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Workshop: The Future of Web Search

Music of the (p)Spheres

author: Alessandro Panconesi, University of Rome

Description

This lecture is talking about Nearest Neighbours Once upon a time... Musica universalis or music of the spheres is a medieval
philosophical concept that regards the proportions in the movements of
the celestial bodies - the Sun, Moon and planets - as a form of musica,
the medieval Latin name for music. This music was not thought of as
an audible sound, but simply as a mathematical concept. The Greek
philosopher Pythagoras was frequently credited with originating the
concept, which stemmed from his semi-mystical, semi-mathematical
philosophy and its associated system of numerology of
Pythagoreanism.
Some Surat Shabda Yoga, Satgurus considered the
music of the spheres to be a term synonymous with the Shabda or the
Audible Life Stream in that tradition, because they considered
Pythagoras to be a Satguru as well.

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Slides
0:00 The Music of the (p) Spheres
0:19 Nearest Neighbours
0:26 Nearest Neighbours
2:42 Nearest Neighbour - Euclidean distance - Cosine similarity
3:04 Random Clustering
3:17 Random Clustering
5:03 P-spheres
5:45 Once upon a time
6:32 P-spheres
7:02 P-spheres
7:12 P-spheres
7:29 P-spheres
7:52 P-spheres
8:05 P-spheres
8:09 P-spheres
8:53 Rank Aggregation
9:19 Rank Aggregation
9:39 Project docs on a random line
9:45 Project query: closest doc gets one vote
10:05 Repeat with a set of random lines
10:29 Elections
11:18 Evaluation
11:23 Competitive Recall
11:59 Competitive Recall
12:12 Competitive Recall
12:30 Competitive Recall
12:41 Competitive Recall
13:04 Competitive Similarity
13:21 Competitive Similarity
13:39 The dataset
14:04 What we measure
14:25 Points of Interest
15:47 Random Clustering: 1 level of recursion is best
17:38 Random Clustering: Centroids are best
17:57 P-Spheres vs Random Clustering
18:00 Quality vs Computational Effort
18:56 Space:the Final Frontier
19:32 The Bottomline
20:11 Rank Aggregation
20:16 Rank Aggregation vs Random Clustering
20:57 Possible Explanation
21:52 Future Directions
22:50 A Challenge

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