factory.py

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class Registery:
    def __init__(self, name):
        self._name = name
        self._dict = dict()
 
    def get(self, key):
        if key in self._dict:
            return self._dict[key]
        else:
            return self._dict['Base']
 
    def register(self, item):
        self._dict[item.__name__] = item
        # renaming *ImageLoader/*VideoLoader
        if 'ImageLoader' in item.__name__:
            name = item.__name__.replace('ImageLoader', '')
            self._dict[name] = item
 
METRICS = Registery('Metrics')
DATALOADERS = Registery('DataLoaders')