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並前往https://docs.scipy.org/doc/numpy-1.9.2/reference/generated/numpy.isnan.html

numpy.isnan — NumPy v1.9 Manual

Test element-wise for NaN and return result as a boolean array. ... np.isnan(np.nan) True >>> np.isnan(np.inf) False >>> np.isnan([np.log(-1.) ...

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