48 template <class X1, class X2>
49 class ExpectationWeight : public PairWeight<X1, X2> {
51   using PairWeight<X1, X2>::Value1;
52   using PairWeight<X1, X2>::Value2;
54   using PairWeight<X1, X2>::Reverse;
55   using PairWeight<X1, X2>::Quantize;
56   using PairWeight<X1, X2>::Member;
59   typedef X2 W2;
62                             typename X2::ReverseWeight> ReverseWeight;
64   ExpectationWeight() : PairWeight<X1, X2>(Zero()) { }  in ExpectationWeight()
66   ExpectationWeight(const ExpectationWeight<X1, X2>& w)  in ExpectationWeight()
67       : PairWeight<X1, X2> (w) { }  in ExpectationWeight()
69   ExpectationWeight(const PairWeight<X1, X2>& w)  in ExpectationWeight()
70       : PairWeight<X1, X2> (w) { }  in ExpectationWeight()
72   ExpectationWeight(const X1& x1, const X2& x2)  in ExpectationWeight()
73       : PairWeight<X1, X2>(x1, x2) { }  in ExpectationWeight()
75   static const ExpectationWeight<X1, X2> &Zero() {  in Zero()
76     static const ExpectationWeight<X1, X2> zero(X1::Zero(), X2::Zero());  in Zero()
80   static const ExpectationWeight<X1, X2> &One() {  in One()
81     static const ExpectationWeight<X1, X2> one(X1::One(), X2::Zero());  in One()
85   static const ExpectationWeight<X1, X2> &NoWeight() {  in NoWeight()
86     static const ExpectationWeight<X1, X2> no_weight(X1::NoWeight(),  in NoWeight()
87                                                      X2::NoWeight());  in NoWeight()
92     static const string type = "expectation_" + X1::Type() + "_" + X2::Type();  in Type()
96   PairWeight<X1, X2> Quantize(float delta = kDelta) const {
97     return PairWeight<X1, X2>::Quantize();
101     return PairWeight<X1, X2>::Reverse();  in Reverse()
105     return PairWeight<X1, X2>::Member();  in Member()
116 template <class X1, class X2>
117 inline ExpectationWeight<X1, X2> Plus(const ExpectationWeight<X1, X2> &w,  in Plus()
118                                       const ExpectationWeight<X1, X2> &v) {  in Plus()
119   return ExpectationWeight<X1, X2>(Plus(w.Value1(), v.Value1()),  in Plus()
124 template <class X1, class X2>
125 inline ExpectationWeight<X1, X2> Times(const ExpectationWeight<X1, X2> &w,  in Times()
126                                        const ExpectationWeight<X1, X2> &v) {  in Times()
127   return ExpectationWeight<X1, X2>(Times(w.Value1(), v.Value1()),  in Times()
132 template <class X1, class X2>
133 inline ExpectationWeight<X1, X2> Divide(const ExpectationWeight<X1, X2> &w,
134                                         const ExpectationWeight<X1, X2> &v,
137   return ExpectationWeight<X1, X2>::NoWeight();