What does the -p and -mr option of BuildForest and TestForest mean

[XiaoboGu]

Hi,

If call BuildForest without the -p option, then what algorithm is used?

Regarding to the -mr option of TestForest, there are two senarioes:
1. If -i option is supplied with a HDFS file or path URL, will Mahout use 
Hadoop to do the classification even if without the -mr option?
2.If -I option is supplied with a local file path, then what does the -mr 
option will do, copy the file into the configed Hadoop cluster, or launch a 
local Hadoop instance?

Regards,

Xiaobo Gu