add infer code

recommend-model-produce/src/main/python/models/dssm/static_model.py

@@ -59,7 +59,7 @@ class StaticModel():
             left_vec = dssm_model(left_features,None,is_infer=True)
             self.inference_target_var = left_vec
             fetch_dict = {
-                'sample_id': sample_id
+                'sample_id': sample_id,
                 'left_vector': left_vec
             }
             return fetch_dict