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Validation Accuracy is changing when the same classifier is trained on the same data

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Hello. I am using ensemble classifiers in the Matlab Classification Learner. The problem is that I am getting different accuracies when training the same classifier (Bagged Trees) on the same data.

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Accepted Answer

Walter Roberson
Walter Roberson on 19 Jan 2017
Most of the classifiers include random initialization. To repeat the same accuracy with the same classifier on the same data, set the random number seed each time, using rng()

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Mortada Haidar
Mortada Haidar on 19 Jan 2017
Ok I see. But then how can I assess the performance of my model? Validation accuracy is changing drastically when changing the seed..
Walter Roberson
Walter Roberson on 19 Jan 2017
In such a case you have to assume that there is a lot of over-fitting. Reduce the size of your training set and increase the size of your test set.

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