How can i get KNN classifier for test and training purpose?
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I want to study about KNN classifier and i would like to implement it..Where can i get source code..
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Star Strider
2017 年 3 月 8 日
If you do not have the Statistics and Machine Learning Toolbox and with it the knnsearch (link) function, a simple KNN classifier is straightforward to write.
The Code —
V = randi(50, 1, 3); % Vector — Create Data
M = randi(50, 15, 3); % Matrix — Create Data
dif = bsxfun(@minus, V, M); % Subtract Vector from Matrix
D2 = sqrt(sum(dif.^2,2)); % Euclidean Distance Metric
[Ds,Ix] = sort(D2,'ascend'); % Sort Ascending
k = 5; % Number Of Neighbours
KNN = M(Ix(1:k),:); % K-th Nearest Neighbours
This finds the ‘nearest neighbours’ in ‘M’ to the vector ‘V’. The data in ‘V’ and ‘M’ must have the same column size.
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Star Strider
2017 年 3 月 8 日
No. This is code I wrote earlier to illustrate how a k-th nearest neighbour classifier works.
The link I provided in my Answer is to the documentation for the MATLAB function. You must have the Statistics and Machine Learning Toolbox installed to use the knnsearch function.
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