New transformation: Im2Col rebalancing for certain cases #22
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New transformation
RebalanceIm2Col: For certain hardware that prefers channel parallelism over feature map spatial parallelism, it is possible to reshape the inputs to anIm2Colnode to move some of the spatial dimension into the channels dimension. This transformation attempts to find suchIm2Colnodes, adds aReshapenode in front and alters their kernel/stride sizes accordingly. See list of conditions checked in the implementation for a full list, but one example ofrebalancing is provided in the unit test for this transformation (
test_rebalance_conv.py)