message: Use auto instead of int
diff: @@ -93,7 +93,7 @@ inline std::pair<Eigen::MatrixXf, Eigen::VectorXf> pca(const Eigen::Ref<const Ei
  const Eigen::SelfAdjointEigenSolver<MatrixXf> eig(cov);
  - const int num_eigenvectors_to_keep = data.rows() - 1;
  + const auto num_eigenvectors_to_keep = data.rows() - 1;
  // Select the eigenvectors and eigenvalues that we want to keep, reverse them (from most significant to
  // least): For 'n' data points, we get at most 'n - 1' non-zero eigenvalues.
  