Ensemble de données déséquilibré

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Imbalanced Dataset

 Imbalanced datasets are those where the target attribute (the attribute to be predicted) is unevenly distributed. This is definitely not an uncommon scenario while working on data science problems. For example, predicting fraudulent credit card transactions is an excellent example of an imbalanced dataset. Because most of the credit card transactions would be genuine. Yet there are some fraudulent transactions as well.

The imbalanced datasets need special attention as the normal approach to building models or evaluating performance would not work. Here is an article that talks in detail about imbalanced datasets and the best approaches to handle them better.

Source : towardsdatascience