Sweep: Ability to Provide Configuration for MaxTokens, etc to Bedrock

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Description

This pull request introduces a new wrapper around Bedrock AI's large language models, enabling users to configure max_tokens, temperature, and other parameters for generating text. It ensures that users can easily integrate Bedrock's capabilities into their projects by setting up a simple configuration and leveraging environment variables for sensitive information like API keys.

Summary

• Added a new file bedrock.py which contains the BedrockLLM class, a wrapper around Bedrock AI APIs.
• The BedrockLLM class allows users to specify a model and configure it using the BedrockProviderConfiguration class for parameters like max_tokens and temperature.
• Environment validation is performed to ensure the bedrock_api_key is available either from the environment or passed explicitly.
• The implementation includes a method _call to interact with Bedrock's generate endpoint, taking into account the provided configuration or default values.
• Proper error handling is in place for missing dependencies, guiding the user to install the required bedrock Python package.
• This addition follows the principles of extensibility and ease of use, adhering to the existing architecture of language model wrappers.

Fixes #310.

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Rollback Files For Sweep

• [ ] Rollback changes to langchain_llms_bedrock.py
• [ ] Rollback changes to bedrock.py

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Sweep: PR Review

bedrock.py

Introduced a new module bedrock.py that provides a wrapper around Bedrock AI APIs, including configuration and interaction with Bedrock AI's large language models.

Sweep Found These Issues

• The validate_environment method does not handle the case where the bedrock_api_key is not found in the environment, potentially leading to an uninitialized client.
https://github.com/tryAGI/LangChain/blob/0d9c309840b143bfcf6b57797134ca0cc292cb14/bedrock.py#L39-L54 [View Diff](https://github.com/tryAGI/LangChain/pull/311/files#diff-9d4b8b7897f26645b252d84321d5f2d776ed564f2d2d9c6afd1aa2e1dcbfaf7cR39-R54)

Potential Issues

Sweep isn't 100% sure if the following are issues or not but they may be worth taking a look at.

• The validate_environment method does not handle the case where the bedrock_api_key is not found in the environment, potentially leading to a KeyError.
https://github.com/tryAGI/LangChain/blob/0d9c309840b143bfcf6b57797134ca0cc292cb14/bedrock.py#L39-L54 [View Diff](https://github.com/tryAGI/LangChain/pull/311/files#diff-9d4b8b7897f26645b252d84321d5f2d776ed564f2d2d9c6afd1aa2e1dcbfaf7cR39-R54)

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