[Retracted] Design and Implementation of a Machine Learning-Based English Intelligent Test System

Table 2

Statistical information on the dataset.

Dataset	Users	Items	Interactions	Density
Gowalla	27458	40685	1027424	0.000074
Amazon-book	54231	95478	2948712	0.00059

(1) Gowalla dataset: this dataset is a check-in dataset from the Gowalla website, which records the check-in time and location information of users on the social networking site, including user ID, check-in time, latitude, longitude, and location ID. Users can share their location through check-in.