Merge branch 'remove_arg_abv' into 'master'

remoed abbreviation matching from argparser

See merge request ADLR/megatron-lm!78

megatron/arguments.py

@@ -22,7 +22,8 @@ import os
 def parse_args(extra_args_provider=None, defaults={},
                ignore_unknown_args=False):
     """Parse all arguments."""
-    parser = argparse.ArgumentParser(description='Megatron-LM Arguments')
+    parser = argparse.ArgumentParser(description='Megatron-LM Arguments',
+                                     allow_abbrev=False)
 
     # Standard arguments.
     parser = _add_network_size_args(parser)