Python3 and python2 use different encoding, see e.g. https://stackoverflow.com/questions/11305790/pickle-incompatability-of-numpy-arrays-between-python-2-and-3
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Python3 and python2 use different encoding, see e.g. https://stackoverflow.com/questions/11305790/pickle-incompatability-of-numpy-arrays-between-python-2-and-3