src/transformers/models/gptsan_japanese/modeling_gptsan_japanese.py/GPTSanJapaneseLayerDenseFF/__init__
class GPTSanJapaneseLayerDenseFF:    def __init__(self, config: GPTSanJapaneseConfig):
        super().__init__()
        # Check if it is a sparse layer, if not then it is a dense layer
        self.mlp = GPTSanJapaneseDenseActDense(config, ext_layer=True)
        self.norm = nn.LayerNorm(config.d_model, eps=config.layer_norm_epsilon)