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In decision trees, what's the significance of bias and variance? Furthermore, which one presents a bigger issue - high bias or high variance - and what's the justification for that?

Design a system for real-time face recognition.

What are some real-world applications of dimensionality reduction, and how has it impacted various industries?

What do you know about Least Recently Used (LRU) caches?

What's the procedure for producing 1000 normally distributed samples with mean=x and variance=y in R, conducting a summary statistical analysis, and graphing a density plot? Implement the equivalent in Python via the Codility online editor.

Design a system for real-time bidding in online advertising.

How do information theory principles aid in evaluating different language models? Could you give a practical example of such an evaluation?

Could you share your experience with a particular machine learning model and explain its mechanics?

Build a system to manage a social media newsfeed.

Build a distributed system for executing chaos engineering experiments.