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@@ -141,9 +141,7 @@ $$\begin{aligned}
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-\frac{\partial E_{\boldsymbol{\theta}}}{\partial \boldsymbol{\theta}} & = -\frac{\partial \mathbb{E}_{\boldsymbol{x} \sim \pi}\left[\left(V^\pi(\boldsymbol{x})-V_{\boldsymbol{\theta}}(\boldsymbol{x})\right)^2\right]}{\partial \boldsymbol{\theta}}\\
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\end{aligned}$$
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-将
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-
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-$V^\pi(\boldsymbol{x})-V_{\boldsymbol{\theta}}(\boldsymbol{x})$
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+将$V^\pi(\boldsymbol{x})-V_{\boldsymbol{\theta}}(\boldsymbol{x})$
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看成一个整体，根据链式法则（chain rule）可知
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$$-\frac{\partial \mathbb{E}_{\boldsymbol{x} \sim \pi}\left[\left(V^\pi(\boldsymbol{x})-V_{\boldsymbol{\theta}}(\boldsymbol{x})\right)^2\right]}{\partial \boldsymbol{\theta}}=\mathbb{E}_{\boldsymbol{x} \sim \pi}\left[2\left(V^\pi(\boldsymbol{x})-V_{\boldsymbol{\theta}}(\boldsymbol{x})\right) \frac{\partial V_{\boldsymbol{\theta}}(\boldsymbol{x})}{\partial \boldsymbol{\theta}}\right]$$
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)s