style(model-based): fix mypy and polish api docstring

[Gaiejj]

Description

• Clean useless argument.
• Specify typing. For example: list -> list[float].
• Fix api docstring. For example, some argument docs is np.ndarray but actually it is torch.Tensor.
• Clear redundant code. Some methods simply unused, so I delete it.

Motivation and Context

Some codes and docs exist problems and need to be polished.
This pull request solves issue #230

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide. (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly. (required for a bug fix or a new feature)
• I have updated the documentation accordingly.
• I have reformatted the code using make format. (required)
• I have checked the code using make lint. (required)
• I have ensured make test pass. (required)

[zmsn-2077]

LGTM.

[hdadong]

LGTM.