Add scatter propagation rule #169
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PyTorch only supports Replicate sharding. Add sharded replication rules as well, taken from scatter_add from PyTorch
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PyTorch only supports Replicate sharding. Add sharded replication rules as well, taken from scatter_add from PyTorch.
This was needed for my implementation of MOE from #3
cc @zpcore as it would be good to have this rule improved in PyTorch