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97 lines
2.7 KiB
Python
97 lines
2.7 KiB
Python
# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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class Registry(object):
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"""
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The registry that provides name -> object mapping, to support third-party users' custom modules.
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To register an object:
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.. code-block:: python
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BACKBONES = Registry('backbone')
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@BACKBONES.register()
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class ResNet:
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pass
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Or:
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.. code-block:: python
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BACKBONES = Registry('backbone')
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class ResNet:
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pass
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BACKBONES.register(ResNet)
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Usage: To build a module.
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.. code-block:: python
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backbone_name = "ResNet"
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b = BACKBONES.get(backbone_name)()
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"""
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def __init__(self, name):
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"""
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Args:
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name (str): the name of this registry
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"""
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self._name = name
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self._obj_map = {}
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def __contains__(self, key):
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return self._obj_map.get(key) is not None
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def _do_register(self, name, obj):
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assert (
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name not in self._obj_map
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), "An object named '{}' was already registered in '{}' registry!".format(
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name, self._name)
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self._obj_map[name] = obj
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def register(self, obj=None, name=None):
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"""
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Register the given object under the the name `obj.__name__`.
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Can be used as either a decorator or not. See docstring of this class for usage.
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"""
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if obj is None:
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# used as a decorator
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def deco(func_or_class, name=name):
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if name is None:
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name = func_or_class.__name__
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self._do_register(name, func_or_class)
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return func_or_class
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return deco
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# used as a function call
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if name is None:
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name = obj.__name__
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self._do_register(name, obj)
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def get(self, name):
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"""Get the registry record.
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Args:
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name (str): The class name.
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Returns:
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ret: The class.
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"""
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ret = self._obj_map.get(name)
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if ret is None:
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raise KeyError(
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"No object named '{}' found in '{}' registry!".format(
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name, self._name))
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return ret
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