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# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import inspect
from collections.abc import Sequence
import warnings
class ComponentManager:
"""
Implement a manager class to add the new component properly.
The component can be added as either class or function type.
Args:
name (str): The name of component.
Returns:
A callable object of ComponentManager.
Examples 1:
from paddleseg.cvlibs.manager import ComponentManager
model_manager = ComponentManager()
class AlexNet: ...
class ResNet: ...
model_manager.add_component(AlexNet)
model_manager.add_component(ResNet)
# Or pass a sequence alliteratively:
model_manager.add_component([AlexNet, ResNet])
print(model_manager.components_dict)
# {'AlexNet': <class '__main__.AlexNet'>, 'ResNet': <class '__main__.ResNet'>}
Examples 2:
# Or an easier way, using it as a Python decorator, while just add it above the class declaration.
from paddleseg.cvlibs.manager import ComponentManager
model_manager = ComponentManager()
@model_manager.add_component
class AlexNet: ...
@model_manager.add_component
class ResNet: ...
print(model_manager.components_dict)
# {'AlexNet': <class '__main__.AlexNet'>, 'ResNet': <class '__main__.ResNet'>}
"""
def __init__(self, name=None):
self._components_dict = dict()
self._name = name
def __len__(self):
return len(self._components_dict)
def __repr__(self):
name_str = self._name if self._name else self.__class__.__name__
return "{}:{}".format(name_str, list(self._components_dict.keys()))
def __getitem__(self, item):
if item not in self._components_dict.keys():
raise KeyError("{} does not exist in availabel {}".format(item,
self))
return self._components_dict[item]
@property
def components_dict(self):
return self._components_dict
@property
def name(self):
return self._name
def _add_single_component(self, component):
"""
Add a single component into the corresponding manager.
Args:
component (function|class): A new component.
Raises:
TypeError: When `component` is neither class nor function.
KeyError: When `component` was added already.
"""
# Currently only support class or function type
if not (inspect.isclass(component) or inspect.isfunction(component)):
raise TypeError("Expect class/function type, but received {}".
format(type(component)))
# Obtain the internal name of the component
component_name = component.__name__
# Check whether the component was added already
if component_name in self._components_dict.keys():
warnings.warn("{} exists already! It is now updated to {} !!!".
format(component_name, component))
self._components_dict[component_name] = component
else:
# Take the internal name of the component as its key
self._components_dict[component_name] = component
def add_component(self, components):
"""
Add component(s) into the corresponding manager.
Args:
components (function|class|list|tuple): Support four types of components.
Returns:
components (function|class|list|tuple): Same with input components.
"""
# Check whether the type is a sequence
if isinstance(components, Sequence):
for component in components:
self._add_single_component(component)
else:
component = components
self._add_single_component(component)
return components
MODELS = ComponentManager("models")
BACKBONES = ComponentManager("backbones")
DATASETS = ComponentManager("datasets")
TRANSFORMS = ComponentManager("transforms")
LOSSES = ComponentManager("losses")
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