DataConversionWarning: A column-vector y was passed when a 1d array was expected. 问题解决 和 数据平衡问题

在用SMOTE算法模块进行过采样（oversampling）时，pandas导入训练集合特征和label。


from imblearn.over_sampling import SMOTE # 导入SMOTE算法模块
# 处理不平衡数据
sm = SMOTE(random_state=122)    # 处理过采样的方法
X, y = sm.fit_sample(X, y)

/Users/wangchuang/anaconda3/lib/python3.6/site-packages/sklearn/utils/validation.py:547: DataConversionWarning: A column-vector y was passed when a 1d array was expected. Please change the shape of y to (n_samples, ), for example using ravel().
  y = column_or_1d(y, warn=True)

通过查询，解决方法如下，
from imblearn.over_sampling import SMOTE # 导入SMOTE算法模块
# 处理不平衡数据
sm = SMOTE(random_state=42)    # 处理过采样的方法
X, y = sm.fit_sample(X, y.values.ravel())