Embedding dropout and self.bn not included in ModuleList

Part 1 (2019)
1

In the constructor of MixedInputModel class, self.bns is a ModuleList which contains batchNormlization modules for hidden layers . Similarly, self.drops is also a ModuleList which contains DropOut Modules for hidden layers. But self.emb_drop and self.bn are not included in ModuleList. Why is that?