Initial commit: FunASR Speech Recognition Toolkit

Add complete FunASR codebase including models, runtime, and documentation.
2026-07-09 22:38:58 +08:00
commit 6116b1f3c6
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+// fstext/prune-special.h
+
+// Copyright 2014  Johns Hopkins University (author: Daniel Povey)
+
+// See ../../COPYING for clarification regarding multiple authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+// MERCHANTABLITY OR NON-INFRINGEMENT.
+// See the Apache 2 License for the specific language governing permissions and
+// limitations under the License.
+
+
+#ifndef KALDI_FSTEXT_PRUNE_SPECIAL_H_
+#define KALDI_FSTEXT_PRUNE_SPECIAL_H_
+
+#include "fst/fstlib.h"
+#include "fstext/lattice-weight.h"
+#include "fstext/factor.h"
+
+namespace fst {
+
+
+
+/**
+   The function PruneSpecial is like the standard OpenFst function "prune",
+   except it does not expand the entire "ifst"- this is useful for cases where
+   ifst is an on-demand FST such as a ComposeFst and we don't want to visit
+   it all.  It supports pruning either to a specified beam (if beam is
+   not One()), or to a specified max_states (if max_states is > 0).  One of the
+   two must be specified.
+
+   Requirements:
+     - Costs must be non-negative (equivalently, weights must not be greater than One()).
+     - There must be a Compare(a, b) function that compares two weights and returns (-1,0,1)
+       if (a<b, a=b, a>b).  We define this in Kaldi, for TropicalWeight, LogWeight (I think),
+       and LatticeWeight... also CompactLatticeWeight, but we doubt that will be used here;
+       better to use PruneCompactLattice().
+ */
+
+template<class Arc>
+void PruneSpecial(const Fst<Arc> &ifst,
+                  VectorFst<Arc> *ofst,
+                  typename Arc::Weight beam,
+                  size_t max_states =  0);
+
+
+
+} // end namespace fst
+
+#include "fstext/prune-special-inl.h"
+
+#endif  // KALDI_FSTEXT_PRUNE_SPECIAL_H_