Traceback (most recent call last):
  File "./faster_rcnn/train_net.py",line 23,in <module>
    from lib.fast_rcnn.train import get_training_roidb,train_net
  File "./faster_rcnn/../lib/__init__.py",line 1,in <module>
    import fast_rcnn
  File "./faster_rcnn/../lib/fast_rcnn/__init__.py",line 9,in <module>
    from . import train
  File "./faster_rcnn/../lib/fast_rcnn/train.py",line 18,in <module>
    from ..gt_data_layer import roidb as gdl_roidb
  File "./faster_rcnn/../lib/gt_data_layer/__init__.py",line 7,in <module>
    import roidb
  File "./faster_rcnn/../lib/gt_data_layer/roidb.py",line 11,in <module>
    import scipy.sparse
ImportError: No module named scipy.sparse

解决方法：

先执行

sudo yum install python-scipy

sudo pip install scipy