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control following behaviors:
1. export Flags_mp_aysnc_allreduce=True to turn on mp async all_reduce
2. export Flags_skip_mp_c_identity=True to skip two c_identity operators
in dygraph mode.
3. export Flags_fused_linear_param_grad_add to enable fused_linear_param_grad_add
in ColumnParallel backward with mp async all_reduce.
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Description
PCard-70444.
Add mp_all_reduce asynchronize overlap.
Use environment flags to control following behaviors:
export Flags_mp_aysnc_allreduce=True
to turn on mp async all_reduceexport Flags_skip_mp_c_identity=True
to skip two c_identity operators in dygraph mode.export Flags_fused_linear_param_grad_add=True
to enable fused_linear_param_grad_add in ColumnParallelLinear backward with mp async all_reduce.