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Motivation

This PR is converted to DRAFT because I think this may break the design of Registry and may mess up some concept. I will re-examine the necessity and rationality of this change.

Support registering partial functions in MMEngine, solve #594

This feature might be required by FSDP for auto_wrap_policies

Modification

modify Registry to accept all Callable, including classes, functions, partial functions and more

BC-breaking (Optional)

No

Use cases (Optional)

import functools
from mmengine.registry import Registry
FUNCS = Registry('funcs')
@FUNCS.register_module('resnet')
def build_resnet(layers=50, activation='relu'):
    pass
build_resnet18 = functools.partial(build_resnet, layers=18)
FUNCS.register_module('resnet18', False, build_resnet18)
model = FUNCS.build(dict(type='resnet18', activation='silu'))

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.