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TermCriteria in LogisticRegression TermCriteria is not stored in the model file But, when using miniBatch, its member ma

TermCriteria in LogisticRegression TermCriteria is not stored in the model file But, when using miniBatch, its member ma

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<T>();
    const T* src2 = v2.ptr<T>();
    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<T>();
    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;
}

Mahalanobis function returns squared mahalanobis distance? According to documentation, Mahalanobis distance returns the