text: Title: How to train a paired dataset
  Body: Hello, author.
  My dataset is paired, and I want to train it in pairs. I tried to input the parameter "--dataset_mode aligned", but I got an error message "AssertionError: ./datasets/underwater\train is not a valid directory". The format of my dataset is shown in the following figure. Could you please tell me how to place the paired data for training?
  
  ![Image](https://github.com/user-attachments/assets/d0f48082-596d-4198-9488-e2627c79243a)
  