I don't see anything in the source that might be causing this, e.g. there is one hsplit, but I don't see where in the test function an array_split would be used ...

Splits a Pandas DataFrame into feature Numpy ndarray and label Numpy ndarray. If output_1d_label is set, label will be output as a 1d array instead of a 2d array. As shown in the below screenshot, ...

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Python is convenient and flexible, yet notably slower than other languages for raw computational speed. The Python ecosystem has compensated with tools that make crunching numbers at scale in Python ...