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Using (pseudo-)random numbers and the Law of Large Numbers to simulate the random behavior of a real system.

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Monte Carlo Gradient Estimator [closed]

How do we derive this Monte Carlo Estimator? \begin{equation} \nabla_{\phi}\mathbb{E}_{q_{\phi}(z)}[f(z)] = \mathbb{E}_{q_{\phi}(z)}[f(z) \nabla_{q_{\phi}(z)}\ln q_{\phi}(z)] \end{equation}