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#pragma once
#include <iostream>
#include <sstream>
#include <string>
#include <unordered_map>
#include <vector>
#include "util.hh"
#include "weaver.hh"
using namespace std;
namespace Sv {
template<typename K, typename V>
struct SparseVector {
unordered_map<K,V> m_;
V zero = 0.f;
SparseVector() {};
SparseVector(string& s)
{
from_s(this, s);
};
void
insert(K k, V v) { m_[k] = v; };
V
dot(SparseVector& other)
{
V r;
unordered_map<K,V>* o = &m_;
auto b = m_.cbegin();
auto e = m_.cend();
if (other.size() < size()) {
b = other.m_.cbegin();
e = other.m_.cend();
o = &other.m_;
}
for (auto it = b; it != e; it++)
r += it->second * o->at(it->first);
return r;
};
size_t
size()
{
return m_.size();
}
V&
operator[](const K& k)
{
return at(k);
};
const V&
at(const K& k) const
{
if (m_.find(k) == m_.end())
return zero;
else
return m_.at(k);
}
SparseVector
operator+(const SparseVector& other) const
{
SparseVector<K,V> v;
v.m_.insert(m_.cbegin(), m_.cend());
v.m_.insert(other.m_.cbegin(), other.m_.cend());
for (const auto it: v.m_)
v.m_[it.first] = this->at(it.first) + other.at(it.first);
return v;
};
SparseVector&
operator+=(const SparseVector& other)
{
for (const auto it: other.m_)
m_[it.first] += it.second;
return *this;
};
SparseVector
operator-(const SparseVector& other) const
{
SparseVector<K,V> v;
v.m_.insert(m_.cbegin(), m_.cend());
v.m_.insert(other.m_.cbegin(), other.m_.cend());
for (const auto it: v.m_)
v.m_[it.first] = this->at(it.first) - other.at(it.first);
return v;
};
SparseVector&
operator-=(const SparseVector& other)
{
for (const auto it: other.m_)
m_[it.first] -= it.second;
return *this;
};
SparseVector
operator*(V f) const
{
SparseVector<K,V> v;
for (const auto it: m_)
v.m_[it.first] = this->at(it.first) * f;
return v;
};
SparseVector&
operator*=(V f)
{
for (const auto it: m_)
m_[it.first] *= f;
return *this;
};
static void
from_s(SparseVector* w, const string& s)
{
stringstream ss(s);
while (!ss.eof()) {
string t;
ss >> t;
size_t eq = t.find_first_of("=");
if (eq == string::npos) {
return;
}
t.replace(eq, 1, " ");
stringstream tt(t);
K k; V v;
tt >> k >> v;
w->m_.emplace(k.substr(k.find_first_of("\"")+1, k.find_last_of("\"")-1), v);
}
}
ostream&
repr(ostream& os) const
{
os << "SparseVector<{";
for (auto it = m_.cbegin(); it != m_.cend(); it++) {
os << "'" << it->first << "'=" << it->second;
if (next(it) != m_.end())
os << ", ";
}
os << "}>";
return os;
};
ostream&
escaped(ostream& os, bool quote_keys=false) const {
for (auto it = m_.cbegin(); it != m_.cend(); it++) {
if (quote_keys) os << '"';
os << util::json_escape(it->first);
if (quote_keys) os << '"';
os << "=" << it->second;
if (next(it) != m_.cend()) os << " ";
}
return os;
};
friend ostream&
operator<<(ostream& os, const SparseVector& v)
{
return v.repr(os);
}
};
} // namespace
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