Missing validation data download link

[wowowowowoo]

Hi, I downloaded the dataset from the given link (Readme, section "Training the Semantic Line Detection ModelTraining the Semantic Line Detection Model", point 1). However, the link only provide me the training data. And when I ran the code ”train.pyextractFilenameList.py“，it only created "agroNav_LineDetection_train.txt"
and there was not "agroNav_LineDetection_val.txt"
Where can I do to solve these problems?