assertTimeNotPassed(stopwatch, LONG_DELAY_MS);
  }

  public void testJoinNoInterrupt() {
    TimedThread thread = TimedThread.createWithDelay(20);
    thread.joinSuccessfully();
    assertNotInterrupted();
  }

  public void testJoinTimeoutNoInterruptNotExpired() {
    TimedThread thread = TimedThread.createWithDelay(20);
    thread.joinSuccessfully(LONG_DELAY_MS);
    assertNotInterrupted();
  }

*  Added `keras.utils.TimedThread` utility to run a timed thread every x seconds. It can be used to run a threaded function alongside model training or any other snippet of code.