ALWAYS: This means that a deep copy of the input
array will always be taken.
IF_NEEDED: This means that a deep copy of the input
array will be taken only if necessary.
NEVER: This means that the deep copy will never be taken.
If a copy cannot be avoided then a :None:None:`ValueError` will be raised.
Note that the buffer-protocol could in theory do copies. NumPy currently assumes an object exporting the buffer protocol will never do this.
An enumeration for the copy modes supported by numpy.copy() and numpy.array(). The following three modes are supported,
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