Whether parse_args shoulde be replaced by parse_known_args?

For now, cli throws an exception `unrecognized arguments` if some redundant parameters was provided. Most of the parameters are common of different training ways.

Start by locating the CLI entry points that call parse_args and review how arguments are defined for the different training paths. Compare the current behavior with parse_known_args using the redundant common-parameter case described in the issue, and verify that the intended training arguments still work without an unrecognized-arguments exception.

Written by the indexing model from the issue text.