Thuật toán ID3 (Quinlan)
flowchart TD
p1(("Màu tóc"))
p2["Vàng"]
p3["Nâu"]
p4["Đỏ"]
p1-->p2
p1-->p3
p1-->p4
p5["(x)Sarah
Dana
(x)Annie
Katie"]
p6["Alex
Peter
John"]
p7["(x)Emily"]
p2-->p5
p3-->p6
p4-->p7
Entropy = 4/8[-2/4log2(2/4) -2/4log2(2/4)] + 3/8[-3/3log2(3/3)] + 1/8[-1/1log2(1/1)]
