u_sub_e_sum(g, x, y)¶
Generalized SpMM function. It fuses two steps into one kernel.
Computes messages by sub source node and edge features.
Aggregate the messages by sum as the features on destination nodes.
g (DGLGraph) – The input graph
x (tensor) – The source node features.
y (tensor) – The edge features.
The result tensor.
- Return type
This function supports autograd (computing input gradients given the output gradient). If the feature shape of two input operands do not match, we first broadcasts the features to a unified shape (note that the memory usage will not increase accordingly) and then performs the operation.
Broadcasting follows NumPy semantics. Please see https://docs.scipy.org/doc/numpy/user/basics.broadcasting.html for more details about the NumPy broadcasting semantics.
The sum function will return zero for nodes with no incoming messages.