Similarity-based Retrieval (cont)
Feature vectors ...
- often use multiple features, concatenated into single vector
- represent points in a very high-dimensional (vh-dim) space
Content of feature vectors depends on application ...
- image ... colour histogram (e.g. 100's of values/dimensions)
- music ... loudness/pitch/tone (e.g. 100's of values/dimensions)
- text ... term frequencies (e.g. 1000's of values/dimensions)
Query: feature vector representing one point in vh-dim space
Answer: list of objects "near to" query object in this space
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