add GradientOperatorMulTest 。 #642
Merged
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当对于张量乘法算式进行求导时,
无论是变量是单个数,还是常量是单个数,而另一个又是一个数组时,
如果组成乘法的算式将常量放乘法左边,变量放乘法右边,
对这个算式进行求导时,会发生求导返回值为 null 的情况。