Fuse modules.
Return a list of modules that fuses the operations specified in the input module list.
Fuses only the following sequence of modules: conv, bn; conv, bn, relu; conv, relu; conv, bn, add; conv, bn, add, relu; conv, add; conv, add, relu; linear, bn; linear, bn, relu; linear, relu; linear, bn, add; linear, bn, add, relu; linear, add; linear, add, relu. For these sequences, the first element in the output module list performs the fused operation. The rest of the elements are set to nn.Identity()