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Here is a mathematical description of the bernoulli naive bayes taken from the book ,Bayesian Reasoning and Machine Learning by David Barberenter image description here

i want to know what does the notation below means ? enter image description here

if someone could help me explane this notation and help me to be able to read it well and know what it means for futur references , it would be appreciated

Thanks!

Marah Ayoub
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  • This is the [indicator function](https://en.wikipedia.org/wiki/Indicator_function) notation. It evaluates to 1 if the proposition inside is true, and 0 if false. – Arya McCarthy Sep 29 '21 at 20:25

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