Maps transformation functions onto the nodes of an OP_TREE.

root The operation or tree of operations to transform.
op_transformation How to transform the operations (i.e. leaves).
iter_transformation How to transform the iterables (i.e. internal nodes).
preserve_moments Whether to leave Moments alone. If True, the transformation functions will not be applied to Moments or the operations within them.

A transformed operation tree.

TypeError root isn't a valid OP_TREE.