Preprocess.hpp is broken

[theshoonyam]

In mlpack/methods/preprocess.hpp, it is mentioned that there is a file preprocess.hpp inside folder preprocess, but I could not find any such file inside the aforementioned folder.

If I am wrong, then please correct me else please consider the issue.

Thanks in advance for reply.

[theshoonyam]

One more thing to mention, the file mlpack.hpp does not contain the path to the below mentioned folder.

• Linear SVM
• nmf
• nystroem method
• preprocess

[AdarshSantoria]

I agree with @Aadi-Raj but not for nmf and nystroem as their paths are indirectly included in mlpack.hpp not directly in file but on file that are included in mlpack.hpp. We can use them just by including mlpack.hpp. An example in support of my statement,

#include <mlpack.hpp>

using namespace arma;
using namespace mlpack;
using namespace mlpack::ann;
using namespace std;

int main()
{
	mat w = randu<mat>(20, 12);
	mat h = randu<mat>(12, 20);
	mat v = w * h;
	size_t r = 12;
	AMF<> nmf;
	nmf.Apply(v, r, w, h);

	for (size_t trial = 0; trial < 3; ++trial)
	{
		arma::mat data;
		data.randu(5, trial * 200);

		GaussianKernel gk;
		NystroemMethod<GaussianKernel, OrderedSelection> nm(data, gk, trial * 200);

		arma::mat g;
		nm.Apply(g);

		// Construct exact kernel matrix.
		arma::mat kernel(trial * 200, trial * 200);
		for (size_t i = 0; i < trial * 200; ++i)
		for (size_t j = 0; j < trial * 200; ++j)
			kernel(i, j) = gk.Evaluate(data.col(i), data.col(j));

		// Reconstruct approximation.
		arma::mat approximation = g * g.t();
	}
}

This code will run fine.

[rcurtin]

Thanks for the bug report! I opened #3374 which should handle the problems you pointed out. 👍