Policy Gradient Algorithms
<!-- Abstract: In this post, we are going to look deep into policy gradient, why it works, and many new policy gradient algorithms proposed in recent years: vanilla policy gradient, actor-critic, off-policy actor-critic, A3C, A2C, DPG, DDPG, D4PG, MADDPG, TRPO, PPO, ACER, ACTKR, SAC, TD3 & SVPG. --> <p><span class="update">[Updated on 2018-06-30: add two new policy gradient methods, <a href="#sac">SAC</a> and <a href="#d4pg">D4PG</a>.]</span> <br/> <span class="update">[Updated on 2018-09-30: add a new policy gradient method, <a href="#td3">TD3</a>.]</span> <br/> <span class="update">[Updated on 2019-02-09: add <a href="#sac-with-automatically-adjusted-temperature">SAC with automatically adjusted temperature</a>].</span> <br/> <span c
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