// Find the class that gives the maximum score

    float64_t score = 0, ypred = 0;
    float64_t max_score = df->dense_dot(feat_idx, w.vector, feats_dim);

    for ( int32_t c = 1 ; c < m_num_classes ; ++c )
    {
        score = df->dense_dot(feat_idx, w.vector+c*feats_dim, feats_dim);

        if ( score > max_score )
        {
            max_score = score;
            ypred = c;
        }
    }