Which machine learning algorithm did Walmart famously adopt in 2017 to optimize their mathematical pricing models, resulting in a reported 11% increase in conversion rates for their online platform?

In today's data-driven retail environment, machine learning algorithms have revolutionized how mathematics is applied to understand customer behavior and optimize sales. But how well do you know the specific machine learning techniques that major retailers employ? This trivia question explores how retailers leverage mathematical models to gain competitive advantages in the marketplace.

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XGBoost (Extreme Gradient Boosting)
K-Means Clustering
Naïve Bayes Classifier
LSTM (Long Short-Term Memory) Networks