Create a sub layer. The created sub layer can be accessed by `name`. E.g.:: self.CreateChild('foo', foo_params) self.foo.FProp... or:: self.children['foo'].Fprop... self.children.foo.Fprop... If the layer does not have a name set, i.e. foo_params.name
(self, name: str, params: BaseLayerParamsT)
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