the statement in line 78 should be repalced

[shifengren]

"hbias[i] += lr * (ph_mean[i] - nh_means[i]) / N" is my modification.

[Futuroscope]

Why you put dataes such as "int N; int n_in; int n_out; double **W; double *b;" in public,why not in protected or private?