src/transformers/models/visual_bert/modeling_visual_bert.py/VisualBertLayer/__init__
class VisualBertLayer:    def __init__(self, config):
        super().__init__()
        self.chunk_size_feed_forward = config.chunk_size_feed_forward
        self.seq_len_dim = 1
        self.attention = VisualBertAttention(config)
        self.intermediate = VisualBertIntermediate(config)
        self.output = VisualBertOutput(config)