[hybrid performance] all reduce fusion for sharding #34480
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python/paddle/distributed/fleet/meta_optimizers/sharding/utils.py
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Describe
allreduce fuse supports for sharding_optimizer
Throughput test
Using GPT model, 8 * V100, fuse_grad_in_size=32MB
dp=4 sharding=2
Loss curve
dp_hybrid_sharding
dp_pp_hybrid_sharding
