chore: import upstream snapshot with attribution

2026-07-13 13:25:10 +08:00
commit c397331b1e
3684 changed files with 990993 additions and 0 deletions
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+// decoder/decodable-sum.h
+
+// Copyright 2009-2011  Saarland University;  Microsoft Corporation;
+//                      Lukas Burget, Pawel Swietojanski
+
+// 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_DECODER_DECODABLE_SUM_H_
+#define KALDI_DECODER_DECODABLE_SUM_H_
+
+#include <vector>
+#include <utility>
+
+#include "base/kaldi-common.h"
+#include "itf/decodable-itf.h"
+
+namespace kaldi {
+
+// The DecodableSum object is a very simple object that just sums
+// scores over a number of Decodable objects.  They must all have
+// the same dimensions.
+
+class DecodableSum: public DecodableInterface {
+ public:
+  // Does not take ownership of pointers!  They are just
+  // pointers because they are non-const.
+  DecodableSum(DecodableInterface *d1, BaseFloat w1,
+               DecodableInterface *d2, BaseFloat w2) {
+    decodables_.push_back(std::make_pair(d1, w1));
+    decodables_.push_back(std::make_pair(d2, w2));
+    CheckSizes();
+  }
+
+  // Does not take ownership of pointers!
+  DecodableSum(
+      const std::vector<std::pair<DecodableInterface*, BaseFloat> > &decodables) :
+      decodables_(decodables) { CheckSizes(); }
+
+  void CheckSizes() const {
+    KALDI_ASSERT(decodables_.size() >= 1
+                 && decodables_[0].first != NULL);
+    for (size_t i = 1; i < decodables_.size(); i++)
+      KALDI_ASSERT(decodables_[i].first != NULL &&
+                   decodables_[i].first->NumIndices() ==
+                   decodables_[0].first->NumIndices());
+  }
+
+  // Note, frames are numbered from zero.  But state_index is numbered
+  // from one (this routine is called by FSTs).
+  virtual BaseFloat LogLikelihood(int32 frame, int32 state_index) {
+    BaseFloat sum = 0.0;
+    // int32 i=1;
+    for (std::vector<std::pair<DecodableInterface*, BaseFloat> >::iterator iter = decodables_.begin();
+         iter != decodables_.end();
+         ++iter) {
+      sum += iter->first->LogLikelihood(frame, state_index) * iter->second;
+     }
+    return sum;
+  }
+
+  virtual int32 NumIndices() const { return decodables_[0].first->NumIndices(); }
+
+  virtual bool IsLastFrame(int32 frame) const {
+    // We require all the decodables have the same #frames.  We don't check this though.
+    return decodables_[0].first->IsLastFrame(frame);
+  }
+
+ private:
+  std::vector<std::pair<DecodableInterface*, BaseFloat> > decodables_;
+  KALDI_DISALLOW_COPY_AND_ASSIGN(DecodableSum);
+};
+
+class DecodableSumScaled : public DecodableSum {
+ public:
+  DecodableSumScaled(DecodableInterface *d1, BaseFloat w1,
+                     DecodableInterface *d2, BaseFloat w2,
+                     BaseFloat scale)
+    : DecodableSum(d1, w1, d2, w2), scale_(scale) {}
+
+  DecodableSumScaled(const std::vector<std::pair<DecodableInterface*, BaseFloat> > &decodables,
+                     BaseFloat scale)
+    : DecodableSum(decodables), scale_(scale) {}
+
+  virtual BaseFloat LogLikelihood(int32 frame, int32 state_index) {
+    return scale_ * DecodableSum::LogLikelihood(frame, state_index);
+  }
+
+ private:
+  BaseFloat scale_;
+  KALDI_DISALLOW_COPY_AND_ASSIGN(DecodableSumScaled);
+};
+
+}  // namespace kaldi
+
+#endif  // KALDI_DECODER_DECODABLE_SUM_H_
+