Add the _generate_examples method

NIH-Chest-X-ray-dataset.py

@@ -135,7 +135,12 @@ class XChest(datasets.GeneratorBasedBuilder):
 		]
 
 	def _generate_examples(self, files):
-		pass
-
-
+		for i, path in enumerate(files):
+		    file_name = os.path.basename(path)
+		    if file_namae.endswith(".png"):
+		        yield i, {
+			    "image_file_path": path,
+			    "image": path,
+			    "labels": "a",
+			}