Updated director toxic classifier task (#4701)
Updated director toxic classifier task (#4701)

* Updated director toxic classifier task

* autoformat fixes

* lint errors not captured by autoformat

* Eval-classifier-model-file must be provided to properly use ClassifierMetricTeacher.

Co-authored-by: Leonard Adolphs <073d393368f2c2f4c721574bdcf9995a3a706c98@devfair0791.h2.fair>
facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI