style_learner(dls, model, get_feats, style_fns, loss_func=None, cbs=None, metrics=None, opt_func='Adam', lr=0.001, splitter='trainable_params', path=None, model_dir='models', wd=None, wd_bn_bias=False, train_bn=True, moms=(0.95, 0.85, 0.95))