[Bart] FP16 Support

[sshleifer]

No description provided.

[codecov-io]

Codecov Report

Merging #3145 into master will decrease coverage by 0.06%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3145      +/-   ##
==========================================
- Coverage      78%   77.94%   -0.07%     
==========================================
  Files          98       98              
  Lines       16561    16560       -1     
==========================================
- Hits        12919    12907      -12     
- Misses       3642     3653      +11

Impacted Files	Coverage Δ
src/transformers/modeling_bart.py	93.37% <66.66%> (-0.02%)	⬇️
src/transformers/modeling_tf_pytorch_utils.py	89.93% <0%> (ø)	⬆️
src/transformers/modeling_roberta.py	95.71% <0%> (ø)	⬆️
src/transformers/modeling_tf_utils.py	91.29% <0%> (-2.34%)	⬇️
src/transformers/modeling_xlnet.py	75.77% <0%> (ø)	⬆️
src/transformers/modeling_ctrl.py	98.22% <0%> (ø)	⬆️
src/transformers/modeling_openai.py	81.54% <0%> (ø)	⬆️

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[LysandreJik]

Nice!

[thomwolf]

Awesome, thanks a lot @sshleifer!