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Don't look further, the answer is: The developer comments that the ml32i4.dll file is missing from the NETLink directory since version 12.1. Please find the dll file in link below. If you put an ml32i4.dll file in there, next to the existing...
For tecture LBP, Gabor and SIFT are a good starting point, and geometric (FAP) features, using Adaboost, mRMR and SVM feature selection algorithms could be helpfull.. Hoping it can help you..
**Problem solved.** That was due to the fact that ml.GetExpr was called more than once.