matching conll2003 loading script

pico-breast-cancer.py

@@ -110,3 +110,12 @@ class PicoBreastCancer(datasets.GeneratorBasedBuilder):
                     splits = line.split(" ")
                     tokens.append(splits[0])
                     ner_tags.append(splits[1].rstrip())
+            # last example
+            if tokens:
+                yield guid, {
+                    "id": str(guid),
+                    "tokens": tokens,
+                    "pos_tags": pos_tags,
+                    "chunk_tags": chunk_tags,
+                    "ner_tags": ner_tags,
+                }