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#!/usr/bin/python
import unittest
import os
from pocketsphinx import Decoder, NGramModel
DATADIR = os.path.join(os.path.dirname(__file__), "../../test/data")
class TestLM(unittest.TestCase):
def test_lm(self):
# Create a decoder with a broken dictionary
decoder = Decoder(dict=os.path.join(DATADIR, "defective.dic"))
decoder.start_utt()
with open(os.path.join(DATADIR, "goforward.raw"), "rb") as stream:
while True:
buf = stream.read(1024)
if buf:
decoder.process_raw(buf, False, False)
else:
break
decoder.end_utt()
print("Decoding with default settings:", decoder.hyp().hypstr)
self.assertEqual("", decoder.hyp().hypstr)
# Load "turtle" language model and decode again.
lm = NGramModel(
decoder.config,
decoder.logmath,
os.path.join(DATADIR, "turtle.lm.bin"),
)
print(lm.prob(["you"]))
print(lm.prob(["are", "you"]))
print(lm.prob(["you", "are", "what"]))
print(lm.prob(["lost", "are", "you"]))
decoder.add_lm("turtle", lm)
self.assertNotEqual(decoder.current_search(), "turtle")
decoder.activate_search("turtle")
self.assertEqual(decoder.current_search(), "turtle")
decoder.start_utt()
with open(os.path.join(DATADIR, "goforward.raw"), "rb") as stream:
while True:
buf = stream.read(1024)
if buf:
decoder.process_raw(buf, False, False)
else:
break
decoder.end_utt()
print('Decoding with "turtle" language:', decoder.hyp().hypstr)
self.assertEqual("", decoder.hyp().hypstr)
# The word 'meters' isn't in the loaded dictionary.
# Let's add it manually.
decoder.add_word("foobie", "F UW B IY", False)
decoder.add_word("meters", "M IY T ER Z", True)
decoder.start_utt()
with open(os.path.join(DATADIR, "goforward.raw"), "rb") as stream:
while True:
buf = stream.read(1024)
if buf:
decoder.process_raw(buf, False, False)
else:
break
decoder.end_utt()
print("Decoding with customized language:", decoder.hyp().hypstr)
self.assertEqual("foobie meters meters", decoder.hyp().hypstr)
if __name__ == "__main__":
unittest.main()
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