Add Langchain Pandas DataFrame Agent

[MarcSkovMadsen]

Addresses #79

Todo

• [x] Implement POC
• [x] Add .csv file to download in "Welcome" message.
• [x] Remove rerun, undo and clear buttons
• [x] Add tests
• [x] Create video and thumbnail
• [x] Add docstring
• [x] Add option to use PanelCallbackHandler to better understand what goes on.

Won't do now. Maybe one day someone will.

• [ ] Add options to configure llm and or pandas agent.
• [ ] Add Reset All button. See https://github.com/holoviz/panel/issues/5711

Related issues

• https://github.com/holoviz/panel/issues/5709
• https://github.com/holoviz/panel/issues/5708
• https://github.com/holoviz/panel/issues/5707
• https://github.com/holoviz/panel/issues/5705
• https://github.com/holoviz/panel/issues/5711

https://github.com/holoviz-topics/panel-chat-examples/assets/42288570/63f53cec-319b-4376-a962-7b13716d66b8

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2b801a4) 78.88% compared to head (8903405) 78.88%. Report is 8 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #83 +/- ## ======================================= Coverage 78.88% 78.88% ======================================= Files 5 5 Lines 161 161 ======================================= Hits 127 127 Misses 34 34 ```

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[MarcSkovMadsen]

Thanks for the feedback @ahuang11 . I've implemented the changes. Let me know if there is more I should do?

[ahuang11]

I encounter some issues (duplicates using show chain of thought) using https://github.com/holoviz/panel/pull/5710/files; I'm not sure if it's related to the branch or this.

[MarcSkovMadsen]

I encounter some issues (duplicates using show chain of thought) using https://github.com/holoviz/panel/pull/5710/files; I'm not sure if it's related to the branch or this.

How can I reproduce this? I see the exception at the top, but does not know the steps you applied to get to that?

[ahuang11]

Thanks for adding this example!

[ahuang11]

I encounter some issues (duplicates using show chain of thought) using https://github.com/holoviz/panel/pull/5710/files; I'm not sure if it's related to the branch or this.

How can I reproduce this? I see the exception at the top, but does not know the steps you applied to get to that?

I believe I just copied the text from the sample query provided.