src/transformers/models/dpt/modeling_dpt.py/DPTFeatureFusionStage/__init__
class DPTFeatureFusionStage:    def __init__(self, config):
        super().__init__()
        self.layers = nn.ModuleList()
        for _ in range(len(config.neck_hidden_sizes)):
            self.layers.append(DPTFeatureFusionLayer(config))