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I have successfully trained several LBP cascades for hand pose determination and often during training I would experience the "hanging" you describe. My guess is that the discrimination power you are demanding from the cascade at each stage cannot be achieved given the method and your data. I would tweak my input parameters until success. This probably means you should try lowering you minhitrate and nstages. Also, the conventional wisdom states that you should have significantly more negatives than positives. The relative sizes of your training set examples might be untenable. Hope that helps.