Improved error message

phiml/math/_tensors.py

@@ -2232,7 +2232,7 @@ def reshaped_native(value: Tensor,
     Returns:
         Native tensor with dimensions matching `groups`.
     """
-    assert isinstance(value, Tensor), f"value must be a Tensor but got {type(value)}"
+    assert isinstance(value, Tensor), f"value must be a Tensor but got {value} {type(value)}"
     assert not value._is_tracer, f"Failed accessing native values because tensor {value.shape} is a tracer"
     assert value.shape.is_uniform, f"Only uniform (homogenous) tensors can be converted to native but got shape {value.shape}"
     assert isinstance(groups, (tuple, list)), f"groups must be a tuple or list but got {type(value)}"