[oncall]fix unittest dper/layer_models/tests:utils_test

as titled -- fix offending diff D7091725 due to added debug_info in operator
proto

caffe2/python/layer_model_helper.py

@@ -171,6 +171,18 @@ def maybe_add_global_constant(self, name, *args, **kwargs):
         # To ad hoc add new global constants without duplication
         # if the name was already registered in global_constants, it will not be
         # added even if the intended value is different from its original value
+
+        def op_equal(operator1, operator2):
+            o1 = copy.deepcopy(operator1)
+            o2 = copy.deepcopy(operator2)
+            # debug_info is supposed to be different, and we don't need to
+            # compare debug_info
+            if hasattr(o1, 'debug_info'):
+                o1.debug_info = ''
+            if hasattr(o2, 'debug_info'):
+                o2.debug_info = ''
+            return o1 == o2
+
         if name in self.global_constants:
             blob_name = self.global_constants[name]
             initializer_op = \
@@ -179,8 +191,8 @@ def maybe_add_global_constant(self, name, *args, **kwargs):
                 )
             # check if the original initializer is the same as the one intended
             # now
-            assert initializer_op == \
-                self.global_constant_initializers[blob_name], \
+            assert op_equal(initializer_op,
+                            self.global_constant_initializers[blob_name]), \
                 "conflict initializers for global constant %s, " \
                 "previous %s, now %s" % (
                     blob_name, str(initializer_op),