Function check_random_state

mne/utils/check.py:207–225

Turn seed into a numpy.random.mtrand.RandomState instance. If seed is None, return the RandomState singleton used by np.random.mtrand. If seed is an int, return a new RandomState instance seeded with seed. If seed is already a RandomState instance, return it. Otherwise raise ValueEr

(seed)

# adapted from scikit-learn utils/validation.py
def check_random_state(seed):
    """Turn seed into a numpy.random.mtrand.RandomState instance.

    If seed is None, return the RandomState singleton used by np.random.mtrand.
    If seed is an int, return a new RandomState instance seeded with seed.
    If seed is already a RandomState instance, return it.
    Otherwise raise ValueError.
    """
    if seed is None or seed is np.random:
        return np.random.mtrand._rand
    if isinstance(seed, int | np.integer):
        return np.random.mtrand.RandomState(seed)
    if isinstance(seed, np.random.mtrand.RandomState):
        return seed
    if isinstance(seed, np.random.Generator):
        return seed
    raise ValueError(
        f"{seed!r} cannot be used to seed a numpy.random.mtrand.RandomState instance"
    )


def _check_event_id(event_id, events):