datasets/ClassPrioritySampler.py [130:148]:
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    @property
    def size(self):
        return self._tree_size

    @property
    def capacity(self):
        return self._capacity

    def __len__(self):
        return self.capacity

    def pointer_to_treeidx(self, pointer):
        assert pointer < self.capacity
        return int(pointer + self.capacity - 1)

    def update(self, pointer, priority):
        assert pointer < self.capacity
        tree_idx = self.pointer_to_treeidx(pointer)
        priority += self.fixed_weights[pointer]
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datasets/MixedPrioritizedSampler.py [86:104]:
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    @property
    def size(self):
        return self._tree_size

    @property
    def capacity(self):
        return self._capacity

    def __len__(self):
        return self.capacity

    def pointer_to_treeidx(self, pointer):
        assert pointer < self.capacity
        return int(pointer + self.capacity - 1)

    def update(self, pointer, priority):
        assert pointer < self.capacity
        tree_idx = self.pointer_to_treeidx(pointer)
        priority += self.fixed_weights[pointer]
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