<math>\min_{\omega,\theta,\theta'} \sum_{i=0}^{T-1}w(\boldsymbol{x}_t)|\phi(\boldsymbol{x}_t)-g_{\theta'}(\phi(\boldsymbol{x}_{t+1}))|^2 | <math>\min_{\omega,\theta,\theta'} \sum_{i=0}^{T-1}w(\boldsymbol{x}_t)|\phi(\boldsymbol{x}_t)-g_{\theta'}(\phi(\boldsymbol{x}_{t+1}))|^2 |