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`anthropic` is an optional library to install but `anthropic_llms.py` is always imported.

Add a way to check if the module is imported or not.

* add anthropic support

* move requirement

* add wip gsm8k yaml

* cleanup tasks dir

* push gsm8k yaml changes

* rename gpt2.py

* add updated gsm8k , triviaqa baseline

* add new cot yaml

* allow for multiple filter pipelines, new filter types

* updated gsm8k + sampling gen configs

* cleanup self-consistency yaml

* Add `TextSynth` API

This reverts commit 5fe7e2c0, reversing
changes made to 14b8ec7e.

- Extract evaluator (still needs work to clean up)
- Add tests for evaluator
- Fix all the things that break on the new tests
- Misc cleanup