feat(tokenizer):add support for open source llm tokenizers

[Halpph]

Hello everyone, I saw the Contribute guide but for some reason the tests would always fail on _____________________________________ ERROR collecting test/test_function_utils.py _____________________________________ test/test_function_utils.py:288: in <module> class Currency(BaseModel): pydantic/main.py:197: in pydantic.main.ModelMetaclass.__new__ ??? pydantic/fields.py:497: in pydantic.fields.ModelField.infer ??? pydantic/fields.py:469: in pydantic.fields.ModelField._get_field_info ??? E ValueError: Fielddefault cannot be set inAnnotated for 'amount'

I tried but I'm very busy and I seem to not manage to make it work for now, I hope you can take a look and I'll try to run it again.

Why are these changes needed?

This PR solves the following issue https://github.com/microsoft/autogen/issues/1666
Basically while serving open source llm models we were always tokenizing using cl100k_base, but now we support the native way of each model by specifying it in the OAI_CONFIG_LIST

Related issue number

Closes #1666

Checks

Sadly I didn't manage to run checks because of the error mentioned above

[Halpph]

@microsoft-github-policy-service agree

[codecov-commenter]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (aea5bed) 39.62% compared to head (a842f46) 15.93%.

Files	Patch %	Lines
autogen/token_count_utils.py	27.27%	16 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1701       +/-   ##
===========================================
- Coverage   39.62%   15.93%   -23.70%     
===========================================
  Files          57       57               
  Lines        6006     6024       +18     
  Branches     1338     1457      +119     
===========================================
- Hits         2380      960     -1420     
- Misses       3433     5027     +1594     
+ Partials      193       37      -156     

Flag	Coverage Δ
unittests	15.91% <27.27%> (-23.71%)	⬇️

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[Halpph]

@olgavrou @AaronWard @kevin666aa @SDcodehub

Hello everyone, this is a workaround that I implemented for now in order to be able to continue with my work, but I'd like to discuss with you of a proper implementation before starting the refactoring.
For instance we could implement this using some kind of strategy pattern so that the desired strategy would be responsible for fetching the right tokenizer for each case. What do you think?

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[ekzhu]

@Halpph is this still the workaround you are using?

[Halpph]

I'm not actively using it at the moment, but yes.

[rysweet]

This PR is against AutoGen 0.2. AutoGen 0.2 has been moved to the 0.2 branch. Please rebase your PR on the 0.2 branch or update it to work with the new AutoGen 0.4 that is now in main.

[rysweet]

@Halpph If you can update to resolve conflicts and see if we can get CI to pass we can look at bringing this forward

[rysweet]

closing as stale, please reopen if you would like to bring it up to date.