utils.h

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#pragma once
 
#include "../Matrix.h"
#include "../matrix_utils.h"
 
double relu(const double& in) { return std::max(0.0, in); }
double sigmoid(const double& in) { return 1.0 / (1.0 + exp(-in)); }
 
Matrix<double> Sigmoid(const Matrix<double>& in) {
  // real sigmoid in lambda
  return in.Apply([](const double& a) { return sigmoid(a); });
}
 
double accuracy(const Matrix<double>& predictions, const Matrix<double>& ground_truth) {
  return (double)Corr(predictions, ground_truth) / predictions.rows();
}