add path feature in the dataset

rock-glacier-dataset.py

@@ -83,6 +83,7 @@ class RockGlacierDataset(datasets.GeneratorBasedBuilder):
          features = datasets.Features({
             "image": datasets.Image(),
             "labels": datasets.features.ClassLabel(names=_NAMES),
+            "path": datasets.features.Value("string"),
             })
          keys = ("image", "labels")
          
@@ -153,6 +154,7 @@ class RockGlacierDataset(datasets.GeneratorBasedBuilder):
                yield i, {
                   "image": path,
                   "labels": os.path.basename(os.path.dirname(path)).lower(),
+                  "path": path,
                   }
       
       if self.config.name == "image-segmentation":