Bias in Natural Actor-Critic Algorithms E[ t=0 γ t rt |s0 =s, θ]. Similarly, the state-action value ∞ function is Qθ (s, a) = E[ t=0 γ t rt |s0 =s, a0 =a, θ]. The discounted state distribution, dθ , gives the probability of each state when using policy ...
We show that several popular discounted reward natural actor-critics, including the popular NAC-LSTD and eNAC algorithms, do not generate unbiased estimates of the natural policy gradient as claimed. We derive the first unbiased discounted reward natural actor-critics using batch and iterative approache...
Thomas, P. (2014). Bias in Natural Actor-Critic Algorithms. ICML. Lillicrap, T., Hunt, J., Pritzel, A., Heess, N., Erez, T., Tassa, Y., Silver, D., & Wierstra, D. (2016). Continuous control with deep reinforcement learning. CoRR, abs/1509.02971. Haarnoja, T., Tang, H.,...
首先我想先谈一下我质疑楼上观点的原因，ppt里not unbiased后面其实有一个括号（if the critic is not...
Simultaneously, in order to improve the sampling efficiency of the algorithm, we propose an improved prioritized experience replay mechanism by modifying the priority definition instead of the original random sampling. Experiments show that, compared with two state-of-the-art algorithms, our algorithm ...
Actor Critic (AC) 算法的bias来源于两点：Sampling distribution带来的bias Critic estimation带来的bias 1...
AC is biased 注意baseline要求是只与state相关，才可证是unbiased。而AC里，E[γV(st+1)−V(st)...