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Could you explain the unique roles of a confusion matrix and an ROC curve in a model's performance evaluation?

Could you develop a Python function that applies a markdown to selected song streams?

What are the main steps one should follow during an ETL process? How do you optimize this process?

Can you give me the simplest way to find the shortest distance for a knight to move from A to B on an infinite chessboard?

If given a binary and continuous variable, what's your method to find the correlation between the two?

Discuss the difference between precision and recall in terms of their meaning and function in the context of classification models. Also, discuss some scenarios where these metrics may give misleading results or fail to provide useful information.

How would you design and test a metric to compare two user's Netflix recommended lists of movie/tv show preferences.

Design a video streaming service like Netflix.

Design a notification service.

Build an online system for targeted advertisements.