Crashes with internal assert while parsing options

[malfet]

🐛 Describe the bug

See example below:

$ python3 torchchat.py generate  --help
Traceback (most recent call last):
  File "/home/nshulga/git/pytorch/torchchat/torchchat.py", line 53, in <module>
    args = parser.parse_args()
           ^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 1869, in parse_args
    args, argv = self.parse_known_args(args, namespace)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 1902, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 2096, in _parse_known_args
    positionals_end_index = consume_positionals(start_index)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 2073, in consume_positionals
    take_action(action, args)
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 1978, in take_action
    action(self, namespace, argument_values, option_string)
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 1241, in __call__
    subnamespace, arg_strings = parser.parse_known_args(arg_strings, None)
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 1902, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 2114, in _parse_known_args
    start_index = consume_optional(start_index)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 2054, in consume_optional
    take_action(action, args, option_string)
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 1978, in take_action
    action(self, namespace, argument_values, option_string)
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 1119, in __call__
    parser.print_help()
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 2601, in print_help
    self._print_message(self.format_help(), file)
                        ^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 2585, in format_help
    return formatter.format_help()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 286, in format_help
    help = self._root_section.format_help()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 217, in format_help
    item_help = join([func(*args) for func, args in self.items])
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 217, in <listcomp>
    item_help = join([func(*args) for func, args in self.items])
                      ^^^^^^^^^^^
  File "/home/nshulga/miniconda3/envs/py311/lib/python3.11/argparse.py", line 341, in _format_usage
    assert ' '.join(opt_parts) == opt_usage
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

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