sparse vec

git-svn-id: https://mosesdecoder.svn.sourceforge.net/svnroot/mosesdecoder/branches/mira-mtm5@3429 1f5c12ca-751b-0410-a591-d2e778427230
This commit is contained in:
hieuhoang1972 2010-09-14 08:05:22 +00:00
parent c905b49ac0
commit 356c6b1868
3 changed files with 728 additions and 0 deletions

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@ -11,6 +11,8 @@
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moses/src/FeatureVector.cpp Normal file
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/*
Moses - factored phrase-based language decoder
Copyright (C) 2010 University of Edinburgh
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <algorithm>
#include <cassert>
#include <cmath>
#include <fstream>
#include <sstream>
#include <stdexcept>
#include "FeatureVector.h"
using namespace std;
namespace Moses {
const string FName::SEP = "_";
FName::Name2Id FName::name2id;
vector<string> FName::id2name;
void FName::init(const string& name) {
Name2Id::iterator i = name2id.find(name);
if (i != name2id.end()) {
m_id = i->second;
} else {
m_id = name2id.size();
name2id[name] = m_id;
id2name.push_back(name);
}
}
std::ostream& operator<<( std::ostream& out, const FName& name) {
out << name.name();
return out;
}
size_t FName::hash() const {
/*std::size_t seed = 0;
boost::hash_combine(seed, m_root);
boost::hash_combine(seed, m_name);
return seed;*/
return boost::hash_value(m_id);
}
const std::string& FName::name() const {
return id2name[m_id];
}
bool FName::operator==(const FName& rhs) const {
return m_id == rhs.m_id;
}
bool FName::operator!=(const FName& rhs) const {
return ! (*this == rhs);
}
FVector::FVector(FValue defaultValue) {
m_features[DEFAULT_NAME] = defaultValue;
}
void FVector::clear() {
m_features.clear();
m_features[DEFAULT_NAME] = DEFAULT;
}
void FVector::load(const std::string& filename) {
ifstream in (filename.c_str());
if (!in) {
ostringstream msg;
msg << "Unable to open " << filename;
throw runtime_error(msg.str());
}
string line;
while(getline(in,line)) {
if (line[0] == '#') continue;
istringstream linestream(line);
string namestring;
FValue value;
linestream >> namestring;
linestream >> value;
FName fname(namestring);
set(fname,value);
}
}
void FVector::save(const string& filename) const {
ofstream out(filename.c_str());
if (!out) {
ostringstream msg;
msg << "Unable to open " << filename;
throw runtime_error(msg.str());
}
write(out);
out.close();
}
void FVector::write(ostream& out) const {
for (const_iterator i = begin(); i != end(); ++i) {
out << i->first << " " << i->second << endl;
}
}
FName FVector::DEFAULT_NAME("DEFAULT","");
const FValue FVector::DEFAULT = 0;
static bool equalsTolerance(FValue lhs, FValue rhs) {
if (lhs == rhs) return true;
static const FValue TOLERANCE = 1e-4;
FValue diff = abs(lhs-rhs);
FValue mean = (abs(lhs)+abs(rhs))/2;
//cerr << "ET " << lhs << " " << rhs << " " << diff << " " << mean << " " << endl;
return diff/mean < TOLERANCE ;
}
bool FVector::operator== (const FVector& rhs) const {
if (this == &rhs) {
return true;
}
if (get(DEFAULT_NAME) != rhs.get(DEFAULT_NAME)) return false;
for (const_iterator i = begin(); i != end(); ++i) {
if (!equalsTolerance(i->second,rhs.get(i->first))) return false;
}
for (const_iterator i = rhs.begin(); i != rhs.end(); ++i) {
if (!equalsTolerance(i->second, get(i->first))) return false;
}
return true;
}
bool FVector::operator!= (const FVector& rhs) const {
return ! (*this == rhs);
}
ProxyFVector FVector::operator[](const FName& name) {
// At this point, we don't know whether operator[] was called, so we return
// a proxy object and defer the decision until later
return ProxyFVector(this, name);
}
FValue FVector::operator[](const FName& name) const {
return get(name) + get(DEFAULT_NAME);
}
ostream& FVector::print(ostream& out) const {
out << "{";
for (const_iterator i = begin(); i != end(); ++i) {
FValue value = i->second;
if (i->first != DEFAULT_NAME) {
value += get(DEFAULT_NAME);
}
if (i->first != DEFAULT_NAME && i->second != 0.0) {
out << i->first << "=" << value << ", ";
}
}
out << "}";
return out;
}
ostream& operator<<(ostream& out, const FVector& fv) {
return fv.print(out);
}
const FValue& FVector::get(const FName& name) const {
const_iterator fi = m_features.find(name);
if (fi == m_features.end()) {
return DEFAULT;
} else {
return fi->second;
}
}
void FVector::set(const FName& name, const FValue& value) {
m_features[name] = value;
}
FVector& FVector::operator+= (const FVector& rhs) {
//default value will take care of itself here.
for (iterator i = begin(); i != end(); ++i) {
set(i->first,i->second + rhs.get(i->first));
}
for (const_iterator i = rhs.begin(); i != rhs.end(); ++i) {
if (!hasNonDefaultValue(i->first)) {
set(i->first,i->second);
}
}
return *this;
}
FVector& FVector::operator-= (const FVector& rhs) {
for (iterator i = begin(); i != end(); ++i) {
set(i->first,i->second - rhs.get(i->first));
}
for (const_iterator i = rhs.begin(); i != rhs.end(); ++i) {
if (!hasNonDefaultValue(i->first)) {
set(i->first,-(i->second));
}
}
return *this;
}
FVector& FVector::operator*= (const FVector& rhs) {
FValue lhsDefault = get(DEFAULT_NAME);
FValue rhsDefault = rhs.get(DEFAULT_NAME);
for (iterator i = begin(); i != end(); ++i) {
if (i->first == DEFAULT_NAME) {
set(i->first,lhsDefault*rhsDefault);
} else {
FValue lhsValue = i->second;
FValue rhsValue = rhs.get(i->first);
set(i->first, lhsValue*rhsDefault + rhsValue*lhsDefault + lhsValue*rhsValue);
}
}
if (lhsDefault) {
//Features that have the default value in the lhs
for (const_iterator i = rhs.begin(); i != rhs.end(); ++i) {
if (!hasNonDefaultValue(i->first)) {
set(i->first, lhsDefault*i->second);
}
}
}
return *this;
}
FVector& FVector::operator/= (const FVector& rhs) {
FValue lhsDefault = get(DEFAULT_NAME);
FValue rhsDefault = rhs.get(DEFAULT_NAME);
if (lhsDefault && !rhsDefault) {
throw runtime_error("Attempt to divide feature vectors where lhs has default and rhs does not");
}
FValue quotientDefault = 0;
if (rhsDefault) {
quotientDefault = lhsDefault / rhsDefault;
}
for (iterator i = begin(); i != end(); ++i) {
if (i->first == DEFAULT_NAME) {
set(i->first, quotientDefault);
} else {
FValue lhsValue = i->second;
FValue rhsValue = rhs.get(i->first);
set(i->first, (lhsValue + lhsDefault) / (rhsValue + rhsDefault) - quotientDefault);
}
}
if (lhsDefault) {
//Features that have the default value in the lhs
for (const_iterator i = rhs.begin(); i != rhs.end(); ++i) {
if (!hasNonDefaultValue(i->first)) {
set(i->first, lhsDefault / (i->second + rhsDefault) - quotientDefault);
}
}
}
return *this;
}
FVector& FVector::max_equals(const FVector& rhs) {
FValue lhsDefault = get(DEFAULT_NAME);
FValue rhsDefault = rhs.get(DEFAULT_NAME);
FValue maxDefault = max(lhsDefault,rhsDefault);
for (iterator i = begin(); i != end(); ++i) {
if (i->first == DEFAULT_NAME) {
set(i->first, maxDefault);
} else {
set(i->first, max(i->second + lhsDefault, rhs.get(i->first) + rhsDefault) - maxDefault);
}
}
for (const_iterator i = rhs.begin(); i != rhs.end(); ++i) {
if (!hasNonDefaultValue(i->first)) {
set(i->first, max(lhsDefault, (i->second + rhsDefault)) - maxDefault);
}
}
return *this;
}
FVector& FVector::operator+= (const FValue& rhs) {
set(DEFAULT_NAME, get(DEFAULT_NAME) + rhs);
return *this;
}
FVector& FVector::operator-= (const FValue& rhs) {
set(DEFAULT_NAME, get(DEFAULT_NAME) - rhs);
return *this;
}
FVector& FVector::operator*= (const FValue& rhs) {
//NB Could do this with boost::bind ?
//This multiplies the default value, which is what we want
for (iterator i = begin(); i != end(); ++i) {
i->second *= rhs;
}
return *this;
}
FVector& FVector::operator/= (const FValue& rhs) {
//This dividess the default value, which is what we want
for (iterator i = begin(); i != end(); ++i) {
i->second /= rhs;
}
return *this;
}
FValue FVector::l1norm() const {
FValue norm = 0;
for (const_iterator i = begin(); i != end(); ++i) {
if (!(i->second) && i->first == DEFAULT_NAME) {
throw runtime_error("Cannot take l1norm with non-zero default values");
}
norm += abs(i->second);
}
return norm;
}
FValue FVector::sum() const {
FValue sum = 0;
for (const_iterator i = begin(); i != end(); ++i) {
if (!(i->second) && i->first == DEFAULT_NAME) {
throw runtime_error("Cannot take sum with non-zero default values");
}
sum += i->second;
}
return sum;
}
FValue FVector::l2norm() const {
return sqrt(inner_product(*this));
}
FValue FVector::inner_product(const FVector& rhs) const {
FValue lhsDefault = get(DEFAULT_NAME);
FValue rhsDefault = rhs.get(DEFAULT_NAME);
if (lhsDefault && rhsDefault) {
throw runtime_error("Cannot take inner product if both lhs and rhs have non-zero default values");
}
FValue product = 0.0;
for (const_iterator i = begin(); i != end(); ++i) {
if (i->first != DEFAULT_NAME) {
product += ((i->second + lhsDefault)*(rhs.get(i->first) + rhsDefault));
}
}
if (lhsDefault) {
//Features that have the default value in the rhs
for (const_iterator i = rhs.begin(); i != rhs.end(); ++i) {
if (!hasNonDefaultValue(i->first)) {
product += (i->second + rhsDefault)*lhsDefault;
}
}
}
return product;
}
const FVector operator+(const FVector& lhs, const FVector& rhs) {
return FVector(lhs) += rhs;
}
const FVector operator-(const FVector& lhs, const FVector& rhs) {
return FVector(lhs) -= rhs;
}
const FVector operator*(const FVector& lhs, const FVector& rhs) {
return FVector(lhs) *= rhs;
}
const FVector operator/(const FVector& lhs, const FVector& rhs) {
return FVector(lhs) /= rhs;
}
const FVector operator+(const FVector& lhs, const FValue& rhs) {
return FVector(lhs) += rhs;
}
const FVector operator-(const FVector& lhs, const FValue& rhs) {
return FVector(lhs) -= rhs;
}
const FVector operator*(const FVector& lhs, const FValue& rhs) {
return FVector(lhs) *= rhs;
}
const FVector operator/(const FVector& lhs, const FValue& rhs) {
return FVector(lhs) /= rhs;
}
const FVector fvmax(const FVector& lhs, const FVector& rhs) {
return FVector(lhs).max_equals(rhs);
}
FValue inner_product(const FVector& lhs, const FVector& rhs) {
if (lhs.size() >= rhs.size()) {
return rhs.inner_product(lhs);
} else {
return lhs.inner_product(rhs);
}
}
}

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moses/src/FeatureVector.h Normal file
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/*
Moses - factored phrase-based language decoder
Copyright (C) 2010 University of Edinburgh
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef FEATUREVECTOR_H
#define FEATUREVECTOR_H
#include <iostream>
#include <map>
#include <sstream>
#include <string>
#include <vector>
#include <boost/functional/hash.hpp>
#include <boost/unordered_map.hpp>
#ifdef MPI_ENABLED
#include <boost/serialization/access.hpp>
#include <boost/serialization/split_member.hpp>
#include <boost/serialization/string.hpp>
#include <boost/serialization/vector.hpp>
#endif
namespace Moses {
typedef float FValue;
/**
* Feature name
**/
struct FName {
static const std::string SEP;
typedef boost::unordered_map<std::string,size_t> Name2Id;
//typedef std::map<std::string, size_t> Name2Id;
static Name2Id name2id;
static std::vector<std::string> id2name;
//A feature name can either be initialised as a pair of strings,
//which will be concatenated with a SEP between them, or as
//a single string, which will be used as-is.
FName(const std::string root, const std::string name)
{init(root + SEP + name);}
FName(const std::string& name)
{init(name);}
const std::string& name() const;
//const std::string& root() const {return m_root;}
size_t hash() const;
bool operator==(const FName& rhs) const ;
bool operator!=(const FName& rhs) const ;
private:
void init(const std::string& name);
size_t m_id;
};
std::ostream& operator<<(std::ostream& out,const FName& name);
struct FNameEquals {
inline bool operator() (const FName& lhs, const FName& rhs) const {
return (lhs == rhs);
}
};
struct FNameHash
: std::unary_function<FName, std::size_t>
{
std::size_t operator()(const FName& x) const
{
return x.hash();
}
};
class ProxyFVector;
/**
* A sparse feature (or weight) vector.
**/
class FVector
{
public:
/** Empty feature vector, possibly with default value */
FVector(FValue defaultValue = DEFAULT);
//defaults
static FName DEFAULT_NAME;
static const FValue DEFAULT;
void clear();
bool hasNonDefaultValue(FName name) const { return m_features.find(name) != m_features.end();}
/** Load from file - each line should be 'root[_name] value' */
void load(const std::string& filename);
void save(const std::string& filename) const;
void write(std::ostream& out) const ;
/** Element access */
ProxyFVector operator[](const FName& name);
FValue operator[](const FName& name) const;
/** Size */
size_t size() const {return m_features.size();}
/** Equality */
bool operator== (const FVector& rhs) const;
bool operator!= (const FVector& rhs) const;
friend class ProxyFVector;
/**arithmetic */
//Element-wise
FVector& operator+= (const FVector& rhs);
FVector& operator-= (const FVector& rhs);
FVector& operator*= (const FVector& rhs);
FVector& operator/= (const FVector& rhs);
//Scalar
FVector& operator+= (const FValue& rhs);
FVector& operator-= (const FValue& rhs);
FVector& operator*= (const FValue& rhs);
FVector& operator/= (const FValue& rhs);
FValue inner_product(const FVector& rhs) const;
FVector& max_equals(const FVector& rhs);
/** norms and sums */
FValue l1norm() const;
FValue l2norm() const;
FValue sum() const;
/** printing */
std::ostream& print(std::ostream& out) const;
#ifdef MPI_ENABLED
friend class boost::serialization::access;
#endif
private:
typedef boost::unordered_map<FName,FValue,FNameHash, FNameEquals> FNVmap;
/** Internal get and set. Note that the get() doesn't include the
default value */
const FValue& get(const FName& name) const;
void set(const FName& name, const FValue& value);
/** Iterators */
typedef FNVmap::iterator iterator;
typedef FNVmap::const_iterator const_iterator;
iterator begin() {return m_features.begin();}
iterator end() {return m_features.end();}
const_iterator begin() const {return m_features.begin();}
const_iterator end() const {return m_features.end();}
FNVmap m_features;
#ifdef MPI_ENABLED
//serialization
template<class Archive>
void save(Archive &ar, const unsigned int version) const {
std::vector<std::string> names;
std::vector<FValue> values;
for (const_iterator i = begin(); i != end(); ++i) {
std::ostringstream ostr;
ostr << i->first;
names.push_back(ostr.str());
values.push_back(i->second);
}
ar << names;
ar << values;
}
template<class Archive>
void load(Archive &ar, const unsigned int version) {
clear();
std::vector<std::string> names;
std::vector<FValue> values;
ar >> names;
ar >> values;
assert (names.size() == values.size());
for (size_t i = 0; i < names.size(); ++i) {
set(FName(names[i]), values[i]);
}
}
BOOST_SERIALIZATION_SPLIT_MEMBER()
#endif
};
std::ostream& operator<<( std::ostream& out, const FVector& fv);
//Element-wise operations
const FVector operator+(const FVector& lhs, const FVector& rhs);
const FVector operator-(const FVector& lhs, const FVector& rhs);
const FVector operator*(const FVector& lhs, const FVector& rhs);
const FVector operator/(const FVector& lhs, const FVector& rhs);
//Scalar operations
const FVector operator+(const FVector& lhs, const FValue& rhs);
const FVector operator-(const FVector& lhs, const FValue& rhs);
const FVector operator*(const FVector& lhs, const FValue& rhs);
const FVector operator/(const FVector& lhs, const FValue& rhs);
const FVector fvmax(const FVector& lhs, const FVector& rhs);
FValue inner_product(const FVector& lhs, const FVector& rhs);
struct FVectorPlus {
FVector operator()(const FVector& lhs, const FVector& rhs) const {
return lhs + rhs;
}
};
/**
* Used to help with subscript operator overloading.
* See http://stackoverflow.com/questions/1386075/overloading-operator-for-a-sparse-vector
**/
class ProxyFVector {
public:
ProxyFVector(FVector *fv, const FName& name ) : m_fv(fv), m_name(name) {}
ProxyFVector &operator=(const FValue& value) {
// If we get here, we know that operator[] was called to perform a write access,
// so we can insert an item in the vector if needed
//std::cerr << "Inserting " << value << " into " << m_name << std::endl;
m_fv->set(m_name,value-m_fv->get(FVector::DEFAULT_NAME));
return *this;
}
operator FValue() {
// If we get here, we know that operator[] was called to perform a read access,
// so we can simply return the value from the vector
return m_fv->get(m_name) + m_fv->get(FVector::DEFAULT_NAME);
}
/*operator FValue&() {
return m_fv->m_features[m_name];
}*/
FValue operator++() {
return ++m_fv->m_features[m_name] + m_fv->get(FVector::DEFAULT_NAME);
}
FValue operator +=(FValue lhs) {
return (m_fv->m_features[m_name] += lhs) + m_fv->get(FVector::DEFAULT_NAME);
}
private:
FValue m_tmp;
private:
FVector* m_fv;
const FName& m_name;
};
}
#endif