Where is CEL module before each crossformer block?

[tungyen]

In paper, there is a CEL module at the start of every stage. Where are their implementation in the source code? It seems that the Patch Embedding Module is used only one time:
`def forward_features(self, x):
x = self.patch_embed(x)
if self.ape:
x = x + self.absolute_pos_embed
x = self.pos_drop(x)

    for layer in self.layers:
        x = layer(x)

    x = self.norm(x)  # B L C
    x = self.avgpool(x.transpose(1, 2))  # B C 1
    x = torch.flatten(x, 1)
    return x`