Introduction to Information Retrieval
Introduction to Information Retrieval
Introduction to Information Retrieval
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<strong>Introduction</strong> <strong>to</strong> <strong>Information</strong> <strong>Retrieval</strong><br />
Cosine: Example<br />
log frequency weighting<br />
term SaS PaP WH<br />
AFFECTION<br />
JEALOUS<br />
GOSSIP<br />
WUTHERING<br />
3.06<br />
2.0<br />
1.30<br />
0<br />
2.76<br />
1.85<br />
0<br />
0<br />
2.30<br />
2.04<br />
1.78<br />
2.58<br />
log frequency weighting &<br />
cosine normalization<br />
term SaS PaP WH<br />
AFFECTION<br />
JEALOUS<br />
GOSSIP<br />
WUTHERING<br />
0.789<br />
0.515<br />
0.335<br />
0.0<br />
0.832<br />
0.555<br />
0.0<br />
0.0<br />
0.524<br />
0.465<br />
0.405<br />
0.588<br />
• cos(SaS,PaP) ≈<br />
0.789 ∗ 0.832 + 0.515 ∗ 0.555 + 0.335 ∗ 0.0 + 0.0 ∗ 0.0 ≈ 0.94.<br />
• cos(SaS,WH) ≈ 0.79<br />
• cos(PaP,WH) ≈ 0.69<br />
• Why do we have cos(SaS,PaP) > cos(SAS,WH)?<br />
47
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