Improve warning message in ElasticNet (scikit-learn#8565)

Sentient07 · Jeremiah Johnson · commit 58dc3e672621 · 2017-12-18T15:17:03.000-05:00
diff --git a/sklearn/linear_model/cd_fast.pyx b/sklearn/linear_model/cd_fast.pyx
@@ -217,8 +217,8 @@ def enet_coordinate_descent(np.ndarray[floating, ndim=1] w,
     cdef floating *R_data = <floating*> R.data
     cdef floating *XtA_data = <floating*> XtA.data
 
-    if alpha == 0:
-        warnings.warn("Coordinate descent with alpha=0 may lead to unexpected"
+    if alpha == 0 and beta == 0:
+        warnings.warn("Coordinate descent with no regularization may lead to unexpected"
             " results and is discouraged.")
 
     with nogil:
