semi-supervised
Merge branch 'master' of https://github.com/Linda-sunshine/IR_Base
modified N grams
modified N gram 2
chi test
1214
Merge branch 'master' of https://github.com/Linda-sunshine/IR_Base
fix outofbound
bug on CHI
conflict resolved
fix feature selector
Merge branch 'master' of https://github.com/Linda-sunshine/IR_Base
fix selector
Delete fv.dat

It is too large to cause error in push.
Merge branch 'master' of https://github.com/Linda-sunshine/IR_Base
fix selector