Update dataset.py

dataset.py

@@ -67,11 +67,14 @@ class MyDataset(GeneratorBasedBuilder):
 
     def _generate_examples(self, filepath):
         if filepath.endswith(".arrow"):
-            table = pa.ipc.RecordBatchFileReader(filepath).read_all()
+            try:
+                with open(filepath, "rb") as f:
+                    table = pa.ipc.RecordBatchFileReader(f).read_all()
+            except pa.lib.ArrowInvalid:
+                raise ValueError(f"File {filepath} is not a valid Arrow file.")
             data = table.to_pydict()
-            keys = list(data.keys())
-            for i in range(len(data[keys[0]])):
-                yield i, {k: data[k][i] for k in keys}
+            for i in range(len(next(iter(data.values())))):
+                yield i, {k: data[k][i] for k in data}
         elif filepath.endswith(".csv"):
             with open(filepath, encoding="utf-8") as f:
                 reader = csv.DictReader(f)