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NumPy 中 `np.r_` 和 `np.c_` 怎么用?与 `np.hstack`、`np.vstack` 有什么区别?
参考: https://docs.scipy.org/doc/numpy/reference/generated/numpy.r_.html#numpy.r_ https://docs.scipy.org/doc/numpy/reference/generated/numpy.c_.html#numpy.c_