Addition of an Array and a Tensor returns an object Array instead of a Tensor

[Andreas Dutzler]

np.eye(3) + tr.Tensor(np.eye(3))

This one is ok

tr.Tensor(np.eye(3)) + np.eye(3)

It's because the first line calls np.eye(3).__add__(tr.Tensor(np.eye(3))). This should raise an Error, so that tr.Tensor(np.eye(3)).__radd__(np.eye(3)) is called. "Unfortunately", an array iterates through its items and performs the addition.

This could help: https://stackoverflow.com/questions/45947152/custom-class-with-add-to-add-with-numpy-array