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Return keywords before matrix processing if no graph edges. Fixes #2075 #2154

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Aug 10, 2018
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Return keywords before matrix processing if no graph edges. Fixes #2075 #2154

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fdd9081
Return keywords before matrix processing if no graph edges.
lshostenko Aug 10, 2018
7933111
Add testcase for empty graph.
lshostenko Aug 10, 2018
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3 changes: 3 additions & 0 deletions gensim/summarization/keywords.py
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Original file line number Diff line number Diff line change
Expand Up @@ -512,6 +512,9 @@ def keywords(text, ratio=0.2, words=None, split=False, scores=False, pos_filter=

_remove_unreachable_nodes(graph)

if not graph.edges():
return _format_results([], [], split, scores)

# Ranks the tokens using the PageRank algorithm. Returns dict of lemma -> score
pagerank_scores = _pagerank(graph)

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6 changes: 6 additions & 0 deletions gensim/test/test_keywords.py
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Expand Up @@ -95,6 +95,12 @@ def test_text_keywords_with_small_graph(self):
kwds = keywords(text, words=1, split=True)
self.assertTrue(len(kwds))

def test_text_keywords_without_graph_edges(self):
# regression test, we get graph with no edges on this text
text = 'Sitio construcción. Estaremos línea.'
kwds = keywords(text, deacc=False, scores=True)
self.assertFalse(len(kwds))


if __name__ == '__main__':
logging.basicConfig(format='%(asctime)s : %(levelname)s : %(message)s', level=logging.DEBUG)
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