enforce at least one transform

torchvision/transforms/v2/_container.py

@@ -43,14 +43,12 @@ def __init__(self, transforms: Sequence[Callable]) -> None:
         super().__init__()
         if not isinstance(transforms, Sequence):
             raise TypeError("Argument transforms should be a sequence of callables")
+        elif not transforms:
+            raise ValueError("Pass at least one transform")
         self.transforms = transforms
 
     def forward(self, *inputs: Any) -> Any:
         needs_unpacking = len(inputs) > 1
-
-        if not self.transforms:
-            return inputs if needs_unpacking else inputs[0]
-
         for transform in self.transforms:
             outputs = transform(*inputs)
             inputs = outputs if needs_unpacking else (outputs,)