```
You can also download safety models from HF
```
llama download --source huggingface --model-id Llama-Guard-3-8B --ignore-patterns *original*
```
```
llama download --source huggingface --model-id Prompt-Guard-86M --ignore-patterns *original*
```
## Step 2: Understand the models
The `llama model` command helps you explore the model’s interface.
```
llama model --help
```
usage: llama model [-h] {download,list,template,describe} ...
Work with llama models
options:
-h, --help show this help message and exit
model_subcommands:
{download,list,template,describe}
You can use the describe command to know more about a model:
```
llama model describe -m Meta-Llama3.1-8B-Instruct
```
+-----------------------------+---------------------------------------+
| Model | Meta- |
| | Llama3.1-8B-Instruct |
+-----------------------------+---------------------------------------+
| HuggingFace ID | meta-llama/Meta-Llama-3.1-8B-Instruct |
+-----------------------------+---------------------------------------+
| Description | Llama 3.1 8b instruct model |
+-----------------------------+---------------------------------------+
| Context Length | 128K tokens |
+-----------------------------+---------------------------------------+
| Weights format | bf16 |
+-----------------------------+---------------------------------------+
| Model params.json | { |
| | "dim": 4096, |
| | "n_layers": 32, |
| | "n_heads": 32, |
| | "n_kv_heads": 8, |
| | "vocab_size": 128256, |
| | "ffn_dim_multiplier": 1.3, |
| | "multiple_of": 1024, |
| | "norm_eps": 1e-05, |
| | "rope_theta": 500000.0, |
| | "use_scaled_rope": true |
| | } |
+-----------------------------+---------------------------------------+
| Recommended sampling params | { |
| | "strategy": "top_p", |
| | "temperature": 1.0, |
| | "top_p": 0.9, |
| | "top_k": 0 |
| | } |
+-----------------------------+---------------------------------------+
You can even run `llama model template` see all of the templates and their tokens:
```
llama model template
```
+-----------+---------------------------------+
| Role | Template Name |
+-----------+---------------------------------+
| user | user-default |
| assistant | assistant-builtin-tool-call |
| assistant | assistant-custom-tool-call |
| assistant | assistant-default |
| system | system-builtin-and-custom-tools |
| system | system-builtin-tools-only |
| system | system-custom-tools-only |
| system | system-default |
| tool | tool-success |
| tool | tool-failure |
+-----------+---------------------------------+
And fetch an example by passing it to `--name`:
```
llama model template --name tool-success
```
+----------+----------------------------------------------------------------+
| Name | tool-success |
+----------+----------------------------------------------------------------+
| Template | <|start_header_id|>ipython<|end_header_id|> |
| | |
| | completed |
| | [stdout]{"results":["something |
| | something"]}[/stdout]<|eot_id|> |
| | |
+----------+----------------------------------------------------------------+
| Notes | Note ipython header and [stdout] |
+----------+----------------------------------------------------------------+
Or:
```
llama model template --name system-builtin-tools-only
```
+----------+--------------------------------------------+
| Name | system-builtin-tools-only |
+----------+--------------------------------------------+
| Template | <|start_header_id|>system<|end_header_id|> |
| | |
| | Environment: ipython |
| | Tools: brave_search, wolfram_alpha |
| | |
| | Cutting Knowledge Date: December 2023 |
| | Today Date: 21 August 2024 |
| | <|eot_id|> |
| | |
+----------+--------------------------------------------+
| Notes | |
+----------+--------------------------------------------+
These commands can help understand the model interface and how prompts / messages are formatted for various scenarios.
**NOTE**: Outputs in terminal are color printed to show special tokens.
## Step 3: Installing and Configuring Distributions
An agentic app has several components including model inference, tool execution and system safety shields. Running all these components is made simpler (we hope!) with Llama Stack Distributions.
A Distribution is simply a collection of REST API providers that are part of the Llama stack. As an example, by running a simple command `llama distribution start`, you can bring up a server serving the following endpoints, among others:
```
POST /inference/chat_completion
POST /inference/completion
POST /safety/run_shields
POST /agentic_system/create
POST /agentic_system/session/create
POST /agentic_system/turn/create
POST /agentic_system/delete
```
The agentic app can now simply point to this server to execute all its needed components.
A distribution’s behavior can be configured by defining a specification or “spec”. This specification lays out the different API “Providers” that constitute this distribution.
Lets install, configure and start a distribution to understand more !
Let’s start with listing available distributions
```
llama distribution list
```
+--------------+---------------------------------------------+----------------------------------------------------------------------+
| Spec ID | ProviderSpecs | Description |
+--------------+---------------------------------------------+----------------------------------------------------------------------+
| local | { | Use code from `llama_toolchain` itself to serve all llama stack APIs |
| | "inference": "meta-reference", | |
| | "safety": "meta-reference", | |
| | "agentic_system": "meta-reference" | |
| | } | |
+--------------+---------------------------------------------+----------------------------------------------------------------------+
| remote | { | Point to remote services for all llama stack APIs |
| | "inference": "inference-remote", | |
| | "safety": "safety-remote", | |
| | "agentic_system": "agentic_system-remote" | |
| | } | |
+--------------+---------------------------------------------+----------------------------------------------------------------------+
| local-ollama | { | Like local, but use ollama for running LLM inference |
| | "inference": "meta-ollama", | |
| | "safety": "meta-reference", | |
| | "agentic_system": "meta-reference" | |
| | } | |
+--------------+---------------------------------------------+----------------------------------------------------------------------+
As you can see above, each “spec” details the “providers” that make up that spec. For eg. The `local` spec uses the “meta-reference” provider for inference while the `local-ollama` spec relies on a different provider ( ollama ) for inference.
Lets install the fully local implementation of the llama-stack – named `local` above.
To install a distro, we run a simple command providing 2 inputs –
- **Spec Id** of the distribution that we want to install ( as obtained from the list command )
- A **Name** by which this installation will be known locally.
```
llama distribution install --spec local --name local_llama_8b
```
This will create a new conda environment (name can be passed optionally) and install dependencies (via pip) as required by the distro.
Once it runs successfully , you should see some outputs in the form
```
llama distribution install --spec local --name local_llama_8b
```
Successfully installed cfgv-3.4.0 distlib-0.3.8 identify-2.6.0 libcst-1.4.0 llama_toolchain-0.0.2 moreorless-0.4.0 nodeenv-1.9.1 pre-commit-3.8.0 stdlibs-2024.5.15 toml-0.10.2 tomlkit-0.13.0 trailrunner-1.4.0 ufmt-2.7.0 usort-1.0.8 virtualenv-20.26.3
Distribution `local_llama_8b` (with spec local) has been installed successfully!
Next step is to configure the distribution that you just installed. We provide a simple CLI tool to enable simple configuration.
This command will walk you through the configuration process.
It will ask for some details like model name, paths to models, etc.
**NOTE**: You will have to download the models if not done already. Follow instructions here on how to download using the llama cli
```
llama distribution configure --name local_llama_8b
```
Here is an example output of how the cli will guide you to fill the configuration:
Configuring API surface: inference
Enter value for model (required): Meta-Llama3.1-8B-Instruct
Enter value for quantization (optional):
Enter value for torch_seed (optional):
Enter value for max_seq_len (required): 4096
Enter value for max_batch_size (default: 1): 1
Configuring API surface: safety
Do you want to configure llama_guard_shield? (y/n): n
Do you want to configure prompt_guard_shield? (y/n): n
Configuring API surface: agentic_system
YAML configuration has been written to ~/.llama/distributions/local0/config.yaml
As you can see, we did basic configuration above and configured inference to run on model Meta-Llama3.1-8B-Instruct ( obtained from the llama model list command ).
For this initial setup we did not set up safety.
For how these configurations are stored as yaml, checkout the file printed at the end of the configuration.
## Step 4: Starting a Distribution and Testing it
Now let’s start the distribution using the cli.
```
llama distribution start --name local_llama_8b --port 5000
```
You should see the distribution start and print the APIs that it is supporting:
> initializing model parallel with size 1
> initializing ddp with size 1
> initializing pipeline with size 1
Loaded in 19.28 seconds
NCCL version 2.20.5+cuda12.4
Finished model load YES READY
Serving POST /inference/batch_chat_completion
Serving POST /inference/batch_completion
Serving POST /inference/chat_completion
Serving POST /inference/completion
Serving POST /safety/run_shields
Serving POST /agentic_system/memory_bank/attach
Serving POST /agentic_system/create
Serving POST /agentic_system/session/create
Serving POST /agentic_system/turn/create
Serving POST /agentic_system/delete
Serving POST /agentic_system/session/delete
Serving POST /agentic_system/memory_bank/detach
Serving POST /agentic_system/session/get
Serving POST /agentic_system/step/get
Serving POST /agentic_system/turn/get
Listening on :::5000
INFO: Started server process [453333]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://[::]:5000 (Press CTRL+C to quit)
Lets test with a client
```
cd /path/to/llama-toolchain
conda activate # ( Eg. local_llama_8b in above example )
python -m llama_toolchain.inference.client localhost 5000
```
This will run the chat completion client and query the distribution’s /inference/chat_completion API.
Here is an example output:
Initializing client for http://localhost:5000
User>hello world, troll me in two-paragraphs about 42
Assistant> You think you're so smart, don't you? You think you can just waltz in here and ask about 42, like it's some kind of trivial matter. Well, let me tell you, 42 is not just a number, it's a way of life. It's the answer to the ultimate question of life, the universe, and everything, according to Douglas Adams' magnum opus, "The Hitchhiker's Guide to the Galaxy". But do you know what's even more interesting about 42? It's that it's not actually the answer to anything, it's just a number that some guy made up to sound profound.
You know what's even more hilarious? People like you who think they can just Google "42" and suddenly become experts on the subject. Newsflash: you're not a supercomputer, you're just a human being with a fragile ego and a penchant for thinking you're smarter than you actually are. 42 is just a number, a meaningless collection of digits that holds no significance whatsoever. So go ahead, keep thinking you're so clever, but deep down, you're just a pawn in the grand game of life, and 42 is just a silly little number that's been used to make you feel like you're part of something bigger than yourself. Ha!
Similarly you can test safety (if you configured llama-guard and/or prompt-guard shields) by:
```
python -m llama_toolchain.safety.client localhost 5000
```