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Ruby Cookbook question

Bharat Ruparel

1/6/2007 6:02:00 PM

Hello All,
This is a question from Ruby Cookbook by Lucas Carlson & Leonard
Richardson, Oreilly Publication. Recipe number 1.20 in Chapter 1 on
page 37.
As instructed in the book, I am trying to use the classifer gem to do
Bayesian Analysis. It advises me to install the classifer gem by using
the 'gem install classifer' command. gem asks me if I want to install
the stemmer gem as a dependency, I say yes and it installs it.

Next, I am trying to check if everything works by running a snippet out
of the README file from the classifer gem install directory as follows:

test.rb which contains the following lines of code:

require 'classifier'
b = Classifier::Bayes.new 'Interesting', 'Uninteresting'
b.train_interesting "here are some good words. I hope you love them"
b.train_uninteresting "here are some bad words, I hate you"
b.classify "I hate bad words and you" # returns 'Uninteresting'

When I run it, I get the following error:

>ruby test.rb
Notice: for 10x faster LSI support, please install
http://rb-gsl.ruby...
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`method_missing': undefined method `stem' for "here":String
(NoMethodError)
from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:32:in
`each'
from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:32:in
`word_hash_for_words'
from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:20:in
`word_hash'
from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:26:in
`train'
from (eval):1:in `method_missing'
from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`eval'
from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`method_missing'
from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`each'
from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`method_missing'
from test.rb:3
>Exit code: 1

I contacted the author, Lucas Carlson, concerning this and he advised me
to install the stemmer gem by doing 'gem install stemmer' command. I
have done that already by answering Yes to the question by gem installer
if the dependency gem should be installed? I can also see the stemmer
gem that has been installed in the gems directory. Mind you, this
happens both in Linux and Windows operating systems, therefore, there is
something that I must be overlooking. I haven't heard back from the
author. Therefore, I am posting this question here on the forum to see
if anyone can help.

Thanks in advance.

Bharat

--
Posted via http://www.ruby-....
2 Answers

Jano Svitok

1/7/2007 6:04:00 PM

0

On 1/6/07, Bharat Ruparel <bruparel@mercury.com> wrote:
> Hello All,
> This is a question from Ruby Cookbook by Lucas Carlson & Leonard
> Richardson, Oreilly Publication. Recipe number 1.20 in Chapter 1 on
> page 37.
> As instructed in the book, I am trying to use the classifer gem to do
> Bayesian Analysis. It advises me to install the classifer gem by using
> the 'gem install classifer' command. gem asks me if I want to install
> the stemmer gem as a dependency, I say yes and it installs it.
>
> Next, I am trying to check if everything works by running a snippet out
> of the README file from the classifer gem install directory as follows:
>
> test.rb which contains the following lines of code:
>
> require 'classifier'
> b = Classifier::Bayes.new 'Interesting', 'Uninteresting'
> b.train_interesting "here are some good words. I hope you love them"
> b.train_uninteresting "here are some bad words, I hate you"
> b.classify "I hate bad words and you" # returns 'Uninteresting'
>
> When I run it, I get the following error:
>
> >ruby test.rb
> Notice: for 10x faster LSI support, please install
> http://rb-gsl.ruby...
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
> `method_missing': undefined method `stem' for "here":String
> (NoMethodError)
> from
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:32:in
> `each'
> from
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:32:in
> `word_hash_for_words'
> from
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:20:in
> `word_hash'
> from
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:26:in
> `train'
> from (eval):1:in `method_missing'
> from
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
> `eval'
> from
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
> `method_missing'
> from
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
> `each'
> from
> c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
> `method_missing'
> from test.rb:3
> >Exit code: 1
>
> I contacted the author, Lucas Carlson, concerning this and he advised me
> to install the stemmer gem by doing 'gem install stemmer' command. I
> have done that already by answering Yes to the question by gem installer
> if the dependency gem should be installed? I can also see the stemmer
> gem that has been installed in the gems directory. Mind you, this
> happens both in Linux and Windows operating systems, therefore, there is
> something that I must be overlooking. I haven't heard back from the
> author. Therefore, I am posting this question here on the forum to see
> if anyone can help.

1. You can check you have the stemmer installed ok by running the
following script, outside of the gems dir:

require 'rubygems'
require 'stemmer'
puts 'here'.stem #=> 'here'

if it raises an exception (method missing or similar), the stemmer is
not installed correctly.

2. make sure that rubygems are required in the test script (either
directly or by -rubygems paramter to ruby or by using RUBYOPT
environment variable AND that stemmer is required somewhere (you can
fix it temporarily by running ruby -rubygems -rstemmer test.rb - if
that works, there's missing require line somewhere).

Bharat Ruparel

1/7/2007 10:57:00 PM

0

Thank you.
As you suggested, I checked if stemmer was installed correctly. It was.
Then I added the line
require 'stemmer' to my code and it worked.
Regards,
Bharat

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