Created by: suchenzang
Continuing the breakdown of https://github.com/facebookresearch/metaseq/pull/197
Remove:
- unused
full_context_alignmentarg (always kept asFalse) - unused
alignment_headsarg (default all heads) - unused
char_inputsarg (controls anexportflag that isn't ever used) - unused
alignment_layerarg (default is always last layer)