Fix streaming

We extend `open` to work in streaming mode, but we don't extend `jsonlines.open`

pmc_oa.py

@@ -108,8 +108,9 @@ class PMC_OA(datasets.GeneratorBasedBuilder):
     def _generate_examples(self, filepath, image_dir):
         """Yields examples."""
         logger.info("generating examples from = %s", filepath)
-         
-        with jsonlines.open(filepath) as reader:
+        
+        with open(filepath, encoding="utf-8") as f:
+            reader = jsonlines.open(f)
             for _id, obj in enumerate(reader):
                 if self.config.name == "pmc_oa_beta":
                     relative_image_path = obj['image']