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

2017 1 19
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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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Walter Roberson
Walter Roberson 2017-1-19

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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 2017-1-19
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 2017-1-19
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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