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// product-weight.h
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright 2005-2010 Google, Inc.
// Author: riley@google.com (Michael Riley)
//
// \file
// Product weight set and associated semiring operation definitions.
#ifndef FST_LIB_PRODUCT_WEIGHT_H__
#define FST_LIB_PRODUCT_WEIGHT_H__
#include <stack>
#include <string>
#include <fst/pair-weight.h>
#include <fst/weight.h>
namespace fst {
// Product semiring: W1 * W2
template<class W1, class W2>
class ProductWeight : public PairWeight<W1, W2> {
public:
using PairWeight<W1, W2>::Zero;
using PairWeight<W1, W2>::One;
using PairWeight<W1, W2>::NoWeight;
using PairWeight<W1, W2>::Quantize;
using PairWeight<W1, W2>::Reverse;
typedef ProductWeight<typename W1::ReverseWeight, typename W2::ReverseWeight>
ReverseWeight;
ProductWeight() {}
ProductWeight(const PairWeight<W1, W2>& w) : PairWeight<W1, W2>(w) {}
ProductWeight(W1 w1, W2 w2) : PairWeight<W1, W2>(w1, w2) {}
static const ProductWeight<W1, W2> &Zero() {
static const ProductWeight<W1, W2> zero(PairWeight<W1, W2>::Zero());
return zero;
}
static const ProductWeight<W1, W2> &One() {
static const ProductWeight<W1, W2> one(PairWeight<W1, W2>::One());
return one;
}
static const ProductWeight<W1, W2> &NoWeight() {
static const ProductWeight<W1, W2> no_weight(
PairWeight<W1, W2>::NoWeight());
return no_weight;
}
static const string &Type() {
static const string type = W1::Type() + "_X_" + W2::Type();
return type;
}
static uint64 Properties() {
uint64 props1 = W1::Properties();
uint64 props2 = W2::Properties();
return props1 & props2 & (kLeftSemiring | kRightSemiring |
kCommutative | kIdempotent);
}
ProductWeight<W1, W2> Quantize(float delta = kDelta) const {
return PairWeight<W1, W2>::Quantize(delta);
}
ReverseWeight Reverse() const {
return PairWeight<W1, W2>::Reverse();
}
};
template <class W1, class W2>
inline ProductWeight<W1, W2> Plus(const ProductWeight<W1, W2> &w,
const ProductWeight<W1, W2> &v) {
return ProductWeight<W1, W2>(Plus(w.Value1(), v.Value1()),
Plus(w.Value2(), v.Value2()));
}
template <class W1, class W2>
inline ProductWeight<W1, W2> Times(const ProductWeight<W1, W2> &w,
const ProductWeight<W1, W2> &v) {
return ProductWeight<W1, W2>(Times(w.Value1(), v.Value1()),
Times(w.Value2(), v.Value2()));
}
template <class W1, class W2>
inline ProductWeight<W1, W2> Divide(const ProductWeight<W1, W2> &w,
const ProductWeight<W1, W2> &v,
DivideType typ = DIVIDE_ANY) {
return ProductWeight<W1, W2>(Divide(w.Value1(), v.Value1(), typ),
Divide(w.Value2(), v.Value2(), typ));
}
} // namespace fst
#endif // FST_LIB_PRODUCT_WEIGHT_H__
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