挂经

第一轮：
1. Bayes
2. normal distribution
3. confusion matrix: precision, recall, example
4. logistic regression formula, how to transform to [0,1], and when is 0, when is 1
5. how to split in the decision tree (chi-square)
6. which is the mode algorithm you admire most
第二轮：
1. code review: it is to merge user_table and transaction

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ou will do when the code doesn't work? You want to GET something, with like UserId, but nothing was printed out. The code worked in the morning but failed in the afternoon.