GitLab

* fix bad merge - dropped code

* remove --model_parallel

* Deal with TrainingArguments

* Use a private attr and fix batch sizes

* fix _n_gpu

* add is_parallel helper wrapper

* fix attribute

* introduce a new attribute is_model_parallel

* docs

* docs

* Put back init False and rearrange doc

* Ignore non-init args in HFArgumentParser
Co-authored-by: Sylvain Gugger <sylvain.gugger@gmail.com>