message: [tf.data] Fix some comment in the gradient descent algorithm.
diff: @@ -1562,9 +1562,8 @@ void Model::OptimizeGradientDescent(int64 cpu_budget, int64 ram_budget,
  ++i) {
  absl::flat_hash_map<string, double> gradients;
  new_output_time = OutputTime(snapshot, model_input_time, &gradients);
  - // We terminate once the improvement of the output latency is too small or
  - // the essential transformations' parallelism reaches the CPU budget or the
  - // worst-case total buffer size exceeds the memory budget.
  + // We also terminate once the improvement of the output latency is too
  + // small.
  if (std::abs(output_time - new_output_time) < kOptimizationPrecision) {
  break;
  }
  