Modified an error message

Author: nabenabe0928

.gitignore

@@ -138,3 +138,7 @@ dask-worker-space/
 # Test output
 tmp/
 .tmp_evaluation
+
+# private
+grep.py
+memo.txt

autoPyTorch/datasets/base_dataset.py

@@ -27,7 +27,7 @@
 
 
 def check_valid_data(data: Any) -> None:
-    if not any(hasattr(data, attr) for attr in ['__getitem__', '__len__']):
+    if not all(hasattr(data, attr) for attr in ['__getitem__', '__len__']):
         raise ValueError(
             'The specified Data for Dataset must have both __getitem__ and __len__ attribute.')