def _sample_mvn(n_samples, cov, prng):
    """Draw a multivariate normal sample from the graph defined by cov.

    Parameters
    -----------
    n_samples : int

    cov : matrix of shape (n_features, n_features)
        Covariance matrix of the graph.

    prng : np.random.RandomState instance.
    """
    n_features, _ = cov.shape
    return prng.multivariate_normal(np.zeros(n_features), cov, size=n_samples)
Draw a multivariate normal sample from the graph defined by cov.

    Parameters
    -----------
    n_samples : int

    cov : matrix of shape (n_features, n_features)
        Covariance matrix of the graph.

    prng : np.random.RandomState instance.