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# Copyright (c) OpenMMLab. All rights reserved.
from ..runner import Sequential
from ..utils import Registry, build_from_cfg
def build_model_from_cfg(cfg, registry, default_args=None):
"""Build a PyTorch model from config dict(s). Different from
``build_from_cfg``, if cfg is a list, a ``nn.Sequential`` will be built.
Args:
cfg (dict, list[dict]): The config of modules, is is either a config
dict or a list of config dicts. If cfg is a list, a
the built modules will be wrapped with ``nn.Sequential``.
registry (:obj:`Registry`): A registry the module belongs to.
default_args (dict, optional): Default arguments to build the module.
Defaults to None.
Returns:
nn.Module: A built nn module.
"""
if isinstance(cfg, list):
modules = [
build_from_cfg(cfg_, registry, default_args) for cfg_ in cfg
]
return Sequential(*modules)
else:
return build_from_cfg(cfg, registry, default_args)
MODELS = Registry('model', build_func=build_model_from_cfg)
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