Multi-Arm Bandits for recommendations and A/B testing on Amazon ratings data set

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Multi-Arm Bandits is used by many companies like Stitchfix, Netflix, Microsoft, and other big companies for recommendations. There are tons of research going on the Multi-Arm Bandits and their application to real-time problems. This article is an attempt to apply Multi-Arm bandits.

What is a Multi-Arm Bandit?