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import unittest
from nltk.metrics.agreement import AnnotationTask
class TestDisagreement(unittest.TestCase):
"""
Class containing unit tests for nltk.metrics.agreement.Disagreement.
"""
def test_easy(self):
"""
Simple test, based on
https://github.com/foolswood/krippendorffs_alpha/raw/master/krippendorff.pdf.
"""
data = [
("coder1", "dress1", "YES"),
("coder2", "dress1", "NO"),
("coder3", "dress1", "NO"),
("coder1", "dress2", "YES"),
("coder2", "dress2", "NO"),
("coder3", "dress3", "NO"),
]
annotation_task = AnnotationTask(data)
self.assertAlmostEqual(annotation_task.alpha(), -0.3333333)
def test_easy2(self):
"""
Same simple test with 1 rating removed.
Removal of that rating should not matter: K-Apha ignores items with
only 1 rating.
"""
data = [
("coder1", "dress1", "YES"),
("coder2", "dress1", "NO"),
("coder3", "dress1", "NO"),
("coder1", "dress2", "YES"),
("coder2", "dress2", "NO"),
]
annotation_task = AnnotationTask(data)
self.assertAlmostEqual(annotation_task.alpha(), -0.3333333)
def test_advanced(self):
"""
More advanced test, based on
http://www.agreestat.com/research_papers/onkrippendorffalpha.pdf
"""
data = [
("A", "1", "1"),
("B", "1", "1"),
("D", "1", "1"),
("A", "2", "2"),
("B", "2", "2"),
("C", "2", "3"),
("D", "2", "2"),
("A", "3", "3"),
("B", "3", "3"),
("C", "3", "3"),
("D", "3", "3"),
("A", "4", "3"),
("B", "4", "3"),
("C", "4", "3"),
("D", "4", "3"),
("A", "5", "2"),
("B", "5", "2"),
("C", "5", "2"),
("D", "5", "2"),
("A", "6", "1"),
("B", "6", "2"),
("C", "6", "3"),
("D", "6", "4"),
("A", "7", "4"),
("B", "7", "4"),
("C", "7", "4"),
("D", "7", "4"),
("A", "8", "1"),
("B", "8", "1"),
("C", "8", "2"),
("D", "8", "1"),
("A", "9", "2"),
("B", "9", "2"),
("C", "9", "2"),
("D", "9", "2"),
("B", "10", "5"),
("C", "10", "5"),
("D", "10", "5"),
("C", "11", "1"),
("D", "11", "1"),
("C", "12", "3"),
]
annotation_task = AnnotationTask(data)
self.assertAlmostEqual(annotation_task.alpha(), 0.743421052632)
def test_advanced2(self):
"""
Same more advanced example, but with 1 rating removed.
Again, removal of that 1 rating should not matter.
"""
data = [
("A", "1", "1"),
("B", "1", "1"),
("D", "1", "1"),
("A", "2", "2"),
("B", "2", "2"),
("C", "2", "3"),
("D", "2", "2"),
("A", "3", "3"),
("B", "3", "3"),
("C", "3", "3"),
("D", "3", "3"),
("A", "4", "3"),
("B", "4", "3"),
("C", "4", "3"),
("D", "4", "3"),
("A", "5", "2"),
("B", "5", "2"),
("C", "5", "2"),
("D", "5", "2"),
("A", "6", "1"),
("B", "6", "2"),
("C", "6", "3"),
("D", "6", "4"),
("A", "7", "4"),
("B", "7", "4"),
("C", "7", "4"),
("D", "7", "4"),
("A", "8", "1"),
("B", "8", "1"),
("C", "8", "2"),
("D", "8", "1"),
("A", "9", "2"),
("B", "9", "2"),
("C", "9", "2"),
("D", "9", "2"),
("B", "10", "5"),
("C", "10", "5"),
("D", "10", "5"),
("C", "11", "1"),
("D", "11", "1"),
("C", "12", "3"),
]
annotation_task = AnnotationTask(data)
self.assertAlmostEqual(annotation_task.alpha(), 0.743421052632)
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