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May someone explains some first iterations of this sigma?

enter image description here

Also, how did it convert the above expression to below expression? What it the meaning of I(x) and I(y)?

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closed as off-topic by Ben N Jul 22 '18 at 21:49

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about artificial intelligence, within the scope defined in the help center." – Ben N
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