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We need to
compute the difference
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between the energy of the whole
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network when i
is on and the
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energy when i is
off.
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Then the posterior probability
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for
i is:
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Changing the
state of i changes
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two kinds of
energy term:
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how
well the parents of i
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predict
the state of i
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How
well i and its spouses
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predict
the state of each
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descendant
of i.
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