Function AddInput

tensorflow/core/graph/graph_partition.cc:1021–1029

Add an input to dst that comes from the "src_slot" output of the node named by "src_name".

// Add an input to dst that comes from the "src_slot" output of the
// node named by "src_name".
void AddInput(NodeDef* dst, StringPiece src_name, int src_slot) {
  if (src_slot == Graph::kControlSlot) {
    dst->add_input(strings::StrCat("^", src_name));
  } else if (src_slot == 0) {
    dst->add_input(src_name.data(), src_name.size());
  } else {
    dst->add_input(strings::StrCat(src_name, ":", src_slot));
  }
}

// Each participating device needs to decide a) if there is a next iteration,
// and b) if the loop terminates. We take the approach to encode this control