Java programming parses by matching and merging data instances (data preprocessing)

This paper mainly studies the relevant contents of Java programming through matching and merging data (data preprocessing), as follows.

data description

The following procedure is to merge the data in the following format.

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Each row of this table represents the user ID and user characteristics. Among them, a user has only one eigenvector, that is, the first column will not be repeated.

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The first column of this table represents the user's ID, the second column represents the movie seen by the user, the third column represents the user's score on the movie (1-13 points), and the fourth column represents the user's score on the movie, but the score range is 1-5 points.

Problem description

How to add user characteristics to the second table during data preprocessing? In fact, the method is very simple. Just match the user ID of the second table with the user ID of the first table. The consolidated results are shown in the figure below.

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Data processing program

summary

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