Commits on Oct 10, 2024

1. Fix streaming functionality with Bedrock guardrails (langchain-ai#176) ( …

   langchain-ai#177)
   
   This PR addresses an issue where the streaming functionality in
   ChatBedrock breaks when Bedrock guardrails are applied. The problem was
   caused by a KeyError in the `_stream_response_to_generation_chunk`
   method when trying to access the 'stop_sequence' key, which may not
   always be present in the response structure when guardrails are active.
   
   ## Changes
   - Modified the `_stream_response_to_generation_chunk` method in
   `llms/bedrock.py` to use the `get()` method when accessing dictionary
   keys that may not always be present.
   
   
   ## Testing
   - Tested the streaming functionality with and without Bedrock guardrails
   applied.
   - Verified that the streaming works correctly in both scenarios without
   raising KeyErrors.

   

   ardf committed Oct 10, 2024
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