Better test error infomation

theano/tensor/tests/test_gc.py

@@ -90,9 +90,16 @@ def test_gc_never_pickles_temporaries():
         # assert that f() didn't cause the function to grow
         # allow_gc should leave the function un-changed by calling
         if len_pre_f != len_post_f:
-            print(pre_f)
-            print(post_f)
-        assert len_pre_f == len_post_f
+            for i in range(len_pre_f//100):
+                p1 = pre_f[i*100:(i+1)*100]
+                p2 = post_f[i*100:(i+1)*100]
+                if p1 != p2:
+                    print(i)
+                    print("p1")
+                    print(p1)
+                    print("p2")
+                    print(p2)
+        assert len_pre_f == len_post_f, (len_pre_f, len_post_f)
 
         # assert that g() didn't cause g to grow because temporaries
         # that weren't collected shouldn't be pickled anyway