Text of the ValueError in _check_param_grid has been changed.

Old value: Parameter ({0}) value should be a list.
New value: Parameter values for parameter ({}) need to be a sequence.

Author: b0noI

sklearn/grid_search.py

@@ -332,12 +332,12 @@ def _check_param_grid(param_grid):
 
             check = [isinstance(v, k) for k in (list, tuple, np.ndarray)]
             if True not in check:
-                raise ValueError("Parameter ({0}) value should be a list."
-                                 "".format(name))
+                raise ValueError("Parameter values for parameter ({}) need to "
+                                 "be a sequence.".format(name))
 
             if len(v) == 0:
-                raise ValueError("Parameter ({0}) value should be a non-empty "
-                                 "list.".format(name))
+                raise ValueError("Parameter values for parameter ({}) need to "
+                                 "be a non-empty sequence.".format(name))
 
 
 class _CVScoreTuple (namedtuple('_CVScoreTuple',

sklearn/model_selection/_search.py

@@ -333,12 +333,12 @@ def _check_param_grid(param_grid):
 
             check = [isinstance(v, k) for k in (list, tuple, np.ndarray)]
             if True not in check:
-                raise ValueError("Parameter({0}) values should be a list."
-                                 "".format(name))
+                raise ValueError("Parameter values for parameter ({}) need to "
+                                 "be a sequence.".format(name))
 
             if len(v) == 0:
-                raise ValueError("Parameter({0}) values should be a non-empty "
-                                 "list.".format(name))
+                raise ValueError("Parameter values for parameter ({}) need to "
+                                 "be a non-empty sequence.".format(name))
 
 
 # XXX Remove in 0.20