word_distance.py 文件源码

def pwdist_canberra(self, seq1idx, seq2idx):
        """Compute the Canberra distance between two vectors.

        References:
            1. http://scipy.org/

        Notes:
            When `u[i]` and `v[i]` are 0 for given i, then
            the fraction 0/0 = 0 is used in the calculation.
        """
        u = self[seq1idx]
        v = self[seq2idx]
        olderr = np.seterr(invalid='ignore')
        try:
            d = np.nansum(abs(u - v) / (abs(u) + abs(v)))
        finally:
            np.seterr(**olderr)
        return d