What is the risk of using the same data for both training and testing in a Machine Learning model?

  • Increase in accuracy; Reduction in bias
  • Increase in complexity; Reduction in training time
  • Reduction in training time; Increase in bias
  • Risk of overfitting; Unrealistic performance estimates
Using the same data for training and testing leads to the risk of overfitting and provides unrealistic performance estimates. The model will have seen all the data during training, so it might not generalize well to new, unseen instances.
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