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This code is part of Qiskit.","#","# (C) Copyright IBM 2017, 2020.","#","# This code is licensed under the Apache License, Version 2.0. You may","# obtain a copy of this license in the LICENSE.txt file in the root directory","# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.","#","# Any modifications or derivative works of this code must retain this","# copyright notice, and modified files need to carry a notice indicating","# that they have been altered from the originals.","","\"\"\"","Methods to create random operators.","\"\"\"","","from __future__ import annotations","","import numpy as np","from numpy.random import default_rng","","from qiskit.exceptions import QiskitError","from qiskit.quantum_info.operators import Operator, Stinespring","","# pylint: disable=unused-import","from .dihedral.random import random_cnotdihedral","from .symplectic.random import random_clifford, random_pauli, random_pauli_list","","DEFAULT_RNG = default_rng()","","","def random_unitary(dims: int | tuple, seed: int | np.random.Generator | None = None):"," \"\"\"Return a random unitary Operator.",""," The operator is sampled from the unitary Haar measure.",""," Args:"," dims (int or tuple): the input dimensions of the Operator."," seed (int or np.random.Generator): Optional. 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