Asking support for linear layer in spc features.

[sparse-mvs-2]

The method of kaolin.ops.spc.Conv3d is great to handle batches of spc features. However, when I want to write a self-attention layer, I need to use nn.linear. That means, have to transfer the the spc.features of shape (L,C) to (B, l_max, C) with padding. Is there any elegant way to handle this without padding and transfer the features to (B, l_max, C)?

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