XGBoost

XGBoost shines in complex chatbot applications where high performance and the ability to handle unbalanced classes are critical, although it may require more training data and time to reach its full potential.

Use Case for Chatbots:
XGBoost is suitable for complex chatbot applications requiring high performance and the ability to handle unbalanced classes.

Training Data Needed:
Requires a medium to large dataset, typically at least 30-50 samples per intent for best results.

Training Time:
Although it takes longer to train compared to Logistic Regression, the performance benefits are often worth the extra time.

Preferred Vectorizers:
Pairs well with more sophisticated vectorizers like FastText.

Preprocessing Requirements:
Minimal preprocessing is usually required, but feature scaling can often improve performance.