In TransformerConv what is the index: Tensor, ptr: OptTensor, size_i: Optional[int] parameters in message method

[Akhil-CM]

In TransformerConv, there is the usage of index, ptr, and size_i in the message method. But it is not passed in the propagate method like so:

out = self.propagate(edge_index, query=query, key=key, value=value,
                             edge_attr=edge_attr)

Where does the message method get these arguments?

[EdisonLeeeee]

It's automatically collected by the class methods from MessagePassing according to the arguments provided in propagate.