def __init__(self, assets_dir=None, requirements_file="requirements.yml"):
        self.assets_dir = assets_dir or Path(".") / "assets"
        self.requirements = GroupedRequirements()
        self.requirements.load(requirements_file)
        self.temp_dir = mkdtemp()
def idq_lq(id, iq, lq, ax=0):
    """creates a surface plot of lq vs. id, iq"""
    if ax == 0:
        _create_3d_axis()
        ax = plt.gca()
    _plot_surface(ax, id, iq, np.asarray(lq)*1e3,
                  (u'Id/A', u'Iq/A', u'L q/mH'),
                  azim=120)