cater_preprocessing/utils.py [445:456]:
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            for mask in masks:
                for key in keys:
                    masked_key = []
                    for a, b in zip(key, mask):
                        if b == 1:
                            masked_key.append(a)
                        else:
                            masked_key.append(None)
                    masked_key = tuple(masked_key)
                    if masked_key not in attribute_map:
                        attribute_map[masked_key] = set()
                    attribute_map[masked_key].add(object_idx)
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dvd_generation/utils/dialogue_utils.py [338:349]:
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        for mask in masks:
            for key in keys:
                masked_key = []
                for a, b in zip(key, mask):
                    if b == 1:
                        masked_key.append(a)
                    else:
                        masked_key.append(None)
                masked_key = tuple(masked_key)
                if masked_key not in attribute_map:
                    attribute_map[masked_key] = set()
                attribute_map[masked_key].add(object_idx)
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