# Kernel shut down when use FindFaces with LBP Cascades

I found Mathematica can use OpenCV to improve face recognition in FindFaces: how to improve the results of the face recognition feature.

But I tried this way and the kernel crashed.

URLDownload["https://raw.githubusercontent.com/nagadomi/lbpcascade_animeface/master/lbpcascade_animeface.xml","lbpcascade_animeface.xml"];


Then I found that even using the files in the distribution will still cause kernel shut down.

Notice that the number disappears, the code highlight disappears, the calculation does not continue, the kernel has stopped working at this time.

Can someone else reproduce this situation, is this a bug?

• I observe the same behaviour ("11.3.0 for Linux x86 (64-bit) (March 7, 2018)") – mikado Sep 23 '18 at 11:33
• Same on 11.3.0 for Mac OS X x86 (64-bit) (March 7, 2018) – Rohit Namjoshi Sep 24 '18 at 1:49
• This should be reported to Wolfram Support, please share then the case number so other people get a chance to follow up when new versions are released. – rhermans Oct 25 '18 at 10:20
• @rhermans Re: [CASE:4169085] I was able to reproduce the crash, however TrainingFile is not documented and not supported. – GalAster Oct 25 '18 at 10:49
• Seems undocumented functions cannot get support. – GalAster Oct 25 '18 at 10:49

OpenCV Error: Unspecified error (The node does not represent a user object (unknown type?)) in cvRead, file /home/usr0/matthias/tmp/opencv/opencv-3.1.0/modules/core/src/persistence.cpp, line 4976