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extended MinProblemSolver::Function to 1) report the space dimensionality, 2) compute gradient if needed

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This commit is contained in:
Vadim Pisarevsky
2015-05-05 15:56:06 +03:00
parent 5b9182ba43
commit 63a63e3eaa
5 changed files with 32 additions and 5 deletions
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modules/core/src/conjugate_gradient.cpp
+19
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@@ -46,6 +46,25 @@
namespace cv
{
double MinProblemSolver::Function::getGradientEps() const { return 1e-3; }
void MinProblemSolver::Function::getGradient(const double* x, double* grad)
{
double eps = getGradientEps();
int i, n = getDims();
AutoBuffer<double> x_buf(n);
double* x_ = x_buf;
for( i = 0; i < n; i++ )
x_[i] = x[i];
for( i = 0; i < n; i++ )
{
x_[i] = x[i] + eps;
double y1 = calc(x_);
x_[i] = x[i] - eps;
double y0 = calc(x_);
grad[i] = (y1 - y0)/(2*eps);
x_[i] = x[i];
}
}
#define SEC_METHOD_ITERATIONS 4
#define INITIAL_SEC_METHOD_SIGMA 0.1