def test_tag2(self):
tagset = {'D', 'N', 'V'}
trans = {
('<s>', '<s>'): {
'D': 1.0
},
('<s>', 'D'): {
'N': 1.0
},
('D', 'N'): {
'V': 0.8,
'N': 0.2
},
('N', 'N'): {
'V': 1.0
},
('N', 'V'): {
'</s>': 1.0
},
}
out = {
'D': {
'the': 1.0
},
'N': {
'dog': 0.4,
'barks': 0.6
},
'V': {
'dog': 0.1,
'barks': 0.9
},
}
hmm = HMM(3, tagset, trans, out)
tagger = ViterbiTagger(hmm)
x = 'the dog barks'.split()
y = tagger.tag(x)
pi = {
0: {
('<s>', '<s>'): (log2(1.0), []),
},
1: {
('<s>', 'D'): (log2(1.0), ['D']),
},
2: {
('D', 'N'): (log2(0.4), ['D', 'N']),
},
3: {
('N', 'V'): (log2(0.8 * 0.4 * 0.9), ['D', 'N', 'V']),
('N', 'N'): (log2(0.2 * 0.4 * 0.6), ['D', 'N', 'N']),
}
}
self.assertEqualPi(tagger._pi, pi)
self.assertEqual(y, 'D N V'.split())
def setUp(self):
tagset = {'D', 'N', 'V'}
trans = {
('<s>', '<s>'): {'D': 1.0},
('<s>', 'D'): {'N': 1.0},
('D', 'N'): {'V': 1.0},
('N', 'V'): {'</s>': 1.0},
}
out = {
'D': {'the': 1.0},
'N': {'dog': 0.4, 'barks': 0.6},
'V': {'dog': 0.1, 'barks': 0.9},
}
hmm = HMM(3, tagset, trans, out)
self.tagger = ViterbiTagger(hmm)
def test_viterbi_tagger(self):
hmm = MLHMM(2, self.tagged_sents, addone=False)
# XXX: or directly test hmm.tag?
tagger = ViterbiTagger(hmm)
y = tagger.tag('el gato come pescado .'.split())
pi = {
0: {
('<s>', ): (0.0, []),
},
1: {
# 0.5 for el/D
(
'D', ): (log2(0.5), ['D']),
},
2: {
# 0.25 for gato/N
(
'N', ): (log2(0.5 * 0.25), ['D', 'N']),
},
3: {
# 0.5 for V after N
(
'V', ): (log2(0.5 * 0.25 * 0.5), ['D', 'N', 'V']),
},
4: {
# 0.25 for pescado/N
(
'N', ):
(log2(0.5 * 0.25 * 0.5 * 0.25), ['D', 'N', 'V', 'N']),
},
5: {
# 0.5 for P after N
(
'P', ): (log2(0.5 * 0.25 * 0.5 * 0.25 * 0.5),
['D', 'N', 'V', 'N', 'P']),
}
}
self.assertEqualPi(tagger._pi, pi)
self.assertEqual(y, 'D N V N P'.split())
