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We can specify
targets in
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several ways:
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Specify
desired final
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activities
of all the units
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Specify
desired activities
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of
all units for the last few
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steps
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Good
for learning attractors
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It is
easy to add in extra
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error
derivatives as we
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backpropagate.
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Specify
the desired activity
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of
a subset of the units.
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The
other units are hidden
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