我目前正在尝试使用逻辑回归进行二元分类。 我现在正在确定特征的重要性。 我已经完成了数据预处理(独热编码和抽样),并且使用XGBoost和RandomForestClassifier运行了它,没有问题。
然而,当我尝试拟合逻辑回归模型时(以下是我的Notebook中的代码),
from sklearn.linear_model import LogisticRegression
#Logistic Regression
# fit the model
model = LogisticRegression()
# fit the model
model.fit(np.array(X_over), np.array(y_over))
# get importance
importance = model.coef_[0]
# summarize feature importance
df_imp = pd.DataFrame({'feature':list(X_over.columns), 'importance':importance})
display(df_imp.sort_values('importance', ascending=False).head(20))
# plot feature importance
plt.bar(list(X_over.columns), importance)
plt.show()
出现了错误
...
~\AppData\Local\Continuum\anaconda3\lib\site-packages\joblib\parallel.py in <listcomp>(.0)
223 with parallel_backend(self._backend, n_jobs=self._n_jobs):
224 return [func(*args, **kwargs)
--> 225 for func, args, kwargs in self.items]
226
227 def __len__(self):
~\AppData\Local\Continuum\anaconda3\lib\site-packages\sklearn\linear_model\_logistic.py in _logistic_regression_path(X, y, pos_class, Cs, fit_intercept, max_iter, tol, verbose, solver, coef, class_weight, dual, penalty, intercept_scaling, multi_class, random_state, check_input, max_squared_sum, sample_weight, l1_ratio)
762 n_iter_i = _check_optimize_result(
763 solver, opt_res, max_iter,
--> 764 extra_warning_msg=_LOGISTIC_SOLVER_CONVERGENCE_MSG)
765 w0, loss = opt_res.x, opt_res.fun
766 elif solver == 'newton-cg':
~\AppData\Local\Continuum\anaconda3\lib\site-packages\sklearn\utils\optimize.py in _check_optimize_result(solver, result, max_iter, extra_warning_msg)
241 " https://scikit-learn.org/stable/modules/"
242 "preprocessing.html"
--> 243 ).format(solver, result.status, result.message.decode("latin1"))
244 if extra_warning_msg is not None:
245 warning_msg += "\n" + extra_warning_msg
AttributeError: 'str' object has no attribute 'decode'
我在谷歌上搜索了一下,大多数回答都说这个错误是因为scikit-learn库试图对已经解码的字符串进行解码。但是我不知道如何在我的情况下解决它。我确保所有数据都是整数或float64,没有字符串。