Issues in IO Image Notebooks

[kevinthesun]

Some issues in io image notebooks:

1. In record_io.ipynb cell No.9:

s = mx.recordio.pack_img(header, data, quality=100, img_fmt='.jpg')

results in segmentation fault.

2. In advanced_img_io.ipynb cell No.9:

img = cv2.imread('test_images/ILSVRC2012_val_00000001.JPEG', flags=1)

results in segmentation fault. I searched this online and found it might be an opencv bug.

3. In image_io.ipynb cell No.5: MXNetError: [07:28:27] src/io/input_split_base.cc:163: Check failed: files_.size() != 0U (0 vs. 0) Cannot find any files that matches the URI patternz ./data/caltech_train.rec

All these tests were run on AMI Ubuntu. I also rebuilt mxnet using updated github version. @piiswrong Any idea?

[kevinthesun]

For the third issue, the reason is "./data/caltech_train.rec" has changed to "./data/caltech.rec"