Loading finetuned model to generate text

thank you for your answer, but i have a question for you
I validate the model as I train it, and save the model with the highest scores on the validation set using torch.save(model.state_dict(), output_model_file). As shown in the figure below

Then I trained again and loaded the previously saved model instead of training from scratch, but it didn’t work well, which made me feel like it wasn’t saved or loaded successfully?
model.load_state_dict(torch.load(output_model_file))

My model code is here