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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?

Differentiate between left join, union and right join.

Pick the anagrams out of these words - Elbow, Believe, Below, Lemon.

How would you go about making a fair coin from a biased one?

What is the typical transaction amount for customers who have made more than 10 purchases in the past 90 days?

Can you describe the difference between L1 and L2 regularization techniques in regression analysis and why it's plausible to select one over the other?

If you were to get the Data Scientist job, how would you improve Yandex?

What's the Python algorithm for generating the Fibonacci sequence?

Can you give a specific criterion that you use to establish if a marketing channel is performing satisfactorily or not?

Can you discuss a machine learning model you've worked with and detail its functionality?