Function DebugString

tensorflow/cc/tutorials/example_trainer.cc:86–97

}

string DebugString(const Tensor& x, const Tensor& y) {
  CHECK_EQ(x.NumElements(), 2);
  CHECK_EQ(y.NumElements(), 2);
  auto x_flat = x.flat<float>();
  auto y_flat = y.flat<float>();
  // Compute an estimate of the eigenvalue via
  //      (x' A x) / (x' x) = (x' y) / (x' x)
  // and exploit the fact that x' x = 1 by assumption
  Eigen::Tensor<float, 0, Eigen::RowMajor> lambda = (x_flat * y_flat).sum();
  return strings::Printf("lambda = %8.6f x = [%8.6f %8.6f] y = [%8.6f %8.6f]",
                         lambda(), x_flat(0), x_flat(1), y_flat(0), y_flat(1));
}

void ConcurrentSteps(const Options* opts, int session_index) {
  // Creates a session.