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2024-03-26
tive ita based similarity similar classification year ofsimilarity 机器 manohorse
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e-Chapter 6
Similarity-Based Methods
“It’s a manohorse”, exclaimed the confident little
5 year old boy. We call it the Centaur out of habit,
but who can fault the kid’s intuition? The 5 year old
has never seen this thing before now, yet he came up
with a reasonable classification for the beast. He is us-
ing the simplest method of learning that we know of
– similarity – and yet it’s effective: the child searches
through his history for similar objects (in this case a
man and a horse) and builds a classification based on
these similar objects.
The method is simple and intuitive, yet when we
get into the details, several issues need to be addressed
in order to arrive at a technique that is quantitative
and fit for a computer. The goal of this chapter is to build exactly such a
quantitative framework for similarity based learning.
6.1 Similarity
The ‘manohorse’ is interesting because it requires a deep understanding of
similarity: first, to say


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