transformers

cfbb9829 - Add DeeBERT (entropy-based early exiting for *BERT) (#5477)

Add DeeBERT (entropy-based early exiting for *BERT) (#5477) * Add deebert code * Add readme of deebert * Add test for deebert Update test for Deebert * Update DeeBert (README, class names, function refactoring); remove requirements.txt * Format update * Update test * Update readme and model init methods