src/transformers/models/funnel/modeling_funnel.py/FunnelPositionwiseFFN/forward
class FunnelPositionwiseFFN:    def forward(self, hidden: torch.Tensor) -> torch.Tensor:
        h = self.linear_1(hidden)
        h = self.activation_function(h)
        h = self.activation_dropout(h)
        h = self.linear_2(h)
        h = self.dropout(h)
        return self.layer_norm(hidden + h)