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SGLangModel

SGLang service interface. Parameters:
  • model_type (Union[ModelType, str]): Model for which a backend is created.
  • model_config_dict (Optional[Dict[str, Any]], optional): A dictionary that will be fed into:obj:openai.ChatCompletion.create(). If :obj:None, :obj:SGLangConfig().as_dict() will be used. (default: :obj:None)
  • api_key (Optional[str], optional): The API key for authenticating with the model service. SGLang doesn’t need API key, it would be ignored if set. (default: :obj:None)
  • url (Optional[str], optional): The url to the model service. If not provided, :obj:"http://127.0.0.1:30000/v1" will be used. (default: :obj:None)
  • token_counter (Optional[BaseTokenCounter], optional): Token counter to use for the model. If not provided, :obj:OpenAITokenCounter( ModelType.GPT_4O_MINI) will be used. (default: :obj:None)
  • timeout (Optional[float], optional): The timeout value in seconds for API calls. If not provided, will fall back to the MODEL_TIMEOUT environment variable or default to 180 seconds. (default: :obj:None)
  • max_retries (int, optional): Maximum number of retries for API calls. (default: :obj:3)
  • client (Optional[Any], optional): A custom synchronous OpenAI-compatible client instance. If provided, this client will be used instead of creating a new one. Note: When using custom clients with SGLang, server auto-start features will be disabled. (default: :obj:None)
  • async_client (Optional[Any], optional): A custom asynchronous OpenAI-compatible client instance. If provided, this client will be used instead of creating a new one. (default: :obj:None) **kwargs (Any): Additional arguments to pass to the client initialization. Ignored if custom clients are provided.
  • Reference: https://sgl-project.github.io/backend/openai_api_completions. html

init

_start_server

_ensure_server_running

Ensures that the server is running. If not, starts the server.

_monitor_inactivity

Monitor whether the server process has been inactive for over 10 minutes.

token_counter

Returns: BaseTokenCounter: The token counter following the model’s tokenization style.

_run

Runs inference of OpenAI chat completion. Parameters:
  • messages (List[OpenAIMessage]): Message list with the chat history in OpenAI API format.
Returns: Union[ChatCompletion, Stream[ChatCompletionChunk]]: ChatCompletion in the non-stream mode, or Stream[ChatCompletionChunk] in the stream mode.

stream

Returns: bool: Whether the model is in stream mode.

del

Properly clean up resources when the model is destroyed.

cleanup

Terminate the server process and clean up resources.

_terminate_process

_kill_process_tree

Kill the process and all its child processes.

_execute_shell_command

Execute a shell command and return the process handle Parameters:
  • command: Shell command as a string (can include \ line continuations)
Returns: subprocess.Popen: Process handle

_wait_for_server

Wait for the server to be ready by polling the /v1/models endpoint. Parameters:
  • base_url (str): The base URL of the server
  • timeout (Optional[float]): Maximum time to wait in seconds. (default: :obj:30)