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If recommendations cannot be made due to incomplete data or incomplete results, secondary MDT can be organized at an optional time, but such situations should be avoided as much as possible.……(未完待续。Birthday banknotes refer to the numbers naturally generated in the currency in circulation officially issued by the People's Bank of China. For example, your birthday is October 15, 1978, so the full set of fifth edition RMB birthday banknotes are all 19781015 after the crown numbers of 100 yuan, 50 yuan, 10 yuan, 5 yuan, 2 yuan and 1 yuan. The eight-digit number of each RMB is the same as the date number of the birthday. Birthday banknotes are a symbol of the interweaving and radiance of fate and wealth. Birthdays are destined by heaven. It is also a gift to find the same number in the vast sea of money. It symbolizes that wealth will always accompany you, with sincerity and long blessings. The birth number is selected from many RMB banknotes with the same number. It is difficult to imagine. In addition, more and more people like it. In recent years, it has become more and more difficult to collect it. Therefore, it is your best choice to sell it early and benefit it early. It is your best choice to collect it directly, to collect it directly for your relatives and friends, and to give it to high-end customers. It is your best choice. Birthday gifts send "heart".In order to establish a reliable cross-validation method, you must have a good understanding of the data and the challenges you face. I will also check and ensure that the validation set has a similar distribution to the training set and the test set, and try my best to ensure that the final model improves in both local validation and ranking.Light tube shot in automatic modeIn real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.