error about python scripts/train.py --mode mat

[leijue222]

Traceback (most recent call last): File "scripts/train.py", line 270, in <module> main(sys.argv[1:]) File "scripts/train.py", line 237, in main config.img_alpha_weight_dir) File "scripts/train.py", line 74, in setup_dataset train_raw, test_raw = datasets.split_dataset(dataset) File "G:\github\portrait_matting\scripts\datasets\common.py", line 18, in split_dataset seed=seed) File "E:\Anaconda\envs\portraitMatting\lib\site-packages\chainer\datasets\sub_dataset.py", line 132, in split_dataset_random return split_dataset(dataset, first_size, order) File "E:\Anaconda\envs\portraitMatting\lib\site-packages\chainer\datasets\sub_dataset.py", line 102, in split_dataset raise ValueError('split_at exceeds the dataset size') ValueError: split_at exceeds the dataset size