1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
#!/usr/bin/env python
from cmusphinx import hmm, s3model, s2mfc
import unittest
from cmusphinx.feat import _1s_c_d_dd
import os
from math import log
class TestHMM(unittest.TestCase):
def setUp(self):
thisdir = os.path.dirname(__file__)
self.testdir = os.path.join(thisdir, 'data', 'tidigits')
self.acmod = s3model.S3Model(self.testdir)
def test_create(self):
h1 = hmm.HMM(self.acmod.mdef.pid2sseq(352),
self.acmod.tmat[self.acmod.mdef.pid2tmat(352)])
def test_forward_backward(self):
pid = self.acmod.mdef.phone_id('SIL')
h1 = hmm.HMM(self.acmod.mdef.pid2sseq(pid),
self.acmod.tmat[self.acmod.mdef.pid2tmat(pid)])
mfcc = s2mfc.open(os.path.join(self.testdir, 'man.ah.111a.mfc')).getall()
mfcc -= mfcc.mean(0)
feat = _1s_c_d_dd.compute(mfcc)
alpha = None
self.alpha = []
for f in feat[0:50]:
senscr = self.acmod.senone_compute(h1.iter_senones(), f)
alpha = hmm.forward_evaluate(h1, senscr, alpha)
self.alpha.append(alpha)
beta = None
self.beta = []
for f in feat[50:0:-1]: # Note that this is time-shifted by
# one from the forward pass above
senscr = self.acmod.senone_compute(h1.iter_senones(), f)
beta = hmm.backward_evaluate(h1, senscr, beta)
self.beta.append(beta)
self.beta.reverse()
ll = 0
for a, b in zip(self.alpha, self.beta):
newll = sum(a*b)
if ll != 0:
self.assertTrue(abs(log(ll) - log(newll)) < 0.1)
ll = newll
class TestPhoneHMM(unittest.TestCase):
def setUp(self):
thisdir = os.path.dirname(__file__)
self.testdir = os.path.join(thisdir, 'data', 'tidigits')
self.acmod = s3model.S3Model(self.testdir)
self.factory = hmm.PhoneHMMFactory(self.acmod)
def test_create(self):
pid = self.acmod.mdef.phone_id('OW_four', 'F_four', 'R_four')
h1 = hmm.HMM(self.acmod.mdef.pid2sseq(pid),
self.acmod.tmat[self.acmod.mdef.pid2tmat(pid)])
h2 = self.factory.create('OW_four', 'F_four', 'R_four')
self.assertEqual(h1[0], h2[0])
class TestHMMGraph(unittest.TestCase):
def setUp(self):
thisdir = os.path.dirname(__file__)
self.testdir = os.path.join(thisdir, 'data', 'tidigits')
self.acmod = s3model.S3Model(self.testdir)
self.factory = hmm.PhoneHMMFactory(self.acmod)
def test_create(self):
h1 = self.factory.create('F_four', 'SIL', 'OW_four')
h2 = self.factory.create('OW_four', 'F_four', 'R_four')
h3 = self.factory.create('R_four', 'OW_four', 'SIL')
hg = hmm.HMMGraph(h1, h2, h3)
self.assertEqual(hg[0], h1[0])
self.assertEqual(hg[4], h2[0])
self.assertEqual(hg[8], h3[0])
def test_forward_backward(self):
mfcc = s2mfc.open(os.path.join(self.testdir, 'man.ah.111a.mfc')).getall()
mfcc -= mfcc.mean(0)
feat = _1s_c_d_dd.compute(mfcc)
hg = hmm.HMMGraph(self.factory.create('SIL'),
self.factory.create('SIL'))
alpha = None
self.alpha = []
for f in feat[0:15]:
senscr = self.acmod.senone_compute(hg.iter_senones(), f)
alpha = hmm.forward_evaluate(hg, senscr, alpha)
self.alpha.append(alpha)
beta = None
self.beta = []
for f in feat[15:0:-1]: # Note that this is time-shifted by
# one from the forward pass above
senscr = self.acmod.senone_compute(hg.iter_senones(), f)
beta = hmm.backward_evaluate(hg, senscr, beta)
self.beta.append(beta)
self.beta.reverse()
ll = 0
for a,b in zip(self.alpha, self.beta):
newll = sum(a*b)
if ll != 0:
self.assertTrue(abs(log(ll) - log(newll)) < 0.1)
ll = newll
def read_dict(dictfile):
fh = open(dictfile)
out = {}
for spam in fh:
eggs = spam.rstrip().split()
word = eggs[0]
phones = eggs[1:]
out[word] = phones
return out
class TestSentenceHMM(unittest.TestCase):
def setUp(self):
thisdir = os.path.dirname(__file__)
self.testdir = os.path.join(thisdir, 'data', 'tidigits')
acmod = s3model.new(self.testdir)
dictionary = read_dict(os.path.join(self.testdir, 'dictionary'))
self.factory = hmm.SentenceHMMFactory(acmod, dictionary)
if __name__ == '__main__':
unittest.main()
|
