I have successfully run the mxnet on Mnist dataset using the python scripts in the example. However, when running the ImageNet example, error occured. First I run the data.py (this is normal without error) and then alexnet.py , error prompted announcing that Segmentation fault (core dumped).

In the data.py, what is the data structure of " path_imgrec= "data/ilsvrc12/train.rec" ", and how to generate the data ? What should be done before running alexnet.py on ImageNet Dataset ?