MAINT Remove commented dissimilarities (#23457)

glemaitre · glemaitre · commit bb6a0efb02b7 · 2022-08-05T14:58:55.000+02:00
diff --git a/sklearn/metrics/_dist_metrics.pyx b/sklearn/metrics/_dist_metrics.pyx
@@ -1097,72 +1097,6 @@ cdef class HaversineDistance(DistanceMetric):
         tmp = np.sin(0.5 * dist)
         return tmp * tmp
 
-
-#------------------------------------------------------------
-# Yule Distance (boolean)
-#  D(x, y) = 2 * ntf * nft / (ntt * nff + ntf * nft)
-# [This is not a true metric, so we will leave it out.]
-#
-#cdef class YuleDistance(DistanceMetric):
-#    cdef inline DTYPE_t dist(self, const DTYPE_t* x1, const DTYPE_t* x2,
-#                             ITYPE_t size):
-#        cdef int tf1, tf2, ntf = 0, nft = 0, ntt = 0, nff = 0
-#        cdef np.intp_t j
-#        for j in range(size):
-#            tf1 = x1[j] != 0
-#            tf2 = x2[j] != 0
-#            ntt += tf1 and tf2
-#            ntf += tf1 and (tf2 == 0)
-#            nft += (tf1 == 0) and tf2
-#        nff = size - ntt - ntf - nft
-#        return (2.0 * ntf * nft) / (ntt * nff + ntf * nft)
-
-
-#------------------------------------------------------------
-# Cosine Distance
-#  D(x, y) = dot(x, y) / (|x| * |y|)
-# [This is not a true metric, so we will leave it out.]
-#
-#cdef class CosineDistance(DistanceMetric):
-#    cdef inline DTYPE_t dist(self, const DTYPE_t* x1, const DTYPE_t* x2,
-#                             ITYPE_t size):
-#        cdef DTYPE_t d = 0, norm1 = 0, norm2 = 0
-#        cdef np.intp_t j
-#        for j in range(size):
-#            d += x1[j] * x2[j]
-#            norm1 += x1[j] * x1[j]
-#            norm2 += x2[j] * x2[j]
-#        return 1.0 - d / sqrt(norm1 * norm2)
-
-
-#------------------------------------------------------------
-# Correlation Distance
-#  D(x, y) = dot((x - mx), (y - my)) / (|x - mx| * |y - my|)
-# [This is not a true metric, so we will leave it out.]
-#
-#cdef class CorrelationDistance(DistanceMetric):
-#    cdef inline DTYPE_t dist(self, const DTYPE_t* x1, const DTYPE_t* x2,
-#                             ITYPE_t size):
-#        cdef DTYPE_t mu1 = 0, mu2 = 0, x1nrm = 0, x2nrm = 0, x1Tx2 = 0
-#        cdef DTYPE_t tmp1, tmp2
-#
-#        cdef np.intp_t i
-#        for i in range(size):
-#            mu1 += x1[i]
-#            mu2 += x2[i]
-#        mu1 /= size
-#        mu2 /= size
-#
-#        for i in range(size):
-#            tmp1 = x1[i] - mu1
-#            tmp2 = x2[i] - mu2
-#            x1nrm += tmp1 * tmp1
-#            x2nrm += tmp2 * tmp2
-#            x1Tx2 += tmp1 * tmp2
-#
-#        return (1. - x1Tx2) / sqrt(x1nrm * x2nrm)
-
-
 #------------------------------------------------------------
 # User-defined distance
 #
