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Summary: avoid creating a numpy array of random things just to split it: this can now generate a warning e.g. if the list contains lists of varying lengths. There might also be a performance win here, and we could do more of the same if we care about that. (The vanilla way to avoid the new warning is to replace `np.split(a,` with `np.split(np.array(a, dtype=object), ` btw.) Reviewed By: shapovalov Differential Revision: D40209308 fbshipit-source-id: daae33a23ceb444e8e7241f72ce1525593e2f239
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