Brill Tagger Demo Broken

I noticed that in the book (section 6, example 6.1), the suggested code is: nltk.tag.brill.demo()

When I run this I get the following error: AttributeError: module 'nltk.tag.brill' has no attribute 'demo'

Am I missing something?

[antmarakis]

What @campionfellin did worked. Thanks!

Maybe the book should instead of nltk.tag.brill.demo() be:

from nltk.tbl import demo as brill_tagger
brill_tagger.demo()

[campionfellin]

Hey, I am not getting this error, using python v2.7.10. What version are you using? This is my output:

>>> import nltk
>>> from nltk.tbl import demo as issue1828
>>> issue1828.demo()
Loading tagged data from treebank...
Read testing data (200 sents/5251 wds)
Read training data (800 sents/19933 wds)
Read baseline data (800 sents/19933 wds) [reused the training set]
Trained baseline tagger
    Accuracy on test set: 0.8345
Training tbl tagger...
TBL train (fast) (seqs: 800; tokens: 19933; tpls: 24; min score: 3; min acc: None)
Finding initial useful rules...
    Found 12960 useful rules.

           B      |
   S   F   r   O  |        Score = Fixed - Broken
   c   i   o   t  |  R     Fixed = num tags changed incorrect -> correct
   o   x   k   h  |  u     Broken = num tags changed correct -> incorrect
   r   e   e   e  |  l     Other = num tags changed incorrect -> incorrect
   e   d   n   r  |  e
------------------+-------------------------------------------------------
  23  23   0   0  | POS->VBZ if Pos:PRP@[-2,-1]
  16  17   1   0  | NN->VB if Pos:-NONE-@[-2] & Pos:TO@[-1]
  15  16   1   0  | VBN->VBD if Pos:PRP@[-1]
  12  12   0   0  | VBP->VB if Pos:MD@[-2,-1]

and so on…