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Tell me about a time when you mentored someone

Can you describe the purpose and interpretation of an ROC curve in model evaluation? How would you contrast bagging with boosting in ensemble learning?

Can you discuss the properties of DMatrix in XGBoost and compare it with other data structures used in the field of gradient boosting?

Characters A, B, C, D are linked such that A is linked to B, A is linked to C, C is linked to D, and B is linked to D. Can these four characters be separated into two sets such that the graph is bipartite?

In R, how can you generate a dataset of 1000 normally distributed points with mean=x and variance=y, provide summary statistics, and plot the density? Also, replicate these steps in a Python script within Codility's editor.

How do you go about earning trust in a team?

Would you change anything to make Taboola better?

How do you locate the top 5 most frequently sold items from a list of order histories?

If you took a risk, tell me about it.

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