Ask Your Question

# ffolch's profile - activity

 2021-04-07 10:06:51 -0600 received badge ● Enthusiast 2020-08-04 03:42:29 -0600 asked a question TermCriteria in LogisticRegression TermCriteria in LogisticRegression TermCriteria is not stored in the model file But, when using miniBatch, its member ma 2020-08-04 03:42:27 -0600 asked a question TermCriteria in LogisticRegression TermCriteria in LogisticRegression TermCriteria is not stored in the model file But, when using miniBatch, its member ma 2020-06-25 09:18:47 -0600 marked best answer Mahalanobis function returns squared mahalanobis distance? According to documentation, Mahalanobis distance returns the weighted distance between 2 vectors sqrt(sum_of_weighted_squared_diferences_with_mean) But, in the code, it doesn't seem to calculate the sqrt. It seems to return the square of the Mahalanobis distance. Is is possible? double MahalanobisImpl(const Mat& v1, const Mat& v2, const Mat& icovar, double diff_buffer /[len]/, int len /=v1.total()*/) { CV_INSTRUMENT_REGION(); Size sz = v1.size(); double result = 0; sz.width *= v1.channels(); if (v1.isContinuous() && v2.isContinuous()) { sz.width *= sz.height; sz.height = 1; } { const T* src1 = v1.ptr(); const T* src2 = v2.ptr(); size_t step1 = v1.step/sizeof(src1[0]); size_t step2 = v2.step/sizeof(src2[0]); double* diff = diff_buffer; const T* mat = icovar.ptr(); size_t matstep = icovar.step/sizeof(mat[0]); for (; sz.height--; src1 += step1, src2 += step2, diff += sz.width) { for (int i = 0; i < sz.width; i++) diff[i] = src1[i] - src2[i]; } diff = diff_buffer; for (int i = 0; i < len; i++, mat += matstep) { double row_sum = 0; int j = 0; #if CV_ENABLE_UNROLLED for(; j <= len - 4; j += 4 ) row_sum += diff[j]*mat[j] + diff[j+1]*mat[j+1] + diff[j+2]*mat[j+2] + diff[j+3]*mat[j+3]; #endif for (; j < len; j++) row_sum += diff[j]*mat[j]; result += row_sum * diff[i]; } } return result; }  2020-06-25 04:51:37 -0600 received badge ● Student (source) 2020-06-25 04:26:11 -0600 asked a question Mahalanobis function returns squared mahalanobis distance? Mahalanobis function returns squared mahalanobis distance? According to documentation, Mahalanobis distance returns the