Qian Zhao 4147e976a6
[Fix] ZeroRedundancyOptimizer ambiguous error with param groups when pytorch < 1.12.0 (#818)
* fix zero_optimizer error with param groups when pytorch < 1.12.0

* add docstring

* fix docstring

* add unittest

* change ut to use a valid paramwise_cfg

* modify ut

* fix as comments
2022-12-19 17:07:58 +08:00
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