Merge remote-tracking branch 'refs/remotes/huggingface/master'

transformers/commands/__init__.py

+from abc import ABC, abstractmethod
+from argparse import ArgumentParser
+
+class BaseTransformersCLICommand(ABC):
+    @staticmethod
+    @abstractmethod
+    def register_subcommand(parser: ArgumentParser):
+        raise NotImplementedError()
+
+    @abstractmethod
+    def run(self):
+        raise NotImplementedError()