Relax requirement on the outputs of the predictor.

Summary: It looks like it's a bit too restrictive requirement. Let's remove it.

Reviewed By: volkhin

Differential Revision: D5150968

fbshipit-source-id: 9e38574edc6542c5ce3c7f25a01afe8f5ff9b507
diff --git a/caffe2/python/predictor/predictor_exporter.py b/caffe2/python/predictor/predictor_exporter.py
index 2c89e38..8b1f99f 100644
--- a/caffe2/python/predictor/predictor_exporter.py
+++ b/caffe2/python/predictor/predictor_exporter.py
@@ -46,8 +46,6 @@
         outputs = [str(o) for o in outputs]
         assert len(set(inputs)) == len(inputs), (
             "All inputs to the predictor should be unique")
-        assert len(set(outputs)) == len(outputs), (
-            "All outputs of the predictor should be unique")
         parameters = [str(p) for p in parameters]
         shapes = shapes or {}