How `subcommand' works?
In subcommand.py:
if 'func' in dir(args):
# Import any additional modules needed (to register custom classes).
for package_name in getattr(args, 'include_package', ()):
import_submodules(package_name)
args.func(args)
else:
parser.print_help()
while in predict.py:
subparser.set_defaults(func=_predict)
Finally, it calls the function _predict() in predict.py, if we type in the command :
allennlp predict.
