NLTK: why does nltk not recognize the CLASSPATH variable for stanford-ner?

Question

This is my code

from nltk.tag import StanfordNERTagger
st = StanfordNERTagger('english.all.3class.distsim.crf.ser.gz')

And i get

NLTK was unable to find stanford-ner.jar! Set the CLASSPATH
  environment variable.

This is what my .bashrc looks like in ubuntu

export CLASSPATH=/home/wolfgang/Downloads/stanford-ner-2015-04-20/stanford-ner-3.5.2.jar
export STANFORD_MODELS=/home/wolfgang/Downloads/stanford-ner-2015-04-20/classifiers

Also, i tried printing the environmental variable in python this way

import os
os.environ.get('CLASSPATH')

And i recieve

'/home/wolfgang/Downloads/stanford-ner-2015-04-20/stanford-ner-3.5.2.jar'

Therefore the variables are being SET!

What is wrong then?

Why doe'snt nltk recognize my environmental variables?

http://stackoverflow.com/a/34112695/610569 – alvas Aug 07 '16 at 23:24 — alvas, Aug 07 '16 at 23:24

score 6 · Answer 1 · answered Sep 28 '15 at 10:01

6

change the .jar file and the environmental variable from stanford-ner-3.5.2.jar to stanford-ner.jar

apparently NLTK has a name_pattern variable in nltk_internals.py which only accepts the CLASSPATH if it matches a regex of the value stanford-ner.jar

answered Sep 28 '15 at 10:01

wolfgang

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or you could simply set the classpath to the parent folder too like `os.environ['CLASSPATH'] = "/home/wolfgang/Downloads/stanford-ner-2015-04-20"`. Both these options(parent folder or stanford-ner.jar) worked for me. – psun Mar 16 '16 at 05:03

score 2 · Answer 2 · edited Nov 27 '15 at 19:38

This is the correct way to set PATH:

st = StanfordNERTagger('C:\Python26\Lib\stanford-ner\classifiers\english.all.3class.distsim.crf.ser.gz','C:\Python26\Lib\stanford-ner\stanford-ner.jar')

Give the correct path to locate both file. If there is still a Java Environment variable error, then it means your Java Environment is not configured. To set this, go to 'My Computer -> Properties -> Advanced Setting'. There are videos showing what these settings do. Once you've done this, if the environment is properly set then when you run the python file a black command window will splash for around ten seconds while it processes your file. This should return your result without error.

score 0 · Answer 3 · edited Jun 20 '20 at 09:12

0

Here is my Code:

from nltk.tag import StanfordNERTagger
import os

os.getenv('CLASSPATH')

OUTPUT: '/home/user/Downloads/stanford-ner.jar'

from nltk.tokenize import sent_tokenize, word_tokenize

st = StanfordNERTagger("english.all.3class.distsim.crf.ser.gz")

Download stanford-ner.jar from here

Set Classpath export CLASSPATH=/home/admin-pc/Downloads/

Worked For Me :p

edited Jun 20 '20 at 09:12

Community

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answered Apr 18 '17 at 14:55

Patel

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NLTK: why does nltk not recognize the CLASSPATH variable for stanford-ner?

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