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issue trainHog sample

I'm trying to train inria dataset with this sample but i don't know what is the problem cause when it gets to this i receive the assert? What i'm doing wrong?

clog << "Histogram of Gradients are being calculated for negative images..."; computeHOGs(pos_image_size, neg_lst, gradient_lst, flip_samples); size_t negative_count = gradient_lst.size() - positive_count; labels.insert(labels.end(), negative_count, -1); CV_Assert(positive_count < labels.size()); ?

issue trainHog sample

I'm trying to train inria dataset with this sample but i don't know what is the problem cause when it gets to this i receive the assert? What i'm doing wrong?

 clog << "Histogram of Gradients are being calculated for negative images...";
        computeHOGs(pos_image_size, neg_lst, gradient_lst, flip_samples);
        size_t negative_count = gradient_lst.size() - positive_count;
        labels.insert(labels.end(), negative_count, -1);
        CV_Assert(positive_count < labels.size()); ?

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