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Towards #6455.
This PR makes the following changes
Pooling
base class. The current implementation isn't flexible enough to support all pooling operators. Instead pooling operators will implement their own forward method, usingSelect
,Connect
andAggregate
operators.Select
operator. It now returnsSelectOutput
which containsnode_index
,cluster_index
,num_clusters
andweight
. Whereweight
is the weight given to a node assignment to a cluster.