[AMP] Refine found_inf of loss_scaler #37770
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PR types
Performance optimization
PR changes
APIs
Describe
AmpScaler类用于混合精度训练过程中对loss进行缩放，其中成员属性：_found_inf用于标记每轮训练过程中参数梯度是否存在inf。原本框架代码会在调用
check_finite_and_unscaleop通过to_variable申请两个bool类型的tensor，导致每轮训练在该时间存在cudaMemcpy，影响GPU性能：优化后，将在
AmpScaler类初始化过程中声明并定义两个bool类型的tensor，消除训练过程中的cudaMemcpy：