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Try playing with the logfn parameter:

E.g. from http://stackoverflow.com/questions/17825820/how-do-i-turn-off-e-info-in-pocketsphinx:

pocketsphinx_continuous -logfn /dev/null

Or write to file:

pocketsphinx_continuous -logfn [file]

In python (what ros pocketsphinx is using), from https://mattze96.safe-ws.de/blog/?p=640:

self.asr.set_property('logfn', '/dev/null')

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