Changing name of model from export.pkl to model.pkl

Necessary fro creating a good downstream instruction

pipeline.py

@@ -11,7 +11,7 @@ class PreTrainedPipeline:
         # Preload all the elements you are going to need at inference.
         # For instance your model, processors, tokenizer that might be needed.
         # This function is only called once, so do all the heavy processing I/O here"""
-        self.model = load_learner(os.path.join(path, "export.pkl"))
+        self.model = load_learner(os.path.join(path, "model.pkl"))
         with open(os.path.join(path, "config.json")) as config:
             config = json.load(config)
         self.id2label = config["id2label"]