piiswrong commented on issue #9842: Custom Function Shape Inference URL: https://github.com/apache/incubator-mxnet/issues/9842#issuecomment-369063273 Actually. This is not a MXNet bug. Although the error message is not clear. What happened is Conv2D block relies on the mx.sym.Convolution operator to figure out weight shape from data. Adding a custom op to weight blocks that shape inference path. You can solve this by specifying the in_channels argument for Conv2D. We should improve the error message and report "Deferred initialization failed because xx's shape cannot be inferred" @sxjscience
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