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Design a real-time gaming leaderboard.

What are the differences between Ridge and Lasso, and how do they manifest?

What are the optimization algorithms that you have knowledge of? What are your tactics for optimizing a model that has a million variables? What’s the mechanism of the simplex technique in the context of optimization?

How do you explain overfitting and underfitting in machine learning, and what is their significance in the development of models?

Construct a system for handling real-time distributed data versioning.

Create a system for identifying fraudulent transactions.

What's your understanding of a minimum height tree, and how can it be created?

Create a friend recommendation engine for social media.

Can you elaborate on the concept of bias and variance as they pertain to decision trees? Also, which one poses more of a challenge: high bias or high variance, and why?

Design a system for managing a distributed time series database.