Implement decision tree from scratch
Last updated: May 14, 2026
Quick Overview
Write a clean implementation of k-means without using ML libraries.
Supabase
May 14, 20264
4
333 solved
Write a clean implementation of k-means without using ML libraries.
This ML question from Supabase's Phone Screen goes beyond textbook definitions. The interviewer wants to see how you reason about model selection, evaluation metrics, and the practical challenges of deploying ML in production.
What the Interviewer Expects
- Explain the concept clearly with intuitive examples
- Discuss when and why to use this technique
- Identify common pitfalls and how to avoid them
- Compare with alternative approaches at a high level
Key Topics to Cover
How to Approach This
- Understand the bias-variance trade-off. High training accuracy but low test accuracy signals overfitting.
- Choose evaluation metrics carefully based on the problem. Accuracy alone is often insufficient.
- Feature engineering is often more impactful than model selection.
- Know when to use tree-based models (tabular data) vs neural networks (unstructured data).
- Handle class imbalance with SMOTE, class weights, or appropriate loss functions.
Possible Follow-up Questions
- What are the computational costs of this approach at scale?
- When would you prefer a simpler model over a complex one?
- What regularization technique would you use and why?
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Explore ML Interview PrepSample Answer
Core Concept Explanation
Start with a clear, intuitive explanation of the concept. Use analogies when helpful. Then go deeper into the mathematical foundations: **Key Intuiti...
Practical Application
**When to use**: Describe the scenarios where this technique is most effective. What data characteristics favor it? **When NOT to use**: Common pitfa...
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