On Fri, Apr 22, 2011 at 6:39 AM, Stanley Xu <wenhao...@gmail.com> wrote:
> One more question, I am also trying to test the MixedGradient, it looks > like the RankingGradient will take much more time than the DefaultGradient. > This is probably due to memory use. You need to review which way you group users. > > If I set the alpha to 0.5, it will take 50 times of time comparing to the > DefaultGradient, I thought it should be like that for the RankingGradient > will do lots of Ranking comparison, and I heard that the algorithm is not > sensitive to alpha, how would you suggest a alpha I should choose? I haven't > found much material or suggestion about that. > The time should not change with alpha. I have found that between .1 and .9, the results don't change a huge amount.
