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python imbalanced data machine learning classification
msk = df_train['Class'] == 1
num_to_oversample = len(df_train) - 2*msk.sum()
df_positive_oversample = df_train[msk].sample(n=num_to_oversample, replace=True, random_state=888)
df_train_oversample = pd.concat([df_train, df_positive_oversample])
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