| The Energy of a joint configuration |
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| binary
state of unit i in joint |
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| configuration
alpha, beta |
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| bias
of |
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| unit i |
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| weight
between |
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| units i and
j |
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| Energy
with configuration |
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| alpha
on the visible units |
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| and
beta on the hidden |
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| units |
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| indexes
every non-identical |
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| pair of i
and j once |
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