nltk StanfordNERTagger : NoClassDefFoundError: org/slf4j/LoggerFactory (In Windows)

Question

NOTE: I am using Python 2.7 as part of Anaconda distribution. I hope this is not a problem for nltk 3.1.

I am trying to use nltk for NER as

import nl         


        

Answer 1

For those who want to use Stanford NER >= 3.6.0 instead of the 2015-01-30 (3.5.1) or other old version, do this instead:

1. Put the stanford-ner.jar and slf4j-api.jar into the same folder

   For example, I put the following files to /path-to-libs/

   • stanford-ner-3.6.0.jar
   • slf4j-api-1.7.18.jar

2. Then:

   classpath = "/path-to-libs/*"
   
   st = nltk.tag.StanfordNERTagger(
       "/path-to-model/ner-model.ser.gz",
       "/path-to-libs/stanford-ner-3.6.0.jar"
   )
   st._stanford_jar = classpath
   result = st.tag(["Hello"])