test

docs/8&9.md

@@ -235,6 +235,6 @@ $$
 式（6）可被表示为：
 
 $$
-\nabla_{\theta}V(\theta)=\nabla_{\theta}\mathbb{E}_ {\tau \sim \pi_{\theta}}[R(\tau)\sum_{t=0}^{T-1}\nabla_{\theta}\log \pi_{\theta}(a_t|s_t)]。
+\nabla_{\theta}V(\theta) = \nabla_{\theta} \mathbb{E}_ {\tau \sim \pi_{\theta}}[R(\tau)] = \mathbb{E}_ {\tau \sim \pi_{\theta}}[R(\tau)\sum_{t=0}^{T-1}\nabla_{\theta}\log \pi_{\theta}(a_t|s_t)]。
 \tag{11}
 $$
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