Update fit_params in doctest

Author: smurching

python/spark_sklearn/grid_search.py

@@ -125,7 +125,7 @@ class GridSearchCV(BaseSearchCV):
                          kernel='rbf', max_iter=-1, probability=False,
                          random_state=None, shrinking=True, tol=...,
                          verbose=False),
-           fit_params={}, iid=..., n_jobs=1,
+           fit_params=..., iid=..., n_jobs=1,
            param_grid=..., pre_dispatch=..., refit=...,
            scoring=..., verbose=...)
     >>> sorted(clf.cv_results_.keys())
@@ -243,10 +243,7 @@ def __init__(self, sc, estimator, param_grid, scoring=None, fit_params=None,
             refit=refit, cv=cv, verbose=verbose, pre_dispatch=pre_dispatch, error_score=error_score,
             return_train_score=return_train_score)
 
-        if fit_params is None:
-            self.fit_params = {}
-        else:
-            self.fit_params = fit_params
+        self.fit_params = fit_params if fit_params is not None else {}
 
         self.sc = sc
         self.param_grid = param_grid