Các độ đo tương tự trong khai phá dữ liệu

Similarity measures in data mining

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Trong khai phá dữ liệu, ta thường dùng các độ đo tương tự để đánh giá mức độ tương tự (Similarity) của 2 đối tượng để thực hiện các thao tác tiếp theo cho phù hợp với từng đối tượng (như gom các đối tượng có sự tương tự cao vào cùng nhóm chẳng hạn).

• Similarity(X,Y) = 1 if X = Y         (X, Y là 2 đối tượng)
• Similarity(X,Y) = 0 if X ≠ Y

Bài viết này giới thiệu cách tính các độ đo tương tự phổ biến như Euclidean distance, Cosine, Manhattan, Jaccard… bằng Python.

Euclidean distance

Manhattan distance:

p (x1, y1), p2(x2, y2).

Manhattan distance (p1,p2) = |x1 – x2| + |y1 – y2|

Cosine similarity

Jaccard similarity

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