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feat: NVIDIA allow non-llama model registration (#1859)

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# What does this PR do?
Adds custom model registration functionality to NVIDIAInferenceAdapter
which let's the inference happen on:
- post-training model
- non-llama models in API Catalogue(behind
https://integrate.api.nvidia.com and endpoints compatible with
AyncOpenAI)

## Example Usage:
```python
from llama_stack.apis.models import Model, ModelType
from llama_stack.distribution.library_client import LlamaStackAsLibraryClient
client = LlamaStackAsLibraryClient("nvidia")
_ = client.initialize()

client.models.register(
        model_id=model_name,
        model_type=ModelType.llm,
        provider_id="nvidia"
)

response = client.inference.chat_completion(
    model_id=model_name,
    messages=[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"Write a limerick about the wonders of GPU computing."}],
)
```

## Test Plan
```bash
pytest tests/unit/providers/nvidia/test_supervised_fine_tuning.py 
========================================================== test session starts ===========================================================
platform linux -- Python 3.10.0, pytest-8.3.5, pluggy-1.5.0
rootdir: /home/ubuntu/llama-stack
configfile: pyproject.toml
plugins: anyio-4.9.0
collected 6 items                                                                                                                        

tests/unit/providers/nvidia/test_supervised_fine_tuning.py ......                                                                  [100%]

============================================================ warnings summary ============================================================
../miniconda/envs/nvidia-1/lib/python3.10/site-packages/pydantic/fields.py:1076
  /home/ubuntu/miniconda/envs/nvidia-1/lib/python3.10/site-packages/pydantic/fields.py:1076: PydanticDeprecatedSince20: Using extra keyword arguments on `Field` is deprecated and will be removed. Use `json_schema_extra` instead. (Extra keys: 'contentEncoding'). Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.11/migration/
    warn(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
====================================================== 6 passed, 1 warning in 1.51s ======================================================
```

[//]: # (## Documentation)
Updated Readme.md

cc: @dglogo, @sumitb, @mattf
This commit is contained in:
Rashmi Pawar 2025-04-25 05:43:33 +05:30 • committed by GitHub
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5
llama_stack/providers/remote/inference/nvidia/config.py
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@ -47,10 +47,15 @@ class NVIDIAConfig(BaseModel):
default=60,
description="Timeout for the HTTP requests",
)
append_api_version: bool = Field(
default_factory=lambda: os.getenv("NVIDIA_APPEND_API_VERSION", "True").lower() != "false",
description="When set to false, the API version will not be appended to the base_url. By default, it is true.",
)
@classmethod
def sample_run_config(cls, **kwargs) -> Dict[str, Any]:
return {
"url": "${env.NVIDIA_BASE_URL:https://integrate.api.nvidia.com}",
"api_key": "${env.NVIDIA_API_KEY:}",
"append_api_version": "${env.NVIDIA_APPEND_API_VERSION:True}",
}