multi_thread----ValueError: need more than 2 values to unpack

[ArsenLuca]

When I set multi_thread to True in train_cityscapes.cfg, error happens as below:

File "/home/xxx/anaconda2/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/home/xxx/anaconda2/lib/python2.7/multiprocessing/process.py", line 114, in run
self._target(*self._args, **self._kwargs)
File "/home/xxx/TuSimple-DUC/tusimple_duc/core/cityscapes_loader.py", line 83, in _worker
index, image, label = CityLoader._get_single(item, input_args)
ValueError: need more than 2 values to unpack

But when multi_thread is False, no error happens.

[GrassSunFlower]

fixed by latest commit.