使用sklearn进行特征离散化处理（LabelEncoder）
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import pandas as pd
import numpy as np
vg_df = pd.read_csv('vgsales.csv', encoding = 'ISO-8859-1')
vg_df[['Name', 'Platform', 'Year', 'Genre', 'Publisher']].iloc[1:7]
genres = np.unique(vg_df['Genre'])
genres
array([‘Action’, ‘Adventure’, ‘Fighting’, ‘Misc’, ‘Platform’, ‘Puzzle’,
‘Racing’, ‘Role-Playing’, ‘Shooter’, ‘Simulation’, ‘Sports’,
‘Strategy’], dtype=object)
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