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-rw-r--r--utils/fast_sparse_vector.h191
-rwxr-xr-xutils/feature_vector.h1
-rw-r--r--utils/sparse_vector.cc3
-rw-r--r--utils/sparse_vector.h9
-rw-r--r--utils/ts.cc41
5 files changed, 216 insertions, 29 deletions
diff --git a/utils/fast_sparse_vector.h b/utils/fast_sparse_vector.h
index 91bf441d..c4a44b99 100644
--- a/utils/fast_sparse_vector.h
+++ b/utils/fast_sparse_vector.h
@@ -1,47 +1,102 @@
#ifndef _FAST_SPARSE_VECTOR_H_
#define _FAST_SPARSE_VECTOR_H_
+// FastSparseVector<T> is a integer indexed unordered map that supports very fast
+// (mathematical) vector operations when the sizes are very small, and reasonably
+// fast operations when the sizes are large.
+// important: indexes are integers
+// important: iterators may return elements in any order
+
+#include <cstring>
+#include <climits>
#include <map>
#include <cassert>
+#include <vector>
#include <boost/static_assert.hpp>
-// these are architecture dependent, they should be
+// this is architecture dependent, it should be
// detected in some way but it's probably easiest (for me)
-// to just set them
+// to just set it
#define L2_CACHE_LINE 128
-// this should just be a typedef to pair<int,float> on the new c++
+// this should just be a typedef to pair<int,T> on the new c++
template <typename T>
-struct PairIntFloat {
+struct PairIntT {
int first;
T second;
- const PairIntFloat& operator=(const std::pair<const int, float>& v) {
+ const PairIntT& operator=(const std::pair<const int, T>& v) {
first = v.first;
second = v.second;
return *this;
}
- operator const std::pair<const int, float>&() const {
- return *reinterpret_cast<const std::pair<const int, float>*>(this);
+ operator const std::pair<const int, T>&() const {
+ return *reinterpret_cast<const std::pair<const int, T>*>(this);
}
};
-BOOST_STATIC_ASSERT(sizeof(PairIntFloat<float>) == sizeof(std::pair<int,float>));
+BOOST_STATIC_ASSERT(sizeof(PairIntT<float>) == sizeof(std::pair<int,float>));
template <typename T, int LOCAL_MAX = (sizeof(T) == sizeof(float) ? 15 : 7)>
class FastSparseVector {
public:
+ struct const_iterator {
+ const_iterator(const FastSparseVector<T>& v, const bool is_end) : local_(v.is_local_) {
+ if (local_) {
+ local_it_ = &v.data_.local[is_end ? v.local_size_ : 0];
+ } else {
+ if (is_end)
+ remote_it_ = v.data_.rbmap->end();
+ else
+ remote_it_ = v.data_.rbmap->begin();
+ }
+ }
+ const bool local_;
+ const PairIntT<T>* local_it_;
+ typename std::map<int, T>::const_iterator remote_it_;
+ const std::pair<const int, T>& operator*() const {
+ if (local_)
+ return *reinterpret_cast<const std::pair<const int, float>*>(local_it_);
+ else
+ return *remote_it_;
+ }
+
+ const std::pair<const int, T>* operator->() const {
+ if (local_)
+ return reinterpret_cast<const std::pair<const int, T>*>(local_it_);
+ else
+ return &*remote_it_;
+ }
+
+ const_iterator& operator++() {
+ if (local_) ++local_it_; else ++remote_it_;
+ return *this;
+ }
+
+ inline bool operator==(const const_iterator& o) const {
+ if (o.local_ != local_) return false;
+ if (local_) {
+ return local_it_ == o.local_it_;
+ } else {
+ return remote_it_ == o.remote_it_;
+ }
+ }
+ inline bool operator!=(const const_iterator& o) const {
+ return !(o == *this);
+ }
+ };
+ public:
FastSparseVector() : local_size_(0), is_local_(true) {}
~FastSparseVector() {
if (!is_local_) delete data_.rbmap;
}
FastSparseVector(const FastSparseVector& other) {
- memcpy(this, &other, sizeof(FastSparseVector));
+ std::memcpy(this, &other, sizeof(FastSparseVector));
if (is_local_) return;
data_.rbmap = new std::map<int, T>(*data_.rbmap);
}
const FastSparseVector& operator=(const FastSparseVector& other) {
if (!is_local_) delete data_.rbmap;
- memcpy(this, &other, sizeof(FastSparseVector));
+ std::memcpy(this, &other, sizeof(FastSparseVector));
if (is_local_) return *this;
data_.rbmap = new std::map<int, T>(*data_.rbmap);
return *this;
@@ -52,11 +107,11 @@ class FastSparseVector {
inline T value(int k) const {
if (is_local_) {
for (int i = 0; i < local_size_; ++i) {
- const PairIntFloat<T>& p = data_.local[i];
+ const PairIntT<T>& p = data_.local[i];
if (p.first == k) return p.second;
}
} else {
- std::map<int, float>::const_iterator it = data_.rbmap->find(k);
+ typename std::map<int, T>::const_iterator it = data_.rbmap->find(k);
if (it != data_.rbmap->end()) return it->second;
}
return T();
@@ -73,13 +128,67 @@ class FastSparseVector {
return size() == 0;
}
inline FastSparseVector& operator+=(const FastSparseVector& other) {
- if (!is_local_) {
- } else if (!other.is_local_) {
- } else { // both local
+ if (empty()) { *this = other; return *this; }
+ const typename FastSparseVector::const_iterator end = other.end();
+ for (typename FastSparseVector::const_iterator it = other.begin(); it != end; ++it) {
+ get_or_create_bin(it->first) += it->second;
+ }
+ return *this;
+ }
+ inline FastSparseVector& operator-=(const FastSparseVector& other) {
+ const typename FastSparseVector::const_iterator end = other.end();
+ for (typename FastSparseVector::const_iterator it = other.begin(); it != end; ++it) {
+ get_or_create_bin(it->first) -= it->second;
}
return *this;
}
+ inline FastSparseVector& operator*=(const T& scalar) {
+ if (is_local_) {
+ for (int i = 0; i < local_size_; ++i)
+ data_.local[i].second *= scalar;
+ } else {
+ const typename std::map<int, T>::iterator end = data_.rbmap->end();
+ for (typename std::map<int, T>::iterator it = data_.rbmap->begin(); it != end; ++it)
+ it->second *= scalar;
+ }
+ return *this;
+ }
+ inline FastSparseVector& operator/=(const T& scalar) {
+ if (is_local_) {
+ for (int i = 0; i < local_size_; ++i)
+ data_.local[i].second /= scalar;
+ } else {
+ const typename std::map<int, T>::iterator end = data_.rbmap->end();
+ for (typename std::map<int, T>::iterator it = data_.rbmap->begin(); it != end; ++it)
+ it->second /= scalar;
+ }
+ return *this;
+ }
+ const_iterator begin() const {
+ return const_iterator(*this, false);
+ }
+ const_iterator end() const {
+ return const_iterator(*this, true);
+ }
+ void init_vector(std::vector<T> *vp) const {
+ init_vector(*vp);
+ }
+ void init_vector(std::vector<T> &v) const {
+ v.clear();
+ for (const_iterator i=begin(),e=end();i!=e;++i)
+ extend_vector(v,i->first)=i->second;
+ }
+ T dot(const std::vector<T>& v) const {
+ T res = T();
+ for (const_iterator it = begin(), e = end(); it != e; ++it)
+ if (it->first < v.size()) res += it->second * v[it->first];
+ }
private:
+ inline T& extend_vector(std::vector<T> &v,int i) {
+ if (i>=v.size())
+ v.resize(i+1);
+ return v[i];
+ }
inline T& get_or_create_bin(int k) {
if (is_local_) {
for (int i = 0; i < local_size_; ++i)
@@ -90,7 +199,7 @@ class FastSparseVector {
assert(is_local_);
// currently local!
if (local_size_ < LOCAL_MAX) {
- PairIntFloat<T>& p = data_.local[local_size_];
+ PairIntT<T>& p = data_.local[local_size_];
++local_size_;
p.first = k;
return p.second;
@@ -119,17 +228,65 @@ class FastSparseVector {
}
union {
- PairIntFloat<T> local[LOCAL_MAX];
+ PairIntT<T> local[LOCAL_MAX];
std::map<int, T>* rbmap;
} data_;
unsigned char local_size_;
bool is_local_;
};
+template <typename T>
+const FastSparseVector<T> operator+(const FastSparseVector<T>& x, const FastSparseVector<T>& y) {
+ if (x.size() > y.size()) {
+ FastSparseVector<T> res(x);
+ res += y;
+ return res;
+ } else {
+ FastSparseVector<T> res(y);
+ res += x;
+ return res;
+ }
+}
+
+template <typename T>
+const FastSparseVector<T> operator-(const FastSparseVector<T>& x, const FastSparseVector<T>& y) {
+ if (x.size() > y.size()) {
+ FastSparseVector<T> res(x);
+ res -= y;
+ return res;
+ } else {
+ FastSparseVector<T> res(y);
+ res -= x;
+ return res;
+ }
+}
+
namespace performance_checks {
// if you get a failure on the next line, you should adjust LOCAL_MAX for
// your architecture
BOOST_STATIC_ASSERT(sizeof(FastSparseVector<float>) == L2_CACHE_LINE);
};
+#include "fdict.h"
+
+template <class O, typename T>
+inline void print(O &o,const FastSparseVector<T>& v, const char* kvsep="=",const char* pairsep=" ",const char* pre="",const char* post="") {
+ o << pre;
+ bool first=true;
+ for (typename FastSparseVector<T>::const_iterator i=v.begin(),e=v.end();i!=e;++i) {
+ if (first)
+ first=false;
+ else
+ o<<pairsep;
+ o<<FD::Convert(i->first)<<kvsep<<i->second;
+ }
+ o << post;
+}
+
+template <typename T>
+inline std::ostream& operator<<(std::ostream& out, const FastSparseVector<T>& v) {
+ print(out, v);
+ return out;
+}
+
#endif
diff --git a/utils/feature_vector.h b/utils/feature_vector.h
index be378a6a..733aa99e 100755
--- a/utils/feature_vector.h
+++ b/utils/feature_vector.h
@@ -6,7 +6,6 @@
#include "fdict.h"
typedef double Featval;
-typedef SparseVectorList<Featval> FeatureVectorList;
typedef SparseVector<Featval> FeatureVector;
typedef SparseVector<Featval> WeightVector;
typedef std::vector<Featval> DenseWeightVector;
diff --git a/utils/sparse_vector.cc b/utils/sparse_vector.cc
index 6e42a216..24da5f39 100644
--- a/utils/sparse_vector.cc
+++ b/utils/sparse_vector.cc
@@ -3,6 +3,7 @@
#include <iostream>
#include <cstring>
+#include "fdict.h"
#include "b64tools.h"
using namespace std;
@@ -10,7 +11,7 @@ using namespace std;
namespace B64 {
void Encode(double objective, const SparseVector<double>& v, ostream* out) {
- const int num_feats = v.num_active();
+ const int num_feats = v.size();
size_t tot_size = 0;
const size_t off_objective = tot_size;
tot_size += sizeof(double); // objective
diff --git a/utils/sparse_vector.h b/utils/sparse_vector.h
index 1bcb9502..de8c0291 100644
--- a/utils/sparse_vector.h
+++ b/utils/sparse_vector.h
@@ -1,6 +1,8 @@
#ifndef _SPARSE_VECTOR_H_
#define _SPARSE_VECTOR_H_
+#undef USE_FAST_SPARSE_VECTOR
+#ifndef USE_FAST_SPARSE_VECTOR
/*
TODO: specialize for int value types, where it probably makes sense to check if adding/subtracting brings a value to 0, and remove it from the map (e.g. in a gibbs sampler). or add a separate policy argument for that.
*/
@@ -667,6 +669,13 @@ std::ostream &operator<<(std::ostream &out, const SparseVector<T> &vec)
return vec.operator<<(out);
}
+#else
+
+#include "fast_sparse_vector.h"
+#define SparseVector FastSparseVector
+
+#endif
+
namespace B64 {
void Encode(double objective, const SparseVector<double>& v, std::ostream* out);
// returns false if failed to decode
diff --git a/utils/ts.cc b/utils/ts.cc
index 1febed3c..28b5f9b1 100644
--- a/utils/ts.cc
+++ b/utils/ts.cc
@@ -10,25 +10,46 @@
using namespace std;
+template <typename T>
+void Print(const T& x) {
+ typename T::const_iterator it = x.begin();
+ for (; it != x.end(); ++it) {
+ cerr << it->first << ":" << it->second << " ";
+ }
+ cerr << endl;
+}
+
+template <typename T>
+void test_unique() {
+ T x;
+ x.set_value(100, 1.0);
+ x.set_value(100, 2.0);
+ Print(x);
+ assert(x.size() == 1);
+ assert(x.value(100) == 2.0);
+}
+
int main() {
cerr << sizeof(prob_t) << " " << sizeof(LogVal<float>) << endl;
cerr << " sizeof(FSV<float>) = " << sizeof(FastSparseVector<float>) << endl;
cerr << "sizeof(FSV<double>) = " << sizeof(FastSparseVector<double>) << endl;
- sranddev();
+ test_unique<FastSparseVector<float> >();
+// sranddev();
int c = 0;
+ FastSparseVector<float> p;
for (int i = 0; i < 1000000; ++i) {
FastSparseVector<float> x;
- //SparseVector<float> x;
- for (int j = 0; j < 15; ++j) {
- const int k = rand() % 1000;
- const float v = rand() / 3.14f;
+ for (int j = 0; j < 10; ++j) {
+ const int k = rand() % 200;
+ const float v = 1000.0f / rand();
x.set_value(k,v);
}
- //SparseVector<float> y = x;
- FastSparseVector<float> y = x;
- y += x;
- y = x;
- if (y.value(50)) { c++; }
+ if (x.value(50)) { c++; }
+ p = x;
+ p += p;
+ FastSparseVector<float> y = p + p;
+ y *= 2;
+ y -= y;
}
cerr << "Counted " << c << " times\n";
return 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 14:42:02 +0000