How to use 'numpy harmonic mean' in Python
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58 def harmonic_mean(a, weights=None): 59 if any([x == 0 for x in a]): 60 return 0 61 else: 62 assert weights is None or len(weights) == len(a), 'Weights has length {} which is different from that of the array ({}).'.format(len(weights), len(a)) 63 if weights is None: 64 return len(a) / sum([1/x for x in a]) 65 else: 66 return sum(weights) / sum(w/x for x, w in zip(a, weights))