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Add transpose to DGCNN segmentation output

Merge branch 'master' of https://github.com/FlyingGiraffe/vnn

Add weight decay to SGD optimizer

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Change default optimizer and lr

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Merge pull request #4 from ray8828/fix-nan

add EPS to x/norm to avoid nan when some vi = [0,0,0]; also use norm instead of sqrt to protect the gradient

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Initial commit with core code

Initial commit