where is the self.img_enc.train() and self.img_enc.eval()

[sharontaozi]

Hi,when I looked at the code I found in train_vtt.py,there is a code"model.train_start()"be used. And "model.train_start()" is delimit in the model.py,and there is a code"self.img_enc.train()"，but I can't find where is the img_enc.train() (EncoderImage.train()) delimit.

Looking forward to your answer！