Transpose array and actually reorder memory

The copy() method will reorder to C-contiguous order by default:

b = a.transpose(0,2,1).copy()

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Be careful: the copy() function has a different default behavior. With the function, you must explicitly specify the order to ensure a C-contiguous copy:

b = np.copy(a.transpose(0,2,1), order='C')

(Note that the docstring for the function says that the ndarray method is the preferred method for creating an array copy.)

Under the hood, the stride of b is different than a.

prefer to use ascontiguousarray, which will copy the memory when it's needed. Whereas copy will always copy memory.