code: def user_code():
      epochs = 20
  
      val_acc = 0
      batch_size = 32
      for epoch in range(epochs):
          # Training
          time.sleep(1)
          val_acc += 0.5
          metrics = (
              "epoch: {}, val accuracy: {:.2f}, batch size: {}".format(
                  epoch, val_acc, batch_size
              )
          )
          sdk_send_data(metrics)
  
label_desc: Use image node_id 2 for calling a global function with example usage: user_code() without return types