[Cherry-pick] Fix the nan bug when passing all zero values into clip_by_norm_op. (#30777) #32038
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chenwhql
approved these changes
Apr 2, 2021
lanxianghit
approved these changes
Apr 2, 2021
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PR types
Bug fixes
PR changes
OPs
Describe
As described above, if all input grads are zero, the output of
clip_by_normwill be inf or nan. This pr is used to fix this bug.