def drag_and_drop(self, source, target):
        self.click_and_hold(source)
        self.release(target)
        return self
Check validity of parameters and raise ValueError if not valid.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/selenium/webdriver/common/action_chains.py/ActionChains.drag_and_drop--crossover with--dataset/ETHPy150Open scikit-learn/scikit-learn/sklearn/ensemble/gradient_boosting.py/BaseGradientBoosting._check_params