张量系列（tensor02）
张量的两种运算
1. 张量的乘（Tensor product）
tensorproduct()
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2. 张量的缩并
tensorcontraction()
The matrix trace is equivalent to the contraction of a rank-2 array
Matrix product is equivalent to a tensor product of two rank-2 arrays, followed by a contraction of the 2nd and 3rd axes (in Python indexing axes number 1, 2). 
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