The latest release of Autoray is unfortunately incompatible with PennyLane v0.29. This is causing the following error:
AttributeError: 'float' object has no attribute 'ndim'
We have made a bugfix release of PennyLane 
. You should use PennyLane v0.29.1 to avoid having this error. You can upgrade to the latest release by running:
python -m pip install -U pennylane