src/transformers/models/imagegpt/modeling_imagegpt.py/ImageGPTMLP/forward
class ImageGPTMLP:    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
        hidden_states = self.c_fc(hidden_states)
        hidden_states = self.act(hidden_states)
        hidden_states = self.c_proj(hidden_states)
        hidden_states = self.dropout(hidden_states)
        return hidden_states