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* merge context * update unit test * add docstring * fix bug in AmpOptimWrapper * add docstring for backward * add warning and docstring for accumuate gradient * fix docstring * fix docstring * add params_group method * fix as comment * fix as comment * make default_value of loss_scale to dynamic * Fix docstring * decouple should update and should no sync * rename attribute in OptimWrapper * fix docstring * fix comment * fix comment * fix as comment * fix as comment and add unit test