Fix bug in download script

EgoSpeak.py

@@ -31,14 +31,24 @@ class EgoSpeak(GeneratorBasedBuilder):
         )
 
     def _split_generators(self, dl_manager):
-        # Path to the dataset directory (change if different)
-        data_dir = os.path.abspath(dl_manager.manual_dir)
-        return [
-            SplitGenerator(
-                name=Split.TRAIN,
-                gen_kwargs={"data_dir": data_dir},
-            ),
-        ]
+      # Use the Hugging Face cache directory as the default
+      data_dir = os.path.abspath(dl_manager.manual_dir or dl_manager.cache_dir)
+      
+      # If no data is available in the cache or provided manually, raise an error
+      if not os.listdir(data_dir):
+          raise ValueError(
+              "Dataset requires data to be present in the Hugging Face cache or manually specified. "
+              "Please provide the `data_dir` parameter or ensure the dataset is cached correctly. "
+              "For example: `load_dataset('kjunh/EgoSpeak', data_dir='/path/to/dataset')`."
+          )
+      
+      return [
+          SplitGenerator(
+              name=Split.TRAIN,
+              gen_kwargs={"data_dir": data_dir},
+          ),
+      ]
+
 
     def _generate_examples(self, data_dir):
         """Generate examples from the dataset directory structure."""