add databricks provider (#83)

* add databricks provider

* update provider and test

llama_stack/distribution/templates/local-databricks-build.yaml

@@ -0,0 +1,10 @@
+name: local-databricks
+distribution_spec:
+  description: Use Databricks for running LLM inference
+  providers:
+    inference: remote::databricks
+    memory: meta-reference
+    safety: meta-reference
+    agents: meta-reference
+    telemetry: meta-reference
+image_type: conda

llama_stack/providers/adapters/inference/databricks/__init__.py

@@ -0,0 +1,16 @@
+# 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.
+
+from .config import DatabricksImplConfig
+from .databricks import DatabricksInferenceAdapter
+
+async def get_adapter_impl(config: DatabricksImplConfig, _deps):
+    assert isinstance(
+        config, DatabricksImplConfig
+    ), f"Unexpected config type: {type(config)}"
+    impl = DatabricksInferenceAdapter(config)
+    await impl.initialize()
+    return impl

llama_stack/providers/adapters/inference/databricks/config.py

@@ -0,0 +1,22 @@
+# 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.
+
+from typing import Optional
+
+from llama_models.schema_utils import json_schema_type
+from pydantic import BaseModel, Field
+
+
+@json_schema_type
+class DatabricksImplConfig(BaseModel):
+    url: str = Field(
+        default=None,
+        description="The URL for the Databricks model serving endpoint",
+    )
+    api_token: str = Field(
+        default=None,
+        description="The Databricks API token",
+    )

llama_stack/providers/adapters/inference/databricks/databricks.py

@@ -0,0 +1,257 @@
+# 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.
+
+from typing import AsyncGenerator
+
+from openai import OpenAI
+
+from llama_models.llama3.api.chat_format import ChatFormat
+
+from llama_models.llama3.api.datatypes import Message, StopReason
+from llama_models.llama3.api.tokenizer import Tokenizer
+from llama_models.sku_list import resolve_model
+
+from llama_stack.apis.inference import *  # noqa: F403
+from llama_stack.providers.utils.inference.augment_messages import (
+    augment_messages_for_tools,
+)
+
+from .config import DatabricksImplConfig
+
+DATABRICKS_SUPPORTED_MODELS = {
+    "Llama3.1-70B-Instruct": "databricks-meta-llama-3-1-70b-instruct",
+    "Llama3.1-405B-Instruct": "databricks-meta-llama-3-1-405b-instruct",
+}
+
+
+class DatabricksInferenceAdapter(Inference):
+    def __init__(self, config: DatabricksImplConfig) -> None:
+        self.config = config
+        tokenizer = Tokenizer.get_instance()
+        self.formatter = ChatFormat(tokenizer)
+
+    @property
+    def client(self) -> OpenAI:
+        return OpenAI(
+            base_url=self.config.url, 
+            api_key=self.config.api_token
+        )
+
+    async def initialize(self) -> None:
+        return
+
+    async def shutdown(self) -> None:
+        pass
+
+    async def validate_routing_keys(self, routing_keys: list[str]) -> None:
+        # these are the model names the Llama Stack will use to route requests to this provider
+        # perform validation here if necessary
+        pass
+
+    async def completion(self, request: CompletionRequest) -> AsyncGenerator:
+        raise NotImplementedError()
+
+    def _messages_to_databricks_messages(self, messages: list[Message]) -> list:
+        databricks_messages = []
+        for message in messages:
+            if message.role == "ipython":
+                role = "tool"
+            else:
+                role = message.role
+            databricks_messages.append({"role": role, "content": message.content})
+
+        return databricks_messages
+
+    def resolve_databricks_model(self, model_name: str) -> str:
+        model = resolve_model(model_name)
+        assert (
+            model is not None
+            and model.descriptor(shorten_default_variant=True)
+            in DATABRICKS_SUPPORTED_MODELS
+        ), f"Unsupported model: {model_name}, use one of the supported models: {','.join(DATABRICKS_SUPPORTED_MODELS.keys())}"
+
+        return DATABRICKS_SUPPORTED_MODELS.get(
+            model.descriptor(shorten_default_variant=True)
+        )
+
+    def get_databricks_chat_options(self, request: ChatCompletionRequest) -> dict:
+        options = {}
+        if request.sampling_params is not None:
+            for attr in {"temperature", "top_p", "top_k", "max_tokens"}:
+                if getattr(request.sampling_params, attr):
+                    options[attr] = getattr(request.sampling_params, attr)
+
+        return options
+
+    async def chat_completion(
+        self,
+        model: str,
+        messages: List[Message],
+        sampling_params: Optional[SamplingParams] = SamplingParams(),
+        tools: Optional[List[ToolDefinition]] = None,
+        tool_choice: Optional[ToolChoice] = ToolChoice.auto,
+        tool_prompt_format: Optional[ToolPromptFormat] = ToolPromptFormat.json,
+        stream: Optional[bool] = False,
+        logprobs: Optional[LogProbConfig] = None,
+    ) -> AsyncGenerator:
+        request = ChatCompletionRequest(
+            model=model,
+            messages=messages,
+            sampling_params=sampling_params,
+            tools=tools or [],
+            tool_choice=tool_choice,
+            tool_prompt_format=tool_prompt_format,
+            stream=stream,
+            logprobs=logprobs,
+        )
+
+        messages = augment_messages_for_tools(request)
+        options = self.get_databricks_chat_options(request)
+        databricks_model = self.resolve_databricks_model(request.model)
+
+        if not request.stream:
+
+            r = self.client.chat.completions.create(
+                model=databricks_model,
+                messages=self._messages_to_databricks_messages(messages),
+                stream=False,
+                **options,
+            )
+
+            stop_reason = None
+            if r.choices[0].finish_reason:
+                if r.choices[0].finish_reason == "stop":
+                    stop_reason = StopReason.end_of_turn
+                elif r.choices[0].finish_reason == "length":
+                    stop_reason = StopReason.out_of_tokens
+
+            completion_message = self.formatter.decode_assistant_message_from_content(
+                r.choices[0].message.content, stop_reason
+            )
+            yield ChatCompletionResponse(
+                completion_message=completion_message,
+                logprobs=None,
+            )
+        else:
+            yield ChatCompletionResponseStreamChunk(
+                event=ChatCompletionResponseEvent(
+                    event_type=ChatCompletionResponseEventType.start,
+                    delta="",
+                )
+            )
+
+            buffer = ""
+            ipython = False
+            stop_reason = None
+
+            for chunk in self.client.chat.completions.create(
+                model=databricks_model,
+                messages=self._messages_to_databricks_messages(messages),
+                stream=True,
+                **options,
+            ):
+                if chunk.choices[0].finish_reason:
+                    if (
+                        stop_reason is None
+                        and chunk.choices[0].finish_reason == "stop"
+                    ):
+                        stop_reason = StopReason.end_of_turn
+                    elif (
+                        stop_reason is None
+                        and chunk.choices[0].finish_reason == "length"
+                    ):
+                        stop_reason = StopReason.out_of_tokens
+                    break
+
+                text = chunk.choices[0].delta.content
+
+                if text is None:
+                    continue
+
+                # check if its a tool call ( aka starts with <|python_tag|> )
+                if not ipython and text.startswith("<|python_tag|>"):
+                    ipython = True
+                    yield ChatCompletionResponseStreamChunk(
+                        event=ChatCompletionResponseEvent(
+                            event_type=ChatCompletionResponseEventType.progress,
+                            delta=ToolCallDelta(
+                                content="",
+                                parse_status=ToolCallParseStatus.started,
+                            ),
+                        )
+                    )
+                    buffer += text
+                    continue
+
+                if ipython:
+                    if text == "<|eot_id|>":
+                        stop_reason = StopReason.end_of_turn
+                        text = ""
+                        continue
+                    elif text == "<|eom_id|>":
+                        stop_reason = StopReason.end_of_message
+                        text = ""
+                        continue
+
+                    buffer += text
+                    delta = ToolCallDelta(
+                        content=text,
+                        parse_status=ToolCallParseStatus.in_progress,
+                    )
+
+                    yield ChatCompletionResponseStreamChunk(
+                        event=ChatCompletionResponseEvent(
+                            event_type=ChatCompletionResponseEventType.progress,
+                            delta=delta,
+                            stop_reason=stop_reason,
+                        )
+                    )
+                else:
+                    buffer += text
+                    yield ChatCompletionResponseStreamChunk(
+                        event=ChatCompletionResponseEvent(
+                            event_type=ChatCompletionResponseEventType.progress,
+                            delta=text,
+                            stop_reason=stop_reason,
+                        )
+                    )
+
+            # parse tool calls and report errors
+            message = self.formatter.decode_assistant_message_from_content(
+                buffer, stop_reason
+            )
+            parsed_tool_calls = len(message.tool_calls) > 0
+            if ipython and not parsed_tool_calls:
+                yield ChatCompletionResponseStreamChunk(
+                    event=ChatCompletionResponseEvent(
+                        event_type=ChatCompletionResponseEventType.progress,
+                        delta=ToolCallDelta(
+                            content="",
+                            parse_status=ToolCallParseStatus.failure,
+                        ),
+                        stop_reason=stop_reason,
+                    )
+                )
+
+            for tool_call in message.tool_calls:
+                yield ChatCompletionResponseStreamChunk(
+                    event=ChatCompletionResponseEvent(
+                        event_type=ChatCompletionResponseEventType.progress,
+                        delta=ToolCallDelta(
+                            content=tool_call,
+                            parse_status=ToolCallParseStatus.success,
+                        ),
+                        stop_reason=stop_reason,
+                    )
+                )
+
+            yield ChatCompletionResponseStreamChunk(
+                event=ChatCompletionResponseEvent(
+                    event_type=ChatCompletionResponseEventType.complete,
+                    delta="",
+                    stop_reason=stop_reason,
+                )
+            )

llama_stack/providers/registry/inference.py

@@ -104,6 +104,17 @@ def available_providers() -> List[ProviderSpec]:
                 config_class="llama_stack.providers.adapters.inference.bedrock.BedrockConfig",
             ),
         ),
+        remote_provider_spec(
+            api=Api.inference,
+            adapter=AdapterSpec(
+                adapter_type="databricks",
+                pip_packages=[
+                    "openai",
+                ],
+                module="llama_stack.providers.adapters.inference.databricks",
+                config_class="llama_stack.providers.adapters.inference.databricks.DatabricksImplConfig",
+            ),
+        ),
         InlineProviderSpec(
             api=Api.inference,
             provider_type="vllm",