message: Avoid counting ops execution time twice in StatSummarizer.
diff: @@ -146,6 +146,15 @@ void StatSummarizer::ProcessStepStats(const StepStats& step_stats) {
  ds.device().find("/stream:all") == std::string::npos) {
  continue;
  }
  + // NOTE(fishx): We will record ops execution time twice: one as CPU
  + // activity with device name "/host:CPU" and the other as TF runtime
  + // activity with device name started with "/job:*". It is safe to ignore
  + // CPU activties here.
  + // TODO(b/138729463): Read ops execution time from CPU activities instead
  + // of runtime acitivities.
  + if (ds.device().find("/host:CPU") != std::string::npos) {
  + continue;
  + }
  std::string name = ns.node_name();
  std::string op_type = "<>";
  