// {{node, x_y_sum}} = Add(x, y) in the error message. See routine interpolate
// in tensorflow/python/framework/error_interpolation.py for more detail.
static std::string InterpolateErrorMessage(std::string message) {
  // See _NAME_REGEX in tensorflow/python/framework/error_interpolation.py
  // Change "prefix {{node tag.name}} suffix" to "prefix tag.name suffix".