diff --git a/spacy/pipeline/coref.py b/spacy/pipeline/coref.py
index f0ae62fa9..2f9baaeb4 100644
--- a/spacy/pipeline/coref.py
+++ b/spacy/pipeline/coref.py
@@ -333,7 +333,7 @@ class CoreferenceResolver(TrainablePipe):
 
         X = []
         Y = []
-        for ex in islice(get_examples(), 10):
+        for ex in islice(get_examples(), 2):
             X.append(ex.predicted)
             Y.append(ex.reference)