[Feature Request] dpmodel and pt fitting should export several methods

[njzjz]

Summary

Fitting should add methods to get fparam, aparam, and sel_types.

Detailed Description

Add these methods so the model can get it.

deepmd-kit/deepmd/dpmodel/model/dp_atomic_model.py

Lines 147 to 162 in 612bedc

	def get_dim_fparam(self) -> int:
	"""Get the number (dimension) of frame parameters of this atomic model."""
	return 0
	def get_dim_aparam(self) -> int:
	"""Get the number (dimension) of atomic parameters of this atomic model."""
	return 0
	def get_sel_type(self) -> List[int]:
	"""Get the selected atom types of this model.
	Only atoms with selected atom types have atomic contribution
	to the result of the model.
	If returning an empty list, all atom types are selected.
	"""
	return []

Further Information, Files, and Links

No response

[wanghan-iapcm]

The methods in the linear_atomic_models should be rethink.

[anyangml]

added in this PR #3266

[njzjz]

The methods in the linear_atomic_models should be rethink.

This will be tracked in #3502 instead.