Incorrect lemmatization of word "using" (lemmatizes as "used")

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python

Research direction

Start by reproducing the reported results with pattern.en.lemma("using") and conjugate("using", "1sg"), then compare them with the expected lemma "use" and the behavior of "amusing" and "amuse". Done means "using" is lemmatized as "use" and conjugation no longer returns "used".

Written by the indexing model from the issue text.

Description

The word "using" is lemmatized incorrectly:

import pattern.en

print("using", pattern.en.lemma("using"))
print("use", pattern.en.lemma("use"))

The result is:

using used
use use

For comparison, both amusing and amuse return the same lemma amuse.

This issue, in turn, breaks conjugation, so that conjugate("using", "1sg") returns used.

Dominant language
Python
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