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NVIDIA / MinkowskiEngine

Minkowski Engine is an auto-diff neural network library for high-dimensional sparse tensors
https://nvidia.github.io/MinkowskiEngine
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point index mapping after conv #391

Open Liumouliu opened 3 years ago

Liumouliu commented 3 years ago

Hi,

Thank you for the great work.

I want to get the index mapping table for the following problem. Is it possible?

Given an input 3D point cloud with size at Mx3, after several convs, I get a feature map with size Nxd, where M,N,d are the number of 3D points/features and feature dimension,respectively.

I want to known the index mapping table between the input and feature map.

Specifically, for a feature i in the feature map, what are the point indexes used to compute the feature i in the input 3D point cloud?

Thank you very much! Best, liu