juniorClassification
What is train-test split in classification?
Updated May 15, 2026
Short answer
Train-test split divides data into training and evaluation sets.
Deep explanation
It ensures unbiased evaluation by testing model performance on unseen data.
Real-world example
Evaluating a fraud detection model before deployment.
Common mistakes
- Testing on training data leading to inflated performance.
Follow-up questions
- What is cross-validation?