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loss fuction of Generative Adversarial Networks

I am confused about the $E_{x\sim P_{data}(x)}$, what does $E$ means here. I cannot find an appropriate answer on the internet, and hence I am trying data science stack exchange. Please help.

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$\mathbb{E}$ means expected value.

The subscript is there to clarify which random variable is the expected value taken.

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