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fix dropped tokens in ReActAgentWorker._arun_step_stream #14308

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Tshimanga
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@Tshimanga Tshimanga commented Jun 22, 2024

Description

The ReActAgentWorker._arun_step_stream method drops any tokens generated before the is_done condition triggers.

Fixes #14307

New Package?

Did I fill in the tool.llamahub section in the pyproject.toml and provide a detailed README.md for my new integration or package?

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Version Bump?

Did I bump the version in the pyproject.toml file of the package I am updating? (Except for the llama-index-core package)

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Type of Change

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  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

  • Added new unit/integration tests
  • Added new notebook (that tests end-to-end)
  • I stared at the code and made sure it makes sense

Suggested Checklist:

  • I have performed a self-review of my own code
  • I have commented my code, particularly in hard-to-understand areas
  • I have made corresponding changes to the documentation
  • I have added Google Colab support for the newly added notebooks.
  • My changes generate no new warnings
  • I have added tests that prove my fix is effective or that my feature works
  • New and existing unit tests pass locally with my changes
  • I ran make format; make lint to appease the lint gods

@dosubot dosubot bot added the size:XS This PR changes 0-9 lines, ignoring generated files. label Jun 22, 2024
@Tshimanga Tshimanga changed the title patch the dropped token issue fix dropped tokens in ReActAgentWorker._arun_step_stream Jun 22, 2024
)
is_done = False
async for latest_chunk in chat_stream:
full_response = latest_chunk
is_done = self._infer_stream_chunk_is_final(latest_chunk)
if is_done:
full_response.delta = full_response.message.content
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I'm kind of confused what's happening here

The delta should only have the newest tokens from the stream, not the entire response?

I haven't noticed issues with the react agent dropping tokens, can you give some example that shows the issue?

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tl;dr there was a bit of nuance I missed in debugging the issue. Responded here with more detail/context
#14307 (comment)

@logan-markewich
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Closing in favour of #14587

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[Bug]: ReActAgentWorker._arun_step_stream drops tokens that arrive before is_done=True
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