timonecomcastnet tim peters httpsfnetprojectshowfilesphpgroup_id61702 binary pickle classifier training first spamham corpora pair records spamprob unknown_spamprob purged zip file half meg jeremy would interesting tried data false negative rates across 4 test sets run 0364 0400 0400 0909 fri 06 sep 2002 192115 0400 spambayes ann trained classifier available