def register(self, klass, callback, name='default'):
        if klass not in self._definitions:
            self._definitions[klass] = {}

        self._definitions[klass][name] = callback
Generates a multivariate autoregressive dataset given the formula:
dataset/ETHPy150Open sdispater/orator/orator/orm/factory.py/Factory.register--crossover with--dataset/ETHPy150Open nipy/nitime/nitime/utils.py/generate_mar