Add client_name="langchain" to Cohere usage (#11328)

Hey, we're looking to invest more in adding cohere integrations to
langchain so would love to get more of an idea for how it's used.
Hopefully this pr is acceptable. This week I'm also going to be looking
into adding our new [retrieval augmented generation
product](https://txt.cohere.com/chat-with-rag/) to langchain.

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/langchain/langchain/embeddings/cohere.py

@@ -37,6 +37,8 @@ class CohereEmbeddings(BaseModel, Embeddings):
     """Maximum number of retries to make when generating."""
     request_timeout: Optional[float] = None
     """Timeout in seconds for the Cohere API request."""
+    user_agent: str = "langchain"
+    """Identifier for the application making the request."""
 
     class Config:
         """Configuration for this pydantic object."""
@@ -55,11 +57,18 @@ class CohereEmbeddings(BaseModel, Embeddings):
         try:
             import cohere
 
+            client_name = values["user_agent"]
             values["client"] = cohere.Client(
-                cohere_api_key, max_retries=max_retries, timeout=request_timeout
+                cohere_api_key,
+                max_retries=max_retries,
+                timeout=request_timeout,
+                client_name=client_name,
             )
             values["async_client"] = cohere.AsyncClient(
-                cohere_api_key, max_retries=max_retries, timeout=request_timeout
+                cohere_api_key,
+                max_retries=max_retries,
+                timeout=request_timeout,
+                client_name=client_name,
             )
         except ImportError:
             raise ValueError(

libs/langchain/langchain/llms/cohere.py

@@ -80,6 +80,9 @@ class BaseCohere(Serializable):
     streaming: bool = Field(default=False)
     """Whether to stream the results."""
 
+    user_agent: str = "langchain"
+    """Identifier for the application making the request."""
+
     @root_validator()
     def validate_environment(cls, values: Dict) -> Dict:
         """Validate that api key and python package exists in environment."""
@@ -94,8 +97,11 @@ class BaseCohere(Serializable):
             cohere_api_key = get_from_dict_or_env(
                 values, "cohere_api_key", "COHERE_API_KEY"
             )
-            values["client"] = cohere.Client(cohere_api_key)
-            values["async_client"] = cohere.AsyncClient(cohere_api_key)
+            client_name = values["user_agent"]
+            values["client"] = cohere.Client(cohere_api_key, client_name=client_name)
+            values["async_client"] = cohere.AsyncClient(
+                cohere_api_key, client_name=client_name
+            )
         return values
 
 

libs/langchain/langchain/retrievers/document_compressors/cohere_rerank.py

@@ -30,6 +30,8 @@ class CohereRerank(BaseDocumentCompressor):
     """Model to use for reranking."""
 
     cohere_api_key: Optional[str] = None
+    user_agent: str = "langchain"
+    """Identifier for the application making the request."""
 
     class Config:
         """Configuration for this pydantic object."""
@@ -40,18 +42,18 @@ class CohereRerank(BaseDocumentCompressor):
     @root_validator(pre=True)
     def validate_environment(cls, values: Dict) -> Dict:
         """Validate that api key and python package exists in environment."""
-        cohere_api_key = get_from_dict_or_env(
-            values, "cohere_api_key", "COHERE_API_KEY"
-        )
         try:
             import cohere
-
-            values["client"] = cohere.Client(cohere_api_key)
         except ImportError:
             raise ImportError(
                 "Could not import cohere python package. "
                 "Please install it with `pip install cohere`."
             )
+        cohere_api_key = get_from_dict_or_env(
+            values, "cohere_api_key", "COHERE_API_KEY"
+        )
+        client_name = values["user_agent"]
+        values["client"] = cohere.Client(cohere_api_key, client_name=client_name)
         return values
 
     def compress_documents(