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Fix F.clip_grad_by_norm in the case of small norm #201

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@takuseno takuseno commented Jan 11, 2020

The operation of clip_by_norm must take the maximum value between the L2 norm and the clipping value.

See sony/nnabla#572 .

cc. @TE-AkioHayakawa

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I've added some changes.

  • the unused kernel function has been removed
  • the backward function is corrected

@TE-AkioHayakawa

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