add cordillera default mask

rock-glacier-dataset.py

@@ -56,6 +56,7 @@ _URLS = {
         "test": "https://huggingface.co/datasets/alkzar90/rock-glacier-dataset/resolve/main/data/data_v01/test.zip",
 }
 
+_CORDILLERA_DEFAULT_MASK = "https://huggingface.co/datasets/alkzar90/rock-glacier-dataset/resolve/main/data/data_v01/zeros.png"
 
 _NAMES = ["cordillera", "glaciar"]
 
@@ -161,4 +162,10 @@ class RockGlacierDataset(datasets.GeneratorBasedBuilder):
                   "masks": path.replace(dir_name, "masks"),
                   "path": "/".join(path.split("/")[-3:]),
                   }
+            elif dir_name == "cordillera" and file_name.endswith(".png"):
+               yield i, {
+                  "image": path,
+                  "masks": _CORDILLERA_DEFAULT_MASK,
+                  "path": "/".join(path.split("/")[-3:]),
+                  }