82 lines
2.4 KiB
Python
82 lines
2.4 KiB
Python
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import inspect
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import six
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# borrow from mmdetection
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def is_str(x):
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"""Whether the input is an string instance."""
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return isinstance(x, six.string_types)
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class Registry(object):
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def __init__(self, name):
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self._name = name
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self._module_dict = dict()
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def __repr__(self):
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format_str = self.__class__.__name__ + '(name={}, items={})'.format(
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self._name, list(self._module_dict.keys()))
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return format_str
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@property
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def name(self):
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return self._name
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@property
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def module_dict(self):
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return self._module_dict
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def get(self, key):
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return self._module_dict.get(key, None)
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def _register_module(self, module_class):
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"""Register a module.
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Args:
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module (:obj:`nn.Module`): Module to be registered.
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"""
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if not inspect.isclass(module_class):
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raise TypeError('module must be a class, but got {}'.format(
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type(module_class)))
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module_name = module_class.__name__
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if module_name in self._module_dict:
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raise KeyError('{} is already registered in {}'.format(
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module_name, self.name))
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self._module_dict[module_name] = module_class
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def register_module(self, cls):
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self._register_module(cls)
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return cls
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def build_from_cfg(cfg, registry, default_args=None):
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"""Build a module from config dict.
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Args:
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cfg (dict): Config dict. It should at least contain the key "type".
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registry (:obj:`Registry`): The registry to search the type from.
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default_args (dict, optional): Default initialization arguments.
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Returns:
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obj: The constructed object.
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"""
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assert isinstance(cfg, dict) and 'type' in cfg
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assert isinstance(default_args, dict) or default_args is None
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args = {}
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obj_type = cfg.type
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if is_str(obj_type):
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obj_cls = registry.get(obj_type)
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if obj_cls is None:
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raise KeyError('{} is not in the {} registry'.format(
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obj_type, registry.name))
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elif inspect.isclass(obj_type):
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obj_cls = obj_type
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else:
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raise TypeError('type must be a str or valid type, but got {}'.format(
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type(obj_type)))
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if default_args is not None:
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for name, value in default_args.items():
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args.setdefault(name, value)
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return obj_cls(**args)
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