I don't know why this is not work.
```
MXLayer[
{3, 16, 9},
{64, 16, 9},
NeuralNetworks`Private`SetOutput["Output",
NeuralNetworks`Private`SowNode["Convolution",
NeuralNetworks`Private`GetInput["Input"],
"weight" -> RandomReal[1, {64, 3, 3, 3}],
"num_filter" -> 64,
"kernel" -> {3, 3}
]
]&
]
Internal`$LastInternalFailure
```