例如：获取R机器学习常用包的mlbench内置的数据集和文本描述
输入
library(mlbench) print(data(package="mlbench")) #实际操作mlbench改为所需package名
输出
Data sets in package ‘mlbench’: BostonHousing Boston Housing Data BostonHousing2 Boston Housing Data BreastCancer Wisconsin Breast Cancer Database DNA Primate splice-junction gene sequences (DNA) Glass Glass Identification Database HouseVotes84 United States Congressional Voting Records 1984 Ionosphere Johns Hopkins University Ionosphere database LetterRecognition Letter Image Recognition Data Ozone Los Angeles ozone pollution data, 1976 PimaIndiansDiabetes Pima Indians Diabetes Database PimaIndiansDiabetes2 Pima Indians Diabetes Database Satellite Landsat Multi-Spectral Scanner Image Data Servo Servo Data Shuttle Shuttle Dataset (Statlog version) Sonar Sonar, Mines vs. Rocks Soybean Soybean Database Vehicle Vehicle Silhouettes Vowel Vowel Recognition (Deterding data) Zoo Zoo Data
