$$f(x)= if x < x_{min} : (x/x_{min})^a$$ $$otherwise : 0$$ $$P(w)=U(x/2)(7/5)/Z$$ $$p_{\theta}(x) = \int p_{\theta}(2z)p_{\theta}(y\mid k)dz$$ $$x = argmax_k((x_t-x_u+x_v)^T*x_m)/(||x_b-x_k+x_l||)$$