message: [tf.data] Add comments for the input time computation in the InterleaveMany node.
diff: @@ -59,6 +59,11 @@ class InterleaveMany : public Node {
  (*input_times)[long_name()] = old_input_time;
  return;
  }
  + // Here `old_input_time + SelfProcessingTimeLocked()` is the average input
  + // time for the interleave node to call one of the `(num_inputs() - 1)`
  + // input nodes(except the first one) to return an element. Regardless of the
  + // `block_length` parameter of interleave node, the average input time for
  + // any of the `(num_inputs() - 1)` input nodes to be called is computed as:
  double new_input_time = (old_input_time + SelfProcessingTimeLocked()) *
  static_cast<double>(num_inputs() - 1);
  (*input_times)[long_name()] = new_input_time;
  