How we actually measure latency in kaldi online

[ita...@gmail.com]

I’m trying to measure real-time performance in kaldi , and got stuck with measuring latency. 

I’m running server side with “online2-tcp-nnet3-decode-faster”     , and stream wav by “sox <wav> -t wav -r 8000 -b 16 - | /usr/bin/nc <hostname> <port> “  on the client side.

 I don’t find any internal calculation of latency , and I don’t have timestamp in either side of the transcription.  

 

I tried to increase the verbose level  in kaldi  “online2-tcp-nnet3-decode-faster”      , and got logs messages  about the initial and final transcription of each “segments” 

there is   --produce-time=true   option which is nice , it adds timestamp in the audio itself , but does not help me figure up how much time it was processed. 

maybe  adding somehow timestamp of the logs in kaldi , i'm not sure how 

thanks everyone , 

Itai 

 

Beside adding the calculation in the  “online2-tcp-nnet3-decode-faster.cc”        , do you know on fast way to measure latency in kaldi ? 

[Daniel Povey]

Getting effective latency might be easier to do from the client side.

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[Itai Peer]

yep , and it becomes a question of how to stream it.. 

thanks Dan 

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Itai Peer