Failed to reach final state in alignment #339
Description
I am using Python PocketSphinx 5.0.0 for US English forced alignment. Unfortunately, I am frequently encountering the following error when doing alignments, despite the transcript being correct and the recording being free of noise.
ERROR: "state_align_search.c", line 228: Failed to reach final state in alignment
Failed on second-pass alignment: Failed to stop utterance processing
The following is a code snippet from my project which does the actual alignment using PocketSphinx.
if self._transcript:
try:
self.decoder.start_utt()
self.decoder.process_raw(raw_audio, full_utt=True)
self.decoder.end_utt()
except RuntimeError as e:
print(f'Failed on first-pass alignment: {e}')
try:
self.decoder.set_alignment()
except RuntimeError as e:
print(f'Failed to set alignment: {e}')
try:
self.decoder.start_utt()
self.decoder.process_raw(raw_audio, full_utt=True)
self.decoder.end_utt()
except RuntimeError as e:
print(f'Failed on second-pass alignment: {e}')
self.alignment = self.parse_alignment(self.decoder.get_alignment())
As you can see, the final try-except block is being tripped.
Is there a way to loosen some parameters in PocketSphinx so that it can at least produce an alignment (even if suboptimal) without throwing an exception? I cannot find anything in the docs.
P.S. I am aware that there are better tools out there for FA, but this lightweight library is expedient to work with at the moment.
Thanks in advance for any advice.