parameters.py 文件源码

def __iter__(self):
        """Iterate over the points in the grid.
        Returns
        -------
        params : iterator over dict of string to any
            Yields dictionaries mapping each estimator parameter to one of its
            allowed values.
        """
        for p in self.param_grid:
            # Always sort the keys of a dictionary, for reproducibility
            items = list(p.items())
            if not items:
                yield {}
            else:
                for estimator, grid_list in items:
                    for grid in grid_list:
                        grid_points = sorted(list(grid.items()))
                        keys, values = zip(*grid_points)
                        for v in product(*values):
                            params = dict(zip(keys, v))
                            yield (estimator, params)