I extracted feature from emg signal and when i classify it by below methods:
1-classification app: During classifcation classifier and accuracy change every time. like when i classify first time it show fine SVM give 70% accuracy and next time when I classify it then it show highest accuracy at 60% by KNN.
2- Secondly, I used nnstart app, it also show different accuracy of same data at different times.
Kindlly explain me its reason.