在大熊猫数据识别中，快速地按组删除异常值

I have a relatively large DataFrame object (about a million rows, hundreds of columns), and I'd like to clip outliers in each column by group. By "clip outliers for each column by group" I mean - compute the 5% and 95% quantiles for each column in a group and clip values outside this quantile range. I have a relatively large DataFrame object (abo