src/transformers/models/layoutlm/modeling_layoutlm.py/LayoutLMAttention/__init__
class LayoutLMAttention:    def __init__(self, config, position_embedding_type=None):
        super().__init__()
        self.self = LayoutLMSelfAttention(config, position_embedding_type=position_embedding_type)
        self.output = LayoutLMSelfOutput(config)
        self.pruned_heads = set()