Checks

checks.check_left_canonization(states)

Check if states is in left-canonical form.

Parameters

states (list of N ndarrays) -- The N leftmost tensors in the MPS-OBC representation of a state of an n-body. states [0] should be an order-2 tensor, and all the others should be order-3 tensors, such that states [i].shape[-1] == states [i+1].shape[0] (i.e. they can be contracted "in line").

Returns

flag -- True if states are in a left-canonical form, False otherwise.

Return type

Boolean

checks.check_right_canonization(states)

Check if states are in right-canonical form.

Parameters

states (list of N ndarrays) -- The N rightmost tensors in the MPS-OBC representation of a state of an n-body. states [-1] should be an order-2 tensor, and all the others should be order-3 tensors, such that states [i].shape[-1] == states [i+1].shape[0] (i.e. they can be contracted "in line").

Returns

flag -- True if states are in a right-canonical form, False otherwise.

Return type

Boolean