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#ifndef _FF_WORDSET_H_
#define _FF_WORDSET_H_
#include "ff.h"
#include <tr1/unordered_set>
#include <boost/algorithm/string.hpp>
#include <vector>
#include <string>
#include <iostream>
#include <fstream>
class WordSet : public FeatureFunction {
public:
// we depend on the order of the initializer list
// to call member constructurs in the proper order
// modify this carefully!
//
// Usage: "WordSet -v vocab.txt [--oov]"
WordSet(const std::string& param) {
std::string vocabFile;
std::string featName;
parseArgs(param, &featName, &vocabFile, &oovMode_);
fid_ = FD::Convert(featName);
std::cerr << "Loading vocab for " << param << " from " << vocabFile << std::endl;
loadVocab(vocabFile, &vocab_);
}
~WordSet() {
}
Features features() const { return single_feature(fid_); }
protected:
virtual void TraversalFeaturesImpl(const SentenceMetadata& smeta,
const Hypergraph::Edge& edge,
const std::vector<const void*>& ant_contexts,
SparseVector<double>* features,
SparseVector<double>* estimated_features,
void* context) const;
private:
static void loadVocab(const std::string& vocabFile, std::tr1::unordered_set<WordID>* vocab) {
std::ifstream file;
std::string line;
file.open(vocabFile.c_str(), std::fstream::in);
if (file.is_open()) {
unsigned lineNum = 0;
while (!file.eof()) {
++lineNum;
getline(file, line);
boost::trim(line);
if(line.empty()) {
continue;
}
WordID vocabId = TD::Convert(line);
vocab->insert(vocabId);
}
file.close();
} else {
std::cerr << "Unable to open file: " << vocabFile;
exit(1);
}
}
static void parseArgs(const std::string& args, std::string* featName, std::string* vocabFile, bool* oovMode) {
std::vector<std::string> toks(10);
boost::split(toks, args, boost::is_any_of(" "));
*oovMode = false;
// skip initial feature name
for(std::vector<std::string>::const_iterator it = toks.begin(); it != toks.end(); ++it) {
if(*it == "-v") {
*vocabFile = *++it; // copy
} else if(*it == "-N") {
*featName = *++it;
} else if(*it == "--oov") {
*oovMode = true;
} else {
std::cerr << "Unrecognized argument: " << *it << std::endl;
exit(1);
}
}
if(*featName == "") {
std::cerr << "featName (-N) not specified for WordSet" << std::endl;
exit(1);
}
if(*vocabFile == "") {
std::cerr << "vocabFile (-v) not specified for WordSet" << std::endl;
exit(1);
}
}
int fid_;
bool oovMode_;
std::tr1::unordered_set<WordID> vocab_;
};
#endif
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