Problem with calculating BoW vectors on own features about dbow3 HOT 7 OPEN

void calculateFeatures(PointInTPtr& in, PointInTPtr& keypoints, NormalTPtr& normals, cv::Mat& features)
    {
        // Calculate features
        ...

        cv::Mat features_tmp (fpfhs->points.size(), dimensionality, CV_32F);

        for(size_t j = 0; j < fpfhs->points.size(); j++)
        {
            for(int idx = 0; idx < dimensionality; idx++)
            {
                features_tmp.at<float>(j, idx) = fpfhs->points[j].histogram[idx];
            }
        }

        features = features_tmp.clone();
    }

void loadFeatures(std::string path, cv::Mat& features)
    {
        // Load descriptors from the file
        ...

        features.create(features_cloud->points.size(), dimensionality, CV_32F); // CV_32FC1

        for(size_t j = 0; j < features_cloud->points.size(); j++)
        {
            for(int idx = 0; idx < dimensionality; idx++)
            {
                features.at<float>(j, idx) = features_cloud->points[j].histogram[idx];
            }
        }

    }

cv::Mat frame_features;
feature_estimator->calculateFeatures(sample_cloud, keypoints, normals, frame_features);
training_features[i] = frame_features.clone();
...
}
else
{
cv::Mat frame_features;
feature_estimator->loadFeatures(descr_file, frame_features);
training_features[i] = frame_features.clone();