docs: standardize OllamaLLM and BaseOpenAI docstrings (#32758)

- Add comprehensive docstring following LangChain standards
- Include Setup, Key init args, Instantiate, Invoke, Stream, and Async
sections
- Provide detailed parameter descriptions and code examples
- Fix linting issues for code formatting compliance

Contributes to #24803

---------

Co-authored-by: Mason Daugherty <github@mdrxy.com>

libs/partners/ollama/langchain_ollama/llms.py

@@ -24,15 +24,93 @@ from ._utils import validate_model
 
 
 class OllamaLLM(BaseLLM):
-    """OllamaLLM large language models.
+    """Ollama large language models.
 
-    Example:
+    Setup:
+        Install ``langchain-ollama`` and install/run the Ollama server locally:
+
+        .. code-block:: bash
+
+            pip install -U langchain-ollama
+            # Visit https://ollama.com/download to download and install Ollama
+            # (Linux users): start the server with ``ollama serve``
+
+        Download a model to use:
+
+        .. code-block:: bash
+
+            ollama pull llama3.1
+
+    Key init args — generation params:
+        model: str
+            Name of the Ollama model to use (e.g. ``'llama4'``).
+        temperature: Optional[float]
+            Sampling temperature. Higher values make output more creative.
+        num_predict: Optional[int]
+            Maximum number of tokens to predict.
+        top_k: Optional[int]
+            Limits the next token selection to the K most probable tokens.
+        top_p: Optional[float]
+            Nucleus sampling parameter. Higher values lead to more diverse text.
+        mirostat: Optional[int]
+            Enable Mirostat sampling for controlling perplexity.
+        seed: Optional[int]
+            Random number seed for generation reproducibility.
+
+    Key init args — client params:
+        base_url: Optional[str]
+            Base URL where Ollama server is hosted.
+        keep_alive: Optional[Union[int, str]]
+            How long the model stays loaded into memory.
+        format: Literal["", "json"]
+            Specify the format of the output.
+
+    See full list of supported init args and their descriptions in the params section.
+
+    Instantiate:
         .. code-block:: python
 
             from langchain_ollama import OllamaLLM
 
-            model = OllamaLLM(model="llama3")
-            print(model.invoke("Come up with 10 names for a song about parrots"))
+            llm = OllamaLLM(
+                model="llama3.1",
+                temperature=0.7,
+                num_predict=256,
+                # base_url="http://localhost:11434",
+                # other params...
+            )
+
+    Invoke:
+        .. code-block:: python
+
+            input_text = "The meaning of life is "
+            response = llm.invoke(input_text)
+            print(response)
+
+        .. code-block:: none
+
+            "a philosophical question that has been contemplated by humans for
+            centuries..."
+
+    Stream:
+        .. code-block:: python
+
+            for chunk in llm.stream(input_text):
+                print(chunk, end="")
+
+        .. code-block:: none
+
+            a philosophical question that has been contemplated by humans for
+            centuries...
+
+    Async:
+        .. code-block:: python
+
+            response = await llm.ainvoke(input_text)
+
+            # stream:
+            # async for chunk in llm.astream(input_text):
+            #     print(chunk, end="")
 
     """
 

libs/partners/openai/langchain_openai/llms/base.py

@@ -49,7 +49,120 @@ def _stream_response_to_generation_chunk(
 
 
 class BaseOpenAI(BaseLLM):
-    """Base OpenAI large language model class."""
+    """Base OpenAI large language model class.
+
+    Setup:
+        Install ``langchain-openai`` and set environment variable ``OPENAI_API_KEY``.
+
+        .. code-block:: bash
+
+            pip install -U langchain-openai
+            export OPENAI_API_KEY="your-api-key"
+
+    Key init args — completion params:
+        model_name: str
+            Name of OpenAI model to use.
+        temperature: float
+            Sampling temperature.
+        max_tokens: int
+            Max number of tokens to generate.
+        top_p: float
+            Total probability mass of tokens to consider at each step.
+        frequency_penalty: float
+            Penalizes repeated tokens according to frequency.
+        presence_penalty: float
+            Penalizes repeated tokens.
+        n: int
+            How many completions to generate for each prompt.
+        best_of: int
+            Generates best_of completions server-side and returns the "best".
+        logit_bias: Optional[dict[str, float]]
+            Adjust the probability of specific tokens being generated.
+        seed: Optional[int]
+            Seed for generation.
+        logprobs: Optional[int]
+            Include the log probabilities on the logprobs most likely output tokens.
+        streaming: bool
+            Whether to stream the results or not.
+
+    Key init args — client params:
+        openai_api_key: Optional[SecretStr]
+            OpenAI API key. If not passed in will be read from env var
+            ``OPENAI_API_KEY``.
+        openai_api_base: Optional[str]
+            Base URL path for API requests, leave blank if not using a proxy or
+            service emulator.
+        openai_organization: Optional[str]
+            OpenAI organization ID. If not passed in will be read from env
+            var ``OPENAI_ORG_ID``.
+        request_timeout: Union[float, tuple[float, float], Any, None]
+            Timeout for requests to OpenAI completion API.
+        max_retries: int
+            Maximum number of retries to make when generating.
+        batch_size: int
+            Batch size to use when passing multiple documents to generate.
+
+    See full list of supported init args and their descriptions in the params section.
+
+    Instantiate:
+        .. code-block:: python
+
+            from langchain_openai.llms.base import BaseOpenAI
+
+            llm = BaseOpenAI(
+                model_name="gpt-3.5-turbo-instruct",
+                temperature=0.7,
+                max_tokens=256,
+                top_p=1,
+                frequency_penalty=0,
+                presence_penalty=0,
+                # openai_api_key="...",
+                # openai_api_base="...",
+                # openai_organization="...",
+                # other params...
+            )
+
+    Invoke:
+        .. code-block:: python
+
+            input_text = "The meaning of life is "
+            response = llm.invoke(input_text)
+            print(response)
+
+        .. code-block:: none
+
+            "a philosophical question that has been debated by thinkers and
+            scholars for centuries."
+
+    Stream:
+        .. code-block:: python
+
+            for chunk in llm.stream(input_text):
+                print(chunk, end="")
+
+        .. code-block:: none
+
+            a philosophical question that has been debated by thinkers and
+            scholars for centuries.
+
+    Async:
+        .. code-block:: python
+
+            response = await llm.ainvoke(input_text)
+
+            # stream:
+            # async for chunk in llm.astream(input_text):
+            #     print(chunk, end="")
+
+            # batch:
+            # await llm.abatch([input_text])
+
+        .. code-block:: none
+
+            "a philosophical question that has been debated by thinkers and
+            scholars for centuries."
+
+    """
 
     client: Any = Field(default=None, exclude=True)  #: :meta private:
     async_client: Any = Field(default=None, exclude=True)  #: :meta private: