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Recommendations (Accuracy (precision, recall, hit ratio), Basic genre…
Recommendations
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Basic genre
Content-based
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Properties of items
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doocument
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similarity
Jaccard
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\(SIM(S,T)=\frac{{\mid}S{\cap}T{\mid}}{{\mid}S{\cup}T{\mid}}\)
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\(\cos\)
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\( \frac
{AB}
{\begin{Vmatrix}{A}\end{Vmatrix} {\cdot} \begin{Vmatrix}{B}\end{Vmatrix}}=
\frac
{\displaystyle\sum_{i=1}^{n}{A_i}{B_i}}
{\sqrt{\displaystyle\sum_{i=1}^{n}{{A_i}^2}}
{\sqrt{\displaystyle\sum_{i=1}^{n}{{B_i}^2}}}
}
\)
k-shingle
The quick brown fox jumps over the lazy dog
- The quick brown fox jumps
- quick brown fox jumps over
- brown fox jumps over the
- fox jumps over the lazy
- jumps over the lazy dog
signature
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minhash
Probability that \(h(S_1)=h(S_2)\)
=
\(SIM({S_1},{S_2})\)
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