Extract relationships from a sentence in NLTK

Question

I am using NLTK to extract the relationship between a PERSON and an ORGANIZATION.

Also, I want to extract the relationship between ORGANIZATION and LOCATION. The NLTK version is 3.2.1.

I've made use of Part-Of-Speech tagging and Named Entity Recognition (NER). Also the Parse Tree is drawn for the NER results.
But I am not able to extract the mentioned relationships from that sentence.

Here is the code:

import nltk, re
from nltk import word_tokenize

sentence = "Mark works at JPMC in London every day"
pos_tags = nltk.pos_tag(word_tokenize(sentence))            # POS tagging of the sentence
ne = nltk.ne_chunk(pos_tags)                                # Named Entity Recognition
ne.draw()                                                   # Draw the Parse Tree

IN = re.compile(r'.*\bin\b(?!\b.+ing)')
for rel1 in nltk.sem.extract_rels('PER', 'ORG', pos_tags, pattern = IN):
    print(nltk.sem.rtuple(rel1))
for rel2 in nltk.sem.extract_rels('ORG', 'LOC', pos_tags, pattern = IN):
    print(nltk.sem.rtuple(rel2))

How to extract 'Person - Organization' relationship and 'Organization - Location' relationship?

Answer 1

I think docs is not tagged pos, it should be NE.

Working code

senten = "Mark works in JPMC in London every day"
pos_tags = nltk.pos_tag(word_tokenize(senten))  # POS tagging of the sentence
ne = nltk.ne_chunk(pos_tags)  # Named Entity Recognition

chunked = nltk.ne_chunk_sents(pos_tags, binary=True)
# ne.draw()  # Draw the Parse Tree


print(pos_tags)

IN = re.compile(r'.*\bin\b(?!\b.+ing)')

for rel in nltk.sem.extract_rels('PERSON', 'ORGANIZATION', ne, corpus='ace', pattern=IN):
    print(nltk.sem.rtuple(rel))

Output

[PER: 'Mark/NNP'] 'works/VBZ in/IN' [ORG: 'JPMC/NNP']