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Scenario: Big Belly Foods, Inc. (BBF) operates 300 convenience stores across Latin America, selling a variety of packaged goods, drinks, and prepared foods like sandwiches and pizzas. The company's IT team is utilizing Azure MLflow to train a regression model in a notebook environment. The model aims to predict the number of customers visiting each store daily. Question: As a member of the team, you need to track the model's performance at the end of each training epoch. Which metric should be used to evaluate the model's performance during training?