maybe a error

[sure2003]

RBM.cpp for(int i=0; i<n_hidden; i++) { for(int j=0; j<n_visible; j++) {
W[i][j] += lr * (ph_mean[i] * input[j] - nh_means[i] * nv_samples[j]) / N; }

// hbias[i] += lr * (ph_sample[i] - nh_means[i]) / N;    //maybe error
hbias[i] += lr * (ph_mean[i] - nh_means[i]) / N;          // correct

}