larroy edited a comment on issue #14779: [WIP] Fully connected, higher order grad URL: https://github.com/apache/incubator-mxnet/pull/14779#issuecomment-510624357 The development is only for flattened inputs. What I call Pi is the product of additional dimensions which are flattened, as seen in the bottom right, additional dimensions are flattened together and the shape is (s0, Product...) . this can be seen in the implementation of FCBackward. https://github.com/apache/incubator-mxnet/blob/master/src/operator/nn/fully_connected-inl.h#L151
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