Config.to_args documents that config values may be bool, int, str, float or a list of them, but two of these cases are broken:

• Lists always fail. The element-type assertion is applied to the list itself (isinstance(v, (int, str, float, bool))), so any list value raises AssertionError: Element type in list is expected to be either int,str,float, but got type 0.
• False booleans produce invalid args. bool is a subclass of int, so False falls through to the int branch and emits --flag False. argparse rejects that for a store_true flag (error: unrecognized arguments: False).

Reproduction:

import argparse
from modelscope.utils.config import Config

def parse_fn(a):
    p = argparse.ArgumentParser()
    p.add_argument('--gpus', type=int, nargs='+')
    p.add_argument('--fp16', action='store_true')
    return p.parse_args(a)

Config(dict(gpus=[0, 1])).to_args(parse_fn)   # AssertionError
Config(dict(fp16=False)).to_args(parse_fn)    # SystemExit: unrecognized arguments: False

Fix:

• check the type of each list element, and pass the elements as separate arguments so they work with nargs;
• omit the flag when a bool is False.

Test: added test_to_args_with_list_and_bool to tests/utils/test_config.py; it fails on master and passes with this change. flake8, isort and yapf are clean on the changed files.