28. Introduction to Model Evaluation
Model evaluation is a crucial phase in the AI life cycle that assesses how well machine learning models learn from data and make predictions. It is pivotal to check for accuracy, avoid overfitting, compare models, and improve performance. Techniques like hold-out validation and cross-validation, along with metrics such as accuracy, precision, recall, and F1 score, are essential for ensuring models are effective and reliable.
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What we have learnt
- Model evaluation is essential for checking how well a machine learning model performs.
- Data is split into training, validation, and test sets to ensure fair evaluation.
- Techniques like hold-out validation and cross-validation help us test model performance.
- Metrics such as accuracy, precision, recall, F1 score, and confusion matrix are used to assess models.
- A good model should not overfit or underfit.
- Model evaluation ensures that we deploy reliable and effective AI systems.
Key Concepts
- -- Model Evaluation
- The process of assessing how well a machine learning model can make predictions based on training data.
- -- Training Set
- The portion of data used to train a model.
- -- Validation Set
- An optional dataset used to fine-tune the model's hyperparameters.
- -- Test Set
- The dataset used to evaluate the final performance of a trained model.
- -- Overfitting
- A modeling error when a model captures noise in the training data rather than the intended outputs.
- -- Underfitting
- A situation where a model is too simplistic to learn the underlying patterns in the data.
- -- F1 Score
- The harmonic mean of precision and recall, useful for measuring a test's accuracy.
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