what are prerequisites and steps for running fastercnn.pytorch?

[TengFeiHan0]

initially, I planned to run faster-rcnn.pytorch firstly before testing your whole project. Then I download all required datasets(KITTI_Tracking), put them into corresponding dirs and generate soft links.

1. run ./init.sh,some new dir and links were built.
2. modify some options in ./run_train.sh(for example, DATASET="kitti")
   3. sh ./run_train.sh got an error as follows:
   
   as I guess, it means no inputs have been loaded. However, I don't make any modifications to faster-rcnn. if possible, any cues would be highly appreciated.