Langchain-Replicate integration (max_length issue_
Labels: name: auto:question

### System Info

windows. 

### Who can help?

_No response_

### Information

- [x] The official example notebooks/scripts
- [X] My own modified scripts

### Related Components

- [ ] LLMs/Chat Models
- [ ] Embedding Models
- [ ] Prompts / Prompt Templates / Prompt Selectors
- [ ] Output Parsers
- [ ] Document Loaders
- [ ] Vector Stores / Retrievers
- [ ] Memory
- [ ] Agents / Agent Executors
- [ ] Tools / Toolkits
- [x] Chains
- [ ] Callbacks/Tracing
- [ ] Async

### Reproduction

hello I am trying to use langchain with replicate_python.
https://github.com/replicate/replicate-python

However, I am confused on how to modify the max_new_token for the llm.
To specify

This is a small part of my code.
```
#main.py
llm = Replicate(
    model="joehoover/falcon-40b-instruct:xxxxxxxx",
model_kwargs={ "max_length":1000},
input= { "max_length":1000})
```
I put max_length everywhere and still it isn't reflected.
According to the docs in
https://github.com/hwchase17/langchain/blob/master/langchain/llms/replicate.py
you just need to add the following:
```
  from langchain.llms import Replicate
            replicate = Replicate(model="stability-ai/stable-diffusion: \
                                         27b93a2413e7f36cd83da926f365628\
                                         0b2931564ff050bf9575f1fdf9bcd7478",
                                  input={"image_dimensions": "512x512"})
 ```
However, this method is both outdated and not working.

This is the rest of my code. It is quite identical to this code:
https://github.com/hwchase17/langchain/blob/master/langchain/llms/replicate.py

```
#replicate.py

 
    def _call(
        self,
        prompt: str,
        stop: Optional[List[str]] = None,
        run_manager: Optional[CallbackManagerForLLMRun] = None,
        **kwargs: Any,
    ) -> str:
        """Call to replicate endpoint."""
        try:
            import replicate as replicate_python
        except ImportError:
            raise ImportError(
                "Could not import replicate python package. "
                "Please install it with `pip install replicate`."
            )

        # get the model and version
        model_str, version_str = self.model.split(":")
        model = replicate_python.models.get(model_str)
        version = model.versions.get(version_str)
        # sort through the openapi schema to get the name of the first input
        input_properties = sorted(
            version.openapi_schema["components"]["schemas"]["Input"][
                "properties"
            ].items(),
            key=lambda item: item[1].get("x-order", 0),
        )
        first_input_name = input_properties[0][0]
        print("firstinput",first_input_name)
       
        inputs = {first_input_name: prompt, **self.input}
      

        prediction=replicate_python.predictions.create(version,input={**inputs, **kwargs},kwargs=kwargs)
        print(**kwargs)
        print('status',prediction.status)

        while prediction.status!=  'succeeded':
            prediction.reload()
       
        print('end')
        iterator = replicate_python.run(self.model, input={**inputs, **kwargs})

        print("".join([output for output in iterator]))
        return ''.join(prediction.output)
 ```
The reason i want to change the max_length or the max_new_tokens is because i am providing the llm in replicate with
a lot of context e.g. the ConversationalRetrievalChain workflow.

However, the max_length_ seems to give me truncated response because i have large chunk_sizes that are equivalent or bigger than the default max_length, which is 500.

### Expected behavior

trucated reponse(usually one-two words only) when you have chunks size equivalent or bigger than the size of the default max_token size of the llm. (500) hence i would like to change the token_size but am lost.