Address review

Matt Roeschke · Matt Roeschke · commit 60f5be571b68 · 2018-10-01T15:39:13.000-07:00
diff --git a/sklearn/covariance/robust_covariance.py b/sklearn/covariance/robust_covariance.py
@@ -432,6 +432,7 @@ def fast_mcd(X, support_fraction=None,
         except MemoryError:
             # The above is too big. Let's try with something much small
             # (and less optimal)
+            n_best_tot = 10
             all_best_covariances = np.zeros((n_best_tot, n_features,
                                              n_features))
             n_best_sub = 2
diff --git a/sklearn/covariance/shrunk_covariance_.py b/sklearn/covariance/shrunk_covariance_.py
@@ -311,7 +311,7 @@ def ledoit_wolf(X, assume_centered=False, block_size=1000):
                       "You may want to reshape your data array")
         n_features = X.size
     else:
-        n_samples, n_features = X.shape
+        _, n_features = X.shape
 
     # get Ledoit-Wolf shrinkage
     shrinkage = ledoit_wolf_shrinkage(
