how to find accuracy of KNN model ?
K nearest neighbour accuracy
Split the data on train test with general ratio being 80:20, Make predictions on those 20% of data using knn algorithm with those 80% as its training data. Than calculate accuracy on those 20% of predictions made by comparing them with actual predictions provided.
Hope this cleared your doubt. 
I want to know the code for checking accuracy in knn.
Assuming you are asking for classification problem you can simply use
print(np.mean(y_pred==y_test))
where y_test contains the actual truth values ( those 20% of data kept reserved with us) and y_pred contains the predicted values that you knn algorithm has predicted using the (80% of training data).
Hope this cleared your doubt.
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