support web link for 'Global.pretrained_model' when export models

ppcls/engine/engine.py

@@ -548,7 +548,10 @@ class Engine(object):
             "use_multilabel",
             False) or "ATTRMetric" in self.config["Metric"]["Eval"][0]
         model = ExportModel(self.config["Arch"], self.model, use_multilabel)
-        if self.config["Global"]["pretrained_model"] is not None:
+        if self.config["Global"]["pretrained_model"].startswith("http"):
+            load_dygraph_pretrain_from_url(
+                model.base_model, self.config["Global"]["pretrained_model"])
+        else:
             load_dygraph_pretrain(model.base_model,
                                   self.config["Global"]["pretrained_model"])