transformers

f867000f - [Reformer classification head] Implement the reformer model classification head for text classification (#5198)

[Reformer classification head] Implement the reformer model classification head for text classification (#5198) * Reformer model head classification implementation for text classification * Reformat the reformer model classification code * PR review comments, and test case implementation for reformer for classification head changes * CI/CD reformer for classification head test import error fix * CI/CD test case implementation added ReformerForSequenceClassification to all_model_classes * Code formatting- fixed * Normal test cases added for reformer classification head * Fix test cases implementation for the reformer classification head * removed token_type_id parameter from the reformer classification head * fixed the test case for reformer classification head * merge conflict with master fixed * merge conflict, changed reformer classification to accept the choice_label parameter added in latest code * refactored the the reformer classification head test code * reformer classification head, common transform test cases fixed * final set of the review comment, rearranging the reformer classes and docstring add to classification forward method * fixed the compilation error and text case fix for reformer classification head * Apply suggestions from code review Remove unnecessary dup Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>