Japan has no official supermarket ranking, but stores fall into three tiers by positioning: Kinokuniya and Seijo Ishii for gifts and imported food; Life, AEON, and Seiyu for everyday groceries; OK, Gyomu Super, and Lopia for bulk and low prices. At checkout, food is taxed at 8% and alcohol at 10%.
Week 4 covers three forms of machine learning. Supervised learning fits a hypothesis function to labeled data: classify by the k nearest neighbors, or draw a decision boundary with a set of weights (perceptron learning rule, logistic regression, support vector machines), then use loss functions, regularization and cross-validation against overfitting. Reinforcement learning uses Q-learning to update the estimated value of each state and action from rewards, with ε-greedy keeping some probability of random exploration. Unsupervised learning clusters with k-means. With time links for every section, plus the approach and ways to check your work for the Shopping and Nim projects.