add introduction of fst hotwords

雾聪

2024-01-01 f047ff8aa4fb11215a3eb5a425fee77ff72e5dba

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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
 
#include <fst/extensions/linear/linear-fst.h>
#include <fst/register.h>
 
using fst::LinearClassifierFst;
using fst::StdArc;
using fst::LogArc;
 
REGISTER_FST(LinearClassifierFst, StdArc);
REGISTER_FST(LinearClassifierFst, LogArc);