shap

When to use it

Trigger this skill when users ask about:

• "Explain which features are most important in my model"
• "Generate SHAP plots" (waterfall, beeswarm, bar, scatter, force, heatmap, etc.)
• "Why did my model make this prediction?"
• "Calculate SHAP values for my model"
• "Visualize feature importance using SHAP"
• "Debug my model's behavior" or "validate my model"
• "Check my model for bias" or "analyze fairness"
• "Compare feature importance across models"
• "Implement explainable AI" or "add explanations to my model"
• "Understand feature interactions"
• "Create model interpretation dashboard"

Mistakes to avoid

Issue: Wrong explainer choice

Problem: Using KernelExplainer for tree models (slow and unnecessary) Solution: Always use TreeExplainer for tree-based models

Issue: Insufficient background data

Problem: DeepExplainer/KernelExplainer with too few background samples Solution: Use 100-1000 representative samples

Issue: Confusing units

Problem: Interpreting log-odds as probabilities Solution: Check model output type; understand whether values are probabilities, log-odds, or raw outputs

Issue: Plots don't display

Problem: Matplotlib backend issues Solution: Ensure backend is set correctly; use plt.show() if needed

Issue: Too many features cluttering plots

Problem: Default max_display=10 may be too many or too few Solution: Adjust max_display parameter or use feature clustering

Issue: Slow computation

Problem: Computing SHAP for very large datasets Solution: Sample subset, use batching, or ensure using specialized explainer (not KernelExplainer)