transformers

a69e1850 - add doctests for bart like seq2seq models (#15987)

add doctests for bart like seq2seq models (#15987) * boom boom * enable doctest for few seq2seq models * add seq2seq models in documentation_tests.txt * fix docstring blenderbot * Apply suggestions from code review Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com> * Apply suggestions from code review Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com> * fix seq classif doc sample * don't check loss for seq classif examples * +IGNORE_OUTPUT => +IGNORE_RESULT * fix _SEQ_CLASS_EXPECTED_OUTPUT_SHAPE * fix some docs * more fixes * last fix (hopefully) * fix big bird gen example * fix mbart gen example Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>