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The space has
one axis for
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each training
case.
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So the vector of
target values
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is a point in the
space.
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Each vector of
the values of
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one component of
the input is
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also a point in
this space.
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The input
component vectors
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span a subspace,
S.
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A
weighted sum of the
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input
component vectors
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must
lie in S.
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The optimal
solution is the
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orthogonal
projection of the
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vector of target
values onto S.
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