Error in vid_image_stats : vl_imreadjpeg

[YandanYang]

Undefined function or variable 'vl_imreadjpeg'.

Error in vid_image_stats (line 35)
        imgs = vl_imreadjpeg(files, 'numThreads', 12);

There seems to be no such a function vl_imreadjpeg defined neither in matlab nor in source code.
How do you fix it?

[ectg]

vl_imreadjpeg is part of matconvnet. This is not included in this repo.

[CXSunshine]

Attempt to execute SCRIPT vl_imreadjpeg as a function:/home/yang/matconvnet-1.0-beta25/matlab/vl_imreadjpeg.m？　
Ｈｏｗ can I sovle this？

[jvlmdr]

You may need to install (and possibly compile) vlfeat