Demystifying AI · Stage 2
Vectors
A vector is an ordered list of numbers, like (3, 4). Picture it as an arrow: 3 across and 4 up. Vectors add piece by piece, (1, 2) + (3, 4) = (4, 6), and the length of (3, 4) is 5 by Pythagoras. In AI almost everything (a word, an image, a user) is turned into a vector, often with hundreds or thousands of numbers.
Why it matters: Models only work with numbers, and vectors are how words and images become numbers.
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Vectors | Chapter 1, Essence of linear algebra
The arrow picture and the list-of-numbers picture, side by side. · 3Blue1Brown
Pirate Vector Addition Adventure (game)
Practise adding vectors.
Pirate Vector Coordinate Adventure (game)
Practise reading vector coordinates.
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