行列向量转换

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doc: https://docs.scipy.org/doc/numpy/reference/generated/numpy.reshape.html

newshape : int or tuple of ints

The new shape should be compatible with the original shape. If an integer, then the result will be a 1-D array of that length. One shape dimension can be -1. In this case, the value is inferred from the length of the array and remaining dimensions.