Created by: wangchaochaohu

修复fusion group 在反向Op output stop_gradient 出错的问题

单测添加已验证

Reset50检测正确

I0330 13:07:24.908324 94757 fusion_group_pass.cc:36] Detect 32 elementwise fusion groups.
I0330 13:07:25.032783 94757 build_strategy.cc:376] SeqOnlyAllReduceOps:0, num_trainers:1