reka model integration

[findalexli]

community: add Reka chat model integration

Description: This PR adds support for the Reka chat model to the LangChain community package. It includes the implementation of ChatReka class, which allows users to interact with Reka's API for chat completions. The integration supports both text and image inputs, streaming responses, and async operations.

Dependencies: This integration inside langchain-community requires the reka-api package to be installed. Users will need to install it separately with pip install reka-api.

Added features:

• ChatReka class for interacting with Reka chat models
• Support for text and image inputs
• Streaming and non-streaming response handling
• Synchronous and asynchronous methods
• Unit and integration tests
• Example notebook demonstrating usage

Testing:

• Unit tests have been added in tests/unit_tests/chat_models/test_reka.py
• Integration tests have been added in tests/integration_tests/chat_models/test_reka.py
• An example notebook has been created in docs/docs/integrations/chat/reka.ipynb

I have run make format, make lint, and make test from the root of the community package, and all checks pass.

X/Twitter handle: @RekaAILabs

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Name	Status	Preview	Comments	Updated (UTC)
langchain	❌ Failed (Inspect)			Oct 10, 2024 11:50pm

[efriis]

hey there! CI is currently failing, and there are merge conflicts. If you close and reopen from a personal branch as outlined here, the maintainers (me) would have access to help!

let me know when CI is passing

[efriis]

closing in favor of #27379 from personal branch