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authorChris Dyer <redpony@gmail.com>2014-03-18 01:41:17 -0400
committerChris Dyer <redpony@gmail.com>2014-03-18 01:41:17 -0400
commit606e3e38b8a830dbbe65963ebf6c5ce7866b7800 (patch)
tree332cec5e0b4c8e3b8d6cc0d631fe5d5815f088f6 /decoder/exp_semiring.h
parentcc87bfed0697583b7c11243913254dde3c0047d4 (diff)
star function
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diff --git a/decoder/exp_semiring.h b/decoder/exp_semiring.h
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-#ifndef _EXP_SEMIRING_H_
-#define _EXP_SEMIRING_H_
-
-#include <iostream>
-
-// this file implements the first-order expectation semiring described
-// in Li & Eisner (EMNLP 2009)
-
-// requirements:
-// RType * RType ==> RType
-// PType * PType ==> PType
-// RType * PType ==> RType
-// good examples:
-// PType scalar, RType vector
-// BAD examples:
-// PType vector, RType scalar
-template <class PType, class RType>
-struct PRPair {
- PRPair() : p(), r() {}
- // Inside algorithm requires that T(0) and T(1)
- // return the 0 and 1 values of the semiring
- explicit PRPair(double x) : p(x), r() {}
- PRPair(const PType& p, const RType& r) : p(p), r(r) {}
- PRPair& operator+=(const PRPair& o) {
- p += o.p;
- r += o.r;
- return *this;
- }
- PRPair& operator*=(const PRPair& o) {
- r = (o.r * p) + (o.p * r);
- p *= o.p;
- return *this;
- }
- PType p;
- RType r;
-};
-
-template <class P, class R>
-std::ostream& operator<<(std::ostream& o, const PRPair<P,R>& x) {
- return o << '<' << x.p << ", " << x.r << '>';
-}
-
-template <class P, class R>
-const PRPair<P,R> operator+(const PRPair<P,R>& a, const PRPair<P,R>& b) {
- PRPair<P,R> result = a;
- result += b;
- return result;
-}
-
-template <class P, class R>
-const PRPair<P,R> operator*(const PRPair<P,R>& a, const PRPair<P,R>& b) {
- PRPair<P,R> result = a;
- result *= b;
- return result;
-}
-
-template <class P, class PWeightFunction, class R, class RWeightFunction>
-struct PRWeightFunction {
- explicit PRWeightFunction(const PWeightFunction& pwf = PWeightFunction(),
- const RWeightFunction& rwf = RWeightFunction()) :
- pweight(pwf), rweight(rwf) {}
- PRPair<P,R> operator()(const HG::Edge& e) const {
- const P p = pweight(e);
- const R r = rweight(e);
- return PRPair<P,R>(p, r * p);
- }
- const PWeightFunction pweight;
- const RWeightFunction rweight;
-};
-
-#endif