# What does this symbol means, what operator is it?

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.

## 1 Answer

$$\mathbb{E}$$ means expected value.

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