_special` to () will cause all text corresponding
+          to special tokens to be encoded as natural text (insteading of raising
+          an error).
+        - Setting `allowed_special` to "all" will treat all text corresponding
+          to special tokens to be encoded as special tokens.
+        """
+        if allowed_special is None:
+            allowed_special = set()
+        assert type(s) is str
+
+        substrs = (
+            substr
+            for i in range(0, len(s), TIKTOKEN_MAX_ENCODE_CHARS)
+            for substr in self._split_whitespaces_or_nonwhitespaces(
+                s[i : i + TIKTOKEN_MAX_ENCODE_CHARS], MAX_NO_WHITESPACES_CHARS
+            )
+        )
+        t: List[int] = []
+        for substr in substrs:
+            t.extend(
+                self.model.encode(
+                    substr,
+                    allowed_special=allowed_special,
+                    disallowed_special=disallowed_special,
+                )
+            )
+        if bos:
+            t.insert(0, self.bos_id)
+        if eos:
+            t.append(self.eos_id)
+        return t
+
+    def decode(self, t: Sequence[int]) -> str:
+        """
+        Decodes a list of token IDs into a string.
+
+        Args:
+            t (List[int]): The list of token IDs to be decoded.
+
+        Returns:
+            str: The decoded string.
+        """
+        # Typecast is safe here. Tiktoken doesn't do anything list-related with the sequence.
+        return self.model.decode(cast(List[int], t))
+
+    @staticmethod
+    def _split_whitespaces_or_nonwhitespaces(s: str, max_consecutive_slice_len: int) -> Iterator[str]:
+        """
+        Splits the string `s` so that each substring contains no more than `max_consecutive_slice_len`
+        consecutive whitespaces or consecutive non-whitespaces.
+        """
+        current_slice_len = 0
+        current_slice_is_space = s[0].isspace() if len(s) > 0 else False
+        slice_start = 0
+
+        for i in range(len(s)):
+            is_now_space = s[i].isspace()
+
+            if current_slice_is_space ^ is_now_space:
+                current_slice_len = 1
+                current_slice_is_space = is_now_space
+            else:
+                current_slice_len += 1
+                if current_slice_len > max_consecutive_slice_len:
+                    yield s[slice_start:i]
+                    slice_start = i
+                    current_slice_len = 1
+        yield s[slice_start:]

llama_stack/models/llama/llama3/tool_utils.py

@@ -0,0 +1,199 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# top-level folder for each specific model found within the models/ directory at
+# the top-level of this source tree.
+import ast
+import json
+import re
+from typing import Optional, Tuple
+
+from llama_stack.models.llama.datatypes import BuiltinTool, RecursiveType, ToolCall, ToolPromptFormat
+
+BUILTIN_TOOL_PATTERN = r'\b(?P<tool_name>\w+)\.call\(query="(?P<query>[^"]*)"\)'
+CUSTOM_TOOL_CALL_PATTERN = re.compile(r"<function=(?P<function_name>[^}]+)>(?P<args>{.*?})")
+
+
+def is_json(s):
+    try:
+        parsed = json.loads(s)
+        # Return True for valid objects and not for ints, strings, etc
+        return isinstance(parsed, dict)
+    except json.JSONDecodeError:
+        return False
+    return True
+
+
+def is_valid_python_list(input_string):
+    """Check if the input string is a valid Python list of function calls"""
+    try:
+        # Try to parse the string
+        tree = ast.parse(input_string)
+
+        # Check if it's a single expression
+        if len(tree.body) != 1 or not isinstance(tree.body[0], ast.Expr):
+            return False
+
+        # Check if the expression is a list
+        expr = tree.body[0].value
+        if not isinstance(expr, ast.List):
+            return False
+
+        # Check if the list is empty
+        if len(expr.elts) == 0:
+            return False
+
+        # Check if all elements in the list are function calls
+        for element in expr.elts:
+            if not isinstance(element, ast.Call):
+                return False
+
+            # Check if the function call has a valid name
+            if not isinstance(element.func, ast.Name):
+                return False
+
+            # Check if all arguments are keyword arguments
+            if element.args or not all(isinstance(arg, ast.keyword) for arg in element.keywords):
+                return False
+
+        return True
+
+    except SyntaxError:
+        # If parsing fails, it's not a valid Python expression
+        return False
+
+
+def parse_python_list_for_function_calls(input_string):
+    """
+    Parse a Python list of function calls and
+    return a list of tuples containing the function name and arguments
+    """
+    # Parse the string into an AST
+    tree = ast.parse(input_string)
+
+    # Ensure the input is a list
+    if not isinstance(tree.body[0], ast.Expr) or not isinstance(tree.body[0].value, ast.List):
+        raise ValueError("Input must be a list of function calls")
+
+    result = []
+
+    # Iterate through each function call in the list
+    for node in tree.body[0].value.elts:
+        if isinstance(node, ast.Call):
+            function_name = node.func.id
+            function_args = {}
+
+            # Extract keyword arguments
+            for keyword in node.keywords:
+                function_args[keyword.arg] = ast.literal_eval(keyword.value)
+
+            result.append((function_name, function_args))
+
+    return result
+
+
+class ToolUtils:
+    @staticmethod
+    def is_builtin_tool_call(message_body: str) -> bool:
+        match = re.search(ToolUtils.BUILTIN_TOOL_PATTERN, message_body)
+        return match is not None
+
+    @staticmethod
+    def maybe_extract_builtin_tool_call(message_body: str) -> Optional[Tuple[str, str]]:
+        # Find the first match in the text
+        match = re.search(BUILTIN_TOOL_PATTERN, message_body)
+
+        # Check if a match is found and return it
+        if match:
+            tool_name = match.group("tool_name")
+            query = match.group("query")
+            return tool_name, query
+        else:
+            return None
+
+    @staticmethod
+    def maybe_extract_custom_tool_call(message_body: str) -> Optional[Tuple[str, str]]:
+        # NOTE: Custom function too calls are still experimental
+        # Sometimes, response is of the form
+        # {"type": "function", "name": "function_name", "parameters": {...}
+        # and some times
+        # <function=function_name>(parameters)</function>
+
+        # Find the first match in the text
+        match = re.search(CUSTOM_TOOL_CALL_PATTERN, message_body)
+        if match:
+            tool_name = match.group("function_name")
+            query = match.group("args")
+            try:
+                return tool_name, json.loads(query.replace("'", '"'))
+            except Exception as e:
+                print("Exception while parsing json query for custom tool call", query, e)
+                return None
+        elif is_json(message_body):
+            response = json.loads(message_body)
+            if ("type" in response and response["type"] == "function") or ("name" in response):
+                function_name = response["name"]
+                args = response["parameters"]
+                return function_name, args
+            else:
+                return None
+        elif is_valid_python_list(message_body):
+            res = parse_python_list_for_function_calls(message_body)
+            # FIXME: Enable multiple tool calls
+            return res[0]
+        else:
+            return None
+
+    @staticmethod
+    def encode_tool_call(t: ToolCall, tool_prompt_format: ToolPromptFormat) -> str:
+        if t.tool_name == BuiltinTool.brave_search:
+            q = t.arguments["query"]
+            return f'brave_search.call(query="{q}")'
+        elif t.tool_name == BuiltinTool.wolfram_alpha:
+            q = t.arguments["query"]
+            return f'wolfram_alpha.call(query="{q}")'
+        elif t.tool_name == BuiltinTool.photogen:
+            q = t.arguments["query"]
+            return f'photogen.call(query="{q}")'
+        elif t.tool_name == BuiltinTool.code_interpreter:
+            return t.arguments["code"]
+        else:
+            fname = t.tool_name
+
+            if tool_prompt_format == ToolPromptFormat.json:
+                return json.dumps(
+                    {
+                        "type": "function",
+                        "name": fname,
+                        "parameters": t.arguments,
+                    }
+                )
+            elif tool_prompt_format == ToolPromptFormat.function_tag:
+                args = json.dumps(t.arguments)
+                return f"<function={fname}>{args}</function>"
+
+            elif tool_prompt_format == ToolPromptFormat.python_list:
+
+                def format_value(value: RecursiveType) -> str:
+                    if isinstance(value, str):
+                        return f'"{value}"'
+                    elif isinstance(value, (int, float, bool)) or value is None:
+                        return str(value)
+                    elif isinstance(value, list):
+                        return f"[{', '.join(format_value(v) for v in value)}]"
+                    elif isinstance(value, dict):
+                        return f"{{{', '.join(f'{k}={format_value(v)}' for k, v in value.items())}}}"
+                    else:
+                        raise ValueError(f"Unsupported type: {type(value)}")
+
+                args_str = ", ".join(f"{k}={format_value(v)}" for k, v in t.arguments.items())
+                return f"[{fname}({args_str})]"
+            else:
+                raise ValueError(f"Unsupported tool prompt format: {tool_prompt_format}")

llama_stack/models/llama/llama3_1/prompts.py

@@ -14,7 +14,7 @@
 import textwrap
 from typing import List
 
-from llama_models.datatypes import (
+from llama_stack.models.llama.datatypes import (
     BuiltinTool,
     RawMessage,
     StopReason,

llama_stack/models/llama/llama3_2/prompts_text.py

@@ -13,7 +13,7 @@
 import json
 import textwrap
 
-from llama_models.datatypes import (
+from llama_stack.models.llama.datatypes import (
     RawMessage,
     StopReason,
     ToolCall,

llama_stack/models/llama/llama3_2/prompts_vision.py

@@ -14,7 +14,7 @@
 import textwrap
 from pathlib import Path
 
-from llama_models.datatypes import (
+from llama_stack.models.llama.datatypes import (
     RawMediaItem,
     RawMessage,
     RawTextItem,

llama_stack/models/llama/llama3_3/prompts.py

@@ -14,7 +14,7 @@
 import textwrap
 from typing import List
 
-from llama_models.datatypes import (
+from llama_stack.models.llama.datatypes import (
     BuiltinTool,
     RawMessage,
     StopReason,

llama_stack/models/llama/prompt_format.py

@@ -16,7 +16,9 @@ import textwrap
 from pathlib import Path
 from typing import List
 
-from llama_models.datatypes import (
+from pydantic import BaseModel, Field
+
+from llama_stack.models.llama.datatypes import (
     RawContent,
     RawMediaItem,
     RawMessage,
@@ -25,7 +27,6 @@ from llama_models.datatypes import (
     ToolCall,
     ToolPromptFormat,
 )
-from pydantic import BaseModel, Field
 
 from .llama3.interface import LLama31Interface
 from .llama3.template_data import (

llama_stack/providers/inline/inference/meta_reference/generation.py

@@ -23,13 +23,6 @@ from fairscale.nn.model_parallel.initialize import (
     initialize_model_parallel,
     model_parallel_is_initialized,
 )
-from llama_models.llama3.api.args import ModelArgs
-from llama_models.llama3.api.chat_format import ChatFormat, LLMInput
-from llama_models.llama3.api.tokenizer import Tokenizer
-from llama_models.llama3.reference_impl.model import Transformer
-from llama_models.llama3.reference_impl.multimodal.model import (
-    CrossAttentionTransformer,
-)
 from lmformatenforcer import JsonSchemaParser, TokenEnforcer, TokenEnforcerTokenizerData
 from pydantic import BaseModel
 
@@ -46,6 +39,13 @@ from llama_stack.models.llama.datatypes import (
     SamplingParams,
     TopPSamplingStrategy,
 )
+from llama_stack.models.llama.llama3.args import ModelArgs
+from llama_stack.models.llama.llama3.chat_format import ChatFormat, LLMInput
+from llama_stack.models.llama.llama3.model import Transformer
+from llama_stack.models.llama.llama3.multimodal.model import (
+    CrossAttentionTransformer,
+)
+from llama_stack.models.llama.llama3.tokenizer import Tokenizer
 from llama_stack.models.llama.sku_list import resolve_model
 from llama_stack.providers.utils.inference.prompt_adapter import (
     ChatCompletionRequestWithRawContent,

llama_stack/providers/inline/inference/meta_reference/model_parallel.py

@@ -9,10 +9,9 @@ from copy import deepcopy
 from functools import partial
 from typing import Any, Generator
 
-from llama_models.llama3.api.chat_format import ChatFormat
-from llama_models.llama3.api.tokenizer import Tokenizer
-
 from llama_stack.models.llama.datatypes import Model
+from llama_stack.models.llama.llama3.chat_format import ChatFormat
+from llama_stack.models.llama.llama3.tokenizer import Tokenizer
 from llama_stack.models.llama.sku_list import resolve_model
 from llama_stack.providers.utils.inference.prompt_adapter import (
     ChatCompletionRequestWithRawContent,

llama_stack/providers/inline/inference/meta_reference/quantization/loader.py

@@ -15,13 +15,13 @@ import torch
 from fairscale.nn.model_parallel.initialize import get_model_parallel_rank
 from fairscale.nn.model_parallel.layers import ColumnParallelLinear, RowParallelLinear
 from fairscale.nn.model_parallel.mappings import reduce_from_model_parallel_region
-from llama_models.llama3.api.args import ModelArgs
-from llama_models.llama3.reference_impl.model import Transformer, TransformerBlock
 from torch import Tensor, nn
 from torchao.quantization.GPTQ import Int8DynActInt4WeightLinear
 
 from llama_stack.apis.inference import QuantizationType
 from llama_stack.models.llama.datatypes import CheckpointQuantizationFormat
+from llama_stack.models.llama.llama3.args import ModelArgs
+from llama_stack.models.llama.llama3.model import Transformer, TransformerBlock
 from llama_stack.models.llama.sku_list import resolve_model
 
 from ..config import MetaReferenceQuantizedInferenceConfig

llama_stack/providers/inline/inference/meta_reference/quantization/scripts/quantize_checkpoint.py

@@ -22,11 +22,11 @@ from fairscale.nn.model_parallel.initialize import (
     initialize_model_parallel,
     model_parallel_is_initialized,
 )
-from llama_models.llama3.api.args import ModelArgs
-from llama_models.llama3.api.tokenizer import Tokenizer
-from llama_models.llama3.reference_impl.model import Transformer, TransformerBlock
 from torch.nn.parameter import Parameter
 
+from llama_stack.models.llama.llama3.args import ModelArgs
+from llama_stack.models.llama.llama3.model import Transformer, TransformerBlock
+from llama_stack.models.llama.llama3.tokenizer import Tokenizer
 from llama_stack.providers.inline.inference.meta_reference.quantization.fp8_impls import (
     quantize_fp8,
 )

llama_stack/providers/inline/inference/vllm/vllm.py

@@ -9,7 +9,6 @@ import os
 import uuid
 from typing import AsyncGenerator, List, Optional
 
-from llama_models.llama3.api.tokenizer import Tokenizer
 from vllm.engine.arg_utils import AsyncEngineArgs
 from vllm.engine.async_llm_engine import AsyncLLMEngine
 from vllm.sampling_params import SamplingParams as VLLMSamplingParams
@@ -36,6 +35,7 @@ from llama_stack.apis.inference import (
     ToolPromptFormat,
 )
 from llama_stack.apis.models import Model
+from llama_stack.models.llama.llama3.tokenizer import Tokenizer
 from llama_stack.models.llama.sku_list import resolve_model
 from llama_stack.providers.datatypes import ModelsProtocolPrivate
 from llama_stack.providers.utils.inference.openai_compat import (

llama_stack/providers/inline/tool_runtime/code_interpreter/__init__.py

@@ -4,13 +4,14 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-from .code_interpreter import CodeInterpreterToolRuntimeImpl
 from .config import CodeInterpreterToolConfig
 
 __all__ = ["CodeInterpreterToolConfig", "CodeInterpreterToolRuntimeImpl"]
 
 
 async def get_provider_impl(config: CodeInterpreterToolConfig, _deps):
+    from .code_interpreter import CodeInterpreterToolRuntimeImpl
+
     impl = CodeInterpreterToolRuntimeImpl(config)
     await impl.initialize()
     return impl

llama_stack/providers/remote/inference/vllm/vllm.py

@@ -7,7 +7,6 @@ import json
 import logging
 from typing import AsyncGenerator, List, Optional, Union
 
-from llama_models.datatypes import StopReason, ToolCall
 from openai import OpenAI
 
 from llama_stack.apis.common.content_types import (
@@ -42,7 +41,7 @@ from llama_stack.apis.inference import (
     ToolPromptFormat,
 )
 from llama_stack.apis.models import Model, ModelType
-from llama_stack.models.llama.datatypes import BuiltinTool
+from llama_stack.models.llama.datatypes import BuiltinTool, StopReason, ToolCall
 from llama_stack.models.llama.sku_list import all_registered_models
 from llama_stack.providers.datatypes import ModelsProtocolPrivate
 from llama_stack.providers.utils.inference.model_registry import (

llama_stack/providers/utils/inference/prompt_adapter.py

@@ -13,9 +13,6 @@ import re
 from typing import List, Optional, Tuple, Union
 
 import httpx
-from llama_models.datatypes import StopReason
-from llama_models.llama3.api.chat_format import ChatFormat
-from llama_models.llama3.api.tokenizer import Tokenizer
 from PIL import Image as PIL_Image
 
 from llama_stack.apis.common.content_types import (
@@ -44,9 +41,11 @@ from llama_stack.models.llama.datatypes import (
     RawMessage,
     RawTextItem,
     Role,
+    StopReason,
     ToolPromptFormat,
     is_multimodal,
 )
+from llama_stack.models.llama.llama3.chat_format import ChatFormat
 from llama_stack.models.llama.llama3.prompt_templates import (
     BuiltinToolGenerator,
     FunctionTagCustomToolGenerator,
@@ -54,6 +53,7 @@ from llama_stack.models.llama.llama3.prompt_templates import (
     PythonListCustomToolGenerator,
     SystemDefaultGenerator,
 )
+from llama_stack.models.llama.llama3.tokenizer import Tokenizer
 from llama_stack.models.llama.sku_list import resolve_model
 from llama_stack.providers.utils.inference import supported_inference_models
 

llama_stack/providers/utils/memory/vector_store.py

@@ -15,7 +15,6 @@ from urllib.parse import unquote
 import chardet
 import httpx
 import numpy as np
-from llama_models.llama3.api.tokenizer import Tokenizer
 from numpy.typing import NDArray
 from pypdf import PdfReader
 
@@ -27,6 +26,7 @@ from llama_stack.apis.common.content_types import (
 from llama_stack.apis.tools import RAGDocument
 from llama_stack.apis.vector_dbs import VectorDB
 from llama_stack.apis.vector_io import Chunk, QueryChunksResponse
+from llama_stack.models.llama.llama3.tokenizer import Tokenizer
 from llama_stack.providers.datatypes import Api
 from llama_stack.providers.utils.inference.prompt_adapter import (
     interleaved_content_as_str,

llama_stack/scripts/generate_prompt_format.py

@@ -13,31 +13,38 @@
 
 import importlib
 from pathlib import Path
-from typing import Optional
 
 import fire
 
-# from llama_stack.models.llama.datatypes import *  # noqa: F403
+from llama_stack.models.llama.sku_list import resolve_model
-from llama_models.llama3.reference_impl.generation import Llama
+from llama_stack.providers.inline.inference.meta_reference.config import MetaReferenceInferenceConfig
+from llama_stack.providers.inline.inference.meta_reference.generation import Llama
 
 THIS_DIR = Path(__file__).parent.resolve()
 
 
 def run_main(
-    ckpt_dir: str,
+    model_id: str,
+    checkpoint_dir: str,
     module_name: str,
     output_path: str,
-    model_parallel_size: Optional[int] = None,
 ):
     module = importlib.import_module(module_name)
     assert hasattr(module, "usecases"), f"Module {module_name} missing usecases function"
-    tokenizer_path = str(THIS_DIR.parent / "llama3/api/tokenizer.model")
+
-    generator = Llama.build(
+    config = MetaReferenceInferenceConfig(
-        ckpt_dir=ckpt_dir,
+        model=model_id,
-        tokenizer_path=tokenizer_path,
         max_seq_len=512,
         max_batch_size=1,
-        model_parallel_size=model_parallel_size,
+        checkpoint_dir=checkpoint_dir,
+    )
+    llama_model = resolve_model(model_id)
+    if not llama_model:
+        raise ValueError(f"Model {model_id} not found")
+    generator = Llama.build(
+        config=config,
+        model_id=model_id,
+        llama_model=llama_model,
     )
 
     use_cases = module.usecases()

pyproject.toml

@@ -26,7 +26,6 @@ dependencies = [
     "httpx",
     "huggingface-hub",
     "jsonschema",
-    "llama-models>=0.1.4",
     "llama-stack-client>=0.1.4",
     "prompt-toolkit",
     "python-dotenv",
@@ -76,6 +75,11 @@ docs = [
     "sphinxcontrib.mermaid",
     "tomli",
 ]
+codegen = [
+    "rich",
+    "pydantic",
+    "jinja2",
+]
 
 [project.urls]
 Homepage = "https://github.com/meta-llama/llama-stack"

requirements.txt

@@ -18,19 +18,15 @@ httpcore==1.0.7
 httpx==0.28.1
 huggingface-hub==0.29.0
 idna==3.10
-jinja2==3.1.5
 jsonschema==4.23.0
 jsonschema-specifications==2024.10.1
-llama-models==0.1.4
 llama-stack-client==0.1.4
 lxml==5.3.1
 markdown-it-py==3.0.0
-markupsafe==3.0.2
 mdurl==0.1.2
 numpy==2.2.3
 packaging==24.2
 pandas==2.2.3
-pillow==11.1.0
 prompt-toolkit==3.0.50
 pyaml==25.1.0
 pycryptodomex==3.21.0
@@ -42,7 +38,6 @@ python-dotenv==1.0.1
 pytz==2025.1
 pyyaml==6.0.2
 referencing==0.36.2
-regex==2024.11.6
 requests==2.32.3
 rich==13.9.4
 rpds-py==0.22.3
@@ -50,7 +45,6 @@ setuptools==75.8.0
 six==1.17.0
 sniffio==1.3.1
 termcolor==2.5.0
-tiktoken==0.9.0
 tqdm==4.67.1
 typing-extensions==4.12.2
 tzdata==2025.1

uv.lock

@@ -850,22 +850,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/c9/fb/108ecd1fe961941959ad0ee4e12ee7b8b1477247f30b1fdfd83ceaf017f0/jupyter_core-5.7.2-py3-none-any.whl", hash = "sha256:4f7315d2f6b4bcf2e3e7cb6e46772eba760ae459cd1f59d29eb57b0a01bd7409", size = 28965 },
 ]
 
-[[package]]
-name = "llama-models"
-version = "0.1.4"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "jinja2" },
-    { name = "pillow" },
-    { name = "pydantic" },
-    { name = "pyyaml" },
-    { name = "tiktoken" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/09/45/b998beea5e4e69c80f0624cbcc5a1c00aefbd4bf145bcbee11231f92c5f0/llama_models-0.1.4.tar.gz", hash = "sha256:757052ed6a5a651d3731301e157ddd50f5e0d47dab3249cb73f0200af440b667", size = 1568978 }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/2b/92/7d9076b32c9bafef3225c79c947a0b70a32b5ee951ecbd81636f5b6b3877/llama_models-0.1.4-py3-none-any.whl", hash = "sha256:11946d1dce5e2f45e2bf80b4aeb4ced3d7a4917905f109ebcb9dffa81d3cbe9c", size = 1587928 },
-]
-
 [[package]]
 name = "llama-stack"
 version = "0.1.4"
@@ -876,7 +860,6 @@ dependencies = [
     { name = "httpx" },
     { name = "huggingface-hub" },
     { name = "jsonschema" },
-    { name = "llama-models" },
     { name = "llama-stack-client" },
     { name = "prompt-toolkit" },
     { name = "pydantic" },
@@ -888,6 +871,11 @@ dependencies = [
 ]
 
 [package.optional-dependencies]
+codegen = [
+    { name = "jinja2" },
+    { name = "pydantic" },
+    { name = "rich" },
+]
 dev = [
     { name = "black" },
     { name = "fastapi" },
@@ -940,8 +928,8 @@ requires-dist = [
     { name = "groq", marker = "extra == 'test'" },
     { name = "httpx" },
     { name = "huggingface-hub" },
+    { name = "jinja2", marker = "extra == 'codegen'" },
     { name = "jsonschema" },
-    { name = "llama-models", specifier = ">=0.1.4" },
     { name = "llama-stack-client", specifier = ">=0.1.4" },
     { name = "lm-format-enforcer", marker = "extra == 'test'", specifier = ">=0.10.9" },
     { name = "myst-parser", marker = "extra == 'docs'" },
@@ -953,12 +941,14 @@ requires-dist = [
     { name = "pre-commit", marker = "extra == 'dev'" },
     { name = "prompt-toolkit" },
     { name = "pydantic", specifier = ">=2" },
+    { name = "pydantic", marker = "extra == 'codegen'" },
     { name = "pytest", marker = "extra == 'dev'" },
     { name = "pytest-asyncio", marker = "extra == 'dev'" },
     { name = "pytest-html", marker = "extra == 'dev'" },
     { name = "python-dotenv" },
     { name = "requests" },
     { name = "rich" },
+    { name = "rich", marker = "extra == 'codegen'" },
     { name = "ruamel-yaml", marker = "extra == 'dev'" },
     { name = "ruff", marker = "extra == 'dev'" },
     { name = "setuptools" },
@@ -2095,75 +2085,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/c1/b1/3baf80dc6d2b7bc27a95a67752d0208e410351e3feb4eb78de5f77454d8d/referencing-0.36.2-py3-none-any.whl", hash = "sha256:e8699adbbf8b5c7de96d8ffa0eb5c158b3beafce084968e2ea8bb08c6794dcd0", size = 26775 },
 ]
 
-[[package]]
-name = "regex"
-version = "2024.11.6"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/8e/5f/bd69653fbfb76cf8604468d3b4ec4c403197144c7bfe0e6a5fc9e02a07cb/regex-2024.11.6.tar.gz", hash = "sha256:7ab159b063c52a0333c884e4679f8d7a85112ee3078fe3d9004b2dd875585519", size = 399494 }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/95/3c/4651f6b130c6842a8f3df82461a8950f923925db8b6961063e82744bddcc/regex-2024.11.6-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:ff590880083d60acc0433f9c3f713c51f7ac6ebb9adf889c79a261ecf541aa91", size = 482674 },
-    { url = "https://files.pythonhosted.org/packages/15/51/9f35d12da8434b489c7b7bffc205c474a0a9432a889457026e9bc06a297a/regex-2024.11.6-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:658f90550f38270639e83ce492f27d2c8d2cd63805c65a13a14d36ca126753f0", size = 287684 },
-    { url = "https://files.pythonhosted.org/packages/bd/18/b731f5510d1b8fb63c6b6d3484bfa9a59b84cc578ac8b5172970e05ae07c/regex-2024.11.6-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:164d8b7b3b4bcb2068b97428060b2a53be050085ef94eca7f240e7947f1b080e", size = 284589 },
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