RuntimeWarning: divide by zero encountered in log

numpy.log10(prob) calculates the base 10 logarithm for all elements of prob, even the ones that aren’t selected by the where. If you want, you can fill the zeros of prob with 10**-10 or some dummy value before taking the logarithm to get rid of the problem. (Make sure you don’t compute prob > 0.0000000001 with dummy values, though.)

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