'Transform unconstrained parameters used by the optimizer to constrained
parameters used in likelihood evaluation
Parameters
unconstrained : array_like
Array of unconstrained parameters used by the optimizer, to be
transformed.
Returns
constrained : array_like
Array of constrained parameters which may be used in likelihood
evalation.
Notes
This is a noop in the base class, subclasses should override where
appropriate.'

def transform_params(self, unconstrained):

    return np.array(unconstrained, ndmin=1)
