message: Update layout_optimizer.cc
  Place data format op on CPU:0.
diff: @@ -919,6 +919,7 @@ class NodeProcessor : public GraphProcessor {
  ParseNodeName(input_name, &port);
  if (IsHostMemory(*input, port)) {
  parsed_name.type = "CPU";
  + parsed_name.id = 0;
  device = DeviceNameUtils::ParsedNameToString(parsed_name);
  }
  }
  