[python-package] remove unused imports (#5559)

python-package/lightgbm/dask.py

@@ -17,13 +17,13 @@ from urllib.parse import urlparse
 import numpy as np
 import scipy.sparse as ss
 
-from .basic import LightGBMError, _choose_param_value, _ConfigAliases, _log_info, _log_warning, _safe_call
+from .basic import LightGBMError, _choose_param_value, _ConfigAliases, _log_info, _log_warning
 from .compat import (DASK_INSTALLED, PANDAS_INSTALLED, SKLEARN_INSTALLED, Client, LGBMNotFittedError, concat,
                      dask_Array, dask_array_from_delayed, dask_bag_from_delayed, dask_DataFrame, dask_Series,
                      default_client, delayed, pd_DataFrame, pd_Series, wait)
-from .sklearn import (LGBMClassifier, LGBMModel, LGBMRanker, LGBMRegressor, _LGBM_ScikitCustomEvalFunction,
-                      _LGBM_ScikitCustomObjectiveFunction, _LGBM_ScikitEvalMetricType, _lgbmmodel_doc_custom_eval_note,
-                      _lgbmmodel_doc_fit, _lgbmmodel_doc_predict)
+from .sklearn import (LGBMClassifier, LGBMModel, LGBMRanker, LGBMRegressor, _LGBM_ScikitCustomObjectiveFunction,
+                      _LGBM_ScikitEvalMetricType, _lgbmmodel_doc_custom_eval_note, _lgbmmodel_doc_fit,
+                      _lgbmmodel_doc_predict)
 
 _DaskCollection = Union[dask_Array, dask_DataFrame, dask_Series]
 _DaskMatrixLike = Union[dask_Array, dask_DataFrame]

python-package/lightgbm/sklearn.py

@@ -3,7 +3,7 @@
 import copy
 from inspect import signature
 from pathlib import Path
-from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple, Union
+from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
 import numpy as np