def __init__(self, genomic_signal_objs, db, **kwargs):
        super(GeneModelMiniBrowser, self).__init__(
            genomic_signal_objs, **kwargs)
        self.db = db
Estimate sigma. If ML is True, return the ML estimate of sigma,
dataset/ETHPy150Open daler/metaseq/metaseq/minibrowser.py/GeneModelMiniBrowser.__init__--crossover with--dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/sandbox/panel/mixed.py/OneWayMixed._compute_sigma