API.

*   Tensors are no longer hashable, but instead compare element-wise with `==`
    and `!=`. Use `tf.compat.v1.disable_tensor_equality()` to return to the
    previous behavior.

*   Performing equality operations on Tensors or Variables with incompatible
    shapes an exception is no longer thrown. Instead `__eq__` returns False and
    `__ne__` returns True.