minor fix

Author: TobyRoseman

coremltools/converters/mil/frontend/torch/test/test_torch_ops.py

@@ -4769,4 +4769,4 @@ def test_copy(self, backend, rank):
         input_shape = tuple(np.random.randint(low=2, high=6, size=rank))
 
         model = ModuleWrapper(function=lambda x: x.copy_())
-        run_compare_torch(input_shape, model, backend=backend)
+        self.run_compare_torch(input_shape, model, backend=backend)