midKeras
What is a callback in Keras?
Updated May 16, 2026
Short answer
Callbacks are functions executed during training.
Deep explanation
They allow monitoring, logging, early stopping, and dynamic adjustments during training.
Real-world example
Stopping training when validation loss increases.
Common mistakes
- Not using callbacks in long training jobs.
Follow-up questions
- What are common callbacks?
- Can callbacks modify training?