Revert LiteLLM Router-based retries and upgrade poetry lock for litel…

…lm 1.51.0 (#1762)

* Revert LiteLLM Router-based retries and upgrade poetry lock for litellm 1.51.0

* Temporarily remove retry tests

* fix test

dspy/clients/lm.py

@@ -1,21 +1,19 @@
 import functools
+from .base_lm import BaseLM
 import logging
 import os
 import uuid
 from concurrent.futures import ThreadPoolExecutor
-from dataclasses import dataclass
 from datetime import datetime
 from typing import Any, Dict, List, Literal, Optional
 
+import litellm
 import ujson
-from litellm import Router
-from litellm.router import RetryPolicy
 
 from dspy.clients.finetune import FinetuneJob, TrainingMethod
 from dspy.clients.lm_finetune_utils import execute_finetune_job, get_provider_finetune_job_class
 from dspy.utils.callback import BaseCallback, with_callbacks
 
-from .base_lm import BaseLM
 
 logger = logging.getLogger(__name__)
 
@@ -34,7 +32,7 @@ def __init__(
         cache: bool = True,
         launch_kwargs: Optional[Dict[str, Any]] = None,
         callbacks: Optional[List[BaseCallback]] = None,
-        num_retries: int = 8,
+        num_retries: int = 3,
         **kwargs,
     ):
         """
@@ -165,55 +163,6 @@ def copy(self, **kwargs):
         return new_instance
 
 
-@dataclass(frozen=True)
-class _ProviderAPIConfig:
-    """
-    API configurations for a provider (e.g. OpenAI, Azure OpenAI)
-    """
-
-    api_key: Optional[str]
-    api_base: Optional[str]
-    api_version: Optional[str]
-    # Azure OpenAI with Azure AD auth requires an Azure AD token for authentication.
-    # For all other providers, this field is empty
-    azure_ad_token: Optional[str]
-
-
-def _extract_provider_api_config(model: str, llm_kwargs: Dict[str, Any]) -> _ProviderAPIConfig:
-    """
-    Extract the API configurations from the specified LLM keyword arguments (`llm_kwargs`) for the
-    provider corresponding to the given model.
-
-    Note: The API configurations are removed from the specified `llm_kwargs`, if present, mutating
-    the input dictionary.
-    """
-    provider = _get_provider(model)
-    api_key = llm_kwargs.pop("api_key", None) or os.getenv(f"{provider.upper()}_API_KEY")
-    api_base = llm_kwargs.pop("api_base", None) or os.getenv(f"{provider.upper()}_API_BASE")
-    api_version = llm_kwargs.pop("api_version", None) or os.getenv(f"{provider.upper()}_API_VERSION")
-    if "azure" in provider:
-        azure_ad_token = llm_kwargs.pop("azure_ad_token", None) or os.getenv("AZURE_AD_TOKEN")
-    else:
-        azure_ad_token = None
-    return _ProviderAPIConfig(
-        api_key=api_key,
-        api_base=api_base,
-        api_version=api_version,
-        azure_ad_token=azure_ad_token,
-    )
-
-
-def _get_provider(model: str) -> str:
-    """
-    Extract the provider name from the model string of the format "<provider_name>/<model_name>",
-    e.g. "openai/gpt-4".
-
-    TODO: Not all the models are in the format of "provider/model"
-    """
-    model = model.split("/", 1)
-    return model[0] if len(model) > 1 else "openai"
-
-
 @functools.lru_cache(maxsize=None)
 def cached_litellm_completion(request, num_retries: int):
     return litellm_completion(
@@ -225,69 +174,13 @@ def cached_litellm_completion(request, num_retries: int):
 
 def litellm_completion(request, num_retries: int, cache={"no-cache": True, "no-store": True}):
     kwargs = ujson.loads(request)
-    api_config = _extract_provider_api_config(model=kwargs["model"], llm_kwargs=kwargs)
-    router = _get_litellm_router(model=kwargs["model"], num_retries=num_retries, api_config=api_config)
-    return router.completion(
+    return litellm.completion(
+        num_retries=num_retries,
         cache=cache,
         **kwargs,
     )
 
 
-@functools.lru_cache(maxsize=None)
-def _get_litellm_router(model: str, num_retries: int, api_config: _ProviderAPIConfig) -> Router:
-    """
-    Get a LiteLLM router for the given model with the specified number of retries
-    for transient errors.
-
-    Args:
-        model: The name of the LiteLLM model to query (e.g. 'openai/gpt-4').
-        num_retries: The number of times to retry a request if it fails transiently due to
-                     network error, rate limiting, etc. Requests are retried with exponential
-                     backoff.
-        api_config: The API configurations (keys, base URL, etc.) for the provider
-                    (OpenAI, Azure OpenAI, etc.) corresponding to the given model.
-
-    Returns:
-        A LiteLLM router instance that can be used to query the given model.
-    """
-    retry_policy = RetryPolicy(
-        TimeoutErrorRetries=num_retries,
-        RateLimitErrorRetries=num_retries,
-        InternalServerErrorRetries=num_retries,
-        # We don't retry on errors that are unlikely to be transient
-        # (e.g. bad request, invalid auth credentials)
-        BadRequestErrorRetries=0,
-        AuthenticationErrorRetries=0,
-        ContentPolicyViolationErrorRetries=0,
-    )
-
-    # LiteLLM routers must specify a `model_list`, which maps model names passed
-    # to `completions()` into actual LiteLLM model names. For our purposes, the
-    # model name is the same as the LiteLLM model name, so we add a single
-    # entry to the `model_list` that maps the model name to itself
-    litellm_params = {
-        "model": model,
-    }
-    if api_config.api_key is not None:
-        litellm_params["api_key"] = api_config.api_key
-    if api_config.api_base is not None:
-        litellm_params["api_base"] = api_config.api_base
-    if api_config.api_version is not None:
-        litellm_params["api_version"] = api_config.api_version
-    if api_config.azure_ad_token is not None:
-        litellm_params["azure_ad_token"] = api_config.azure_ad_token
-    model_list = [
-        {
-            "model_name": model,
-            "litellm_params": litellm_params,
-        }
-    ]
-    return Router(
-        model_list=model_list,
-        retry_policy=retry_policy,
-    )
-
-
 @functools.lru_cache(maxsize=None)
 def cached_litellm_text_completion(request, num_retries: int):
     return litellm_text_completion(
@@ -299,18 +192,25 @@ def cached_litellm_text_completion(request, num_retries: int):
 
 def litellm_text_completion(request, num_retries: int, cache={"no-cache": True, "no-store": True}):
     kwargs = ujson.loads(request)
-    model = kwargs.pop("model")
-    api_config = _extract_provider_api_config(model=model, llm_kwargs=kwargs)
-    model_name = model.split("/", 1)[-1]
-    text_completion_model_name = f"text-completion-openai/{model_name}"
+
+    # Extract the provider and model from the model string.
+    # TODO: Not all the models are in the format of "provider/model"
+    model = kwargs.pop("model").split("/", 1)
+    provider, model = model[0] if len(model) > 1 else "openai", model[-1]
+
+    # Use the API key and base from the kwargs, or from the environment.
+    api_key = kwargs.pop("api_key", None) or os.getenv(f"{provider}_API_KEY")
+    api_base = kwargs.pop("api_base", None) or os.getenv(f"{provider}_API_BASE")
 
     # Build the prompt from the messages.
     prompt = "\n\n".join([x["content"] for x in kwargs.pop("messages")] + ["BEGIN RESPONSE:"])
 
-    router = _get_litellm_router(model=text_completion_model_name, num_retries=num_retries, api_config=api_config)
-    return router.text_completion(
+    return litellm.text_completion(
         cache=cache,
-        model=text_completion_model_name,
+        model=f"text-completion-openai/{model}",
+        api_key=api_key,
+        api_base=api_base,
         prompt=prompt,
+        num_retries=num_retries,
         **kwargs,
     )