@masahi, for other ops, pad can support any dimentions. I am looking at pooling, it seems there would be some works, current pooling [implementation ](https://github.com/apache/incubator-tvm/blob/ba9d96bcb585557d4d3dbee40112367b08b28084/topi/include/topi/nn/pooling.h#L61)only supports 2D. I am thinking to create a unified version as we did for convolution.
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