mlpack-3.4.2/doxygen/confusion__matrix_8hpp_source.html

 #ifndef MLPACK_CORE_DATA_CONFUSION_MATRIX_HPP
 #define MLPACK_CORE_DATA_CONFUSION_MATRIX_HPP

 #include <mlpack/prereqs.hpp>

 namespace mlpack {
 namespace data {

 template<typename eT>
 void ConfusionMatrix(const arma::Row predictors,
                      const arma::Row responses,
                      arma::Mat& output,
                      const size_t numClasses);

 } // namespace data
 } // namespace mlpack

 // Include implementation.
 #include "confusion_matrix_impl.hpp"

 #endif
mlpack
Linear algebra utility functions, generally performed on matrices or vectors.
Definition: add_to_cli11.hpp:21

prereqs.hpp
The core includes that mlpack expects; standard C++ includes and Armadillo.

mlpack::data::ConfusionMatrix
void ConfusionMatrix(const arma::Row< size_t > predictors, const arma::Row< size_t > responses, arma::Mat< eT > &output, const size_t numClasses)
A confusion matrix is a summary of prediction results on a classification problem.