[Accuracy diff No.136] Fix accuracy diff for paddle.scale API #264
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paddle.scale 只对 x 计算梯度

而 ScaleRule 中对应的 torch_api 是组合实现的

因此对scale或bias的梯度检查都会产生 [no compare]。
如果不额外为 scale kernel 增加反向算子的话则设置额外的 accuracy 检查规则
回测结果:
