python cosine similarity

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showing results for - "python cosine similarity"
Fred
12 Jan 2018
1from scipy import spatial
2
3dataSetI = [3, 45, 7, 2]
4dataSetII = [2, 54, 13, 15]
5result = 1 - spatial.distance.cosine(dataSetI, dataSetII)
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Jona
25 Nov 2016
1# Example function using numpy:
2from numpy import dot
3from numpy.linalg import norm
4
5def cosine_similarity(list_1, list_2):
6	cos_sim = dot(list_1, list_2) / (norm(list_1) * norm(list_2))
7    return cos_sim
8# Note, the dot product is only defined for lists of equal length. You
9#	can use your_list.extend() to add elements to the shorter list
10
11# Example usage with identical lists/vectors:
12your_list_1 = [1, 1, 1]
13your_list_2 = [1, 1, 1]
14cosine_similarity(your_list_1, your_list_2)
15--> 1.0 # 1 = maximally similar lists/vectors
16
17# Example usage with opposite lists/vectors:
18your_list_1 = [1, 1, 1]
19your_list_2 = [-1, -1, -1]
20cosine_similarity(your_list_1, your_list_2)
21--> -1.0 # -1 = maximally dissimilar lists/vectors
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Valery
29 Mar 2017
1from numpy import dot
2from numpy.linalg import norm
3
4def cosine_similarity(list_1, list_2):
5  cos_sim = dot(list_1, list_2) / (norm(list_1) * norm(list_2))
6  return cos_sim
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