Specify config filename in HfArgumentParser

[jarednielsen]

Currently, HfArgumentParser will load arguments from a config file if that config file is the same name as the script being run. So train.py would have a corresponding train.args. This extends the method to load from any config file that is specified. So train.py could use a bert-large.args or a bert-small.args.

[codecov]

Codecov Report

Merging #6626 into master will decrease coverage by 0.11%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #6626      +/-   ##
==========================================
- Coverage   79.98%   79.87%   -0.12%     
==========================================
  Files         153      153              
  Lines       28005    28007       +2     
==========================================
- Hits        22401    22371      -30     
- Misses       5604     5636      +32     

Impacted Files	Coverage Δ
src/transformers/hf_argparser.py	67.74% <0.00%> (-1.49%)	⬇️
src/transformers/modeling_tf_distilbert.py	64.47% <0.00%> (-32.95%)	⬇️
src/transformers/file_utils.py	82.44% <0.00%> (+0.25%)	⬆️
src/transformers/generation_tf_utils.py	80.70% <0.00%> (+1.50%)	⬆️
src/transformers/modeling_tf_flaubert.py	87.73% <0.00%> (+63.19%)	⬆️

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[julien-c]

Looks like a nice addition, LGTM

[LysandreJik]

LGTM! cc @sgugger

[sgugger]

Thanks for adding this!