Resources to learn about TorchSparse and sparse tensor operations in general

I am doing research related to point-cloud processing and struggle to understand the usages of [TorchSparse](https://github.com/mit-han-lab/torchsparse) library in repository such as [this](https://github.com/PJLab-ADG/OpenPCSeg), mostly because of hashing functions. The library itself has little to no documentation as well.

Which resources can I use to build my knowledge of sparse tensor from ground up? Which repositories can I look into to grasp the basic understanding of TorchSparse library?

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