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IFD:EAI SoS21/course material/Session 4: Programming the Classifier Part1: Difference between revisions
IFD:EAI SoS21/course material/Session 4: Programming the Classifier Part1 (view source)
Revision as of 21:51, 5 May 2021
, 5 May 2021→Description of the classifier code
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</syntaxhighlight> | </syntaxhighlight> | ||
Our classifier is written in a class called "KMeans" because it most closely resembles a KMeans classifier. | Our classifier is written in a class called "KMeans" because it most closely resembles a KMeans classifier. | ||
So inside the | So inside the "KMeans.cpp" you will find the guts of our classifier. You can see that, when the KMeans classifier gets instantiated (=the contructor is called), we feed it with the points and the class labels | ||
<syntaxhighlight lang="c++"> | <syntaxhighlight lang="c++"> | ||
KMeans::KMeans(vector<Point2D> & | KMeans::KMeans(vector<Point2D> &points, vector<int> &labels, int n_classes ) | ||
{ | { | ||
_n_classes = n_classes; | _n_classes = n_classes; | ||
| Line 50: | Line 50: | ||
int numPoints = 0; | int numPoints = 0; | ||
for(int i=0; i< | for(int i=0; i<points.size(); i++) | ||
{ | { | ||
if( | if(labels[i]==c) // see if point in points belongs to class c | ||
{ | { | ||
_centroids[c] = _centroids[c] + | _centroids[c] = _centroids[c] + points[i]; | ||
numPoints = numPoints + 1; | numPoints = numPoints + 1; | ||
} | } | ||
} | } | ||
// all points in | // all points in "points", that belong to the class c are added up | ||
// now, divide by num of points in class c | // now, divide by num of points in class c | ||
_centroids[c] = _centroids[c]/numPoints; | _centroids[c] = _centroids[c]/numPoints; | ||