Use native reader for evaluation

Summary:
Since hashing is different.

This should be ready to commit now. Running ads nn canaries.

Differential Revision: D4264009

fbshipit-source-id: 3aa16b0c47c61f9a442b0375524c5f1580af5892
diff --git a/caffe2/python/control.py b/caffe2/python/control.py
index de629d2..6c220e2 100644
--- a/caffe2/python/control.py
+++ b/caffe2/python/control.py
@@ -197,6 +197,9 @@
             last_cond = curr_cond
         else:
             last_cond = merged_net.__getattr__(relation)([last_cond, curr_cond])
+        # merge attributes
+        for k, v in condition_nets[i]._attr_dict.items():
+            merged_net._attr_dict[k] += v
 
     merged_net.AddExternalOutput(last_cond)