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#include <iostream>
#include <vector>
#include <cassert>
#include <cmath>
#include <boost/program_options.hpp>
#include <boost/program_options/variables_map.hpp>
#include "filelib.h"
#include "fdict.h"
#include "weights.h"
#include "sparse_vector.h"
#include "em_utils.h"
using namespace std;
namespace po = boost::program_options;
void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
po::options_description opts("Configuration options");
opts.add_options()
("optimization_method,m", po::value<string>()->default_value("em"), "Optimization method (em, vb)")
("input_format,f",po::value<string>()->default_value("b64"),"Encoding of the input (b64 or text)");
po::options_description clo("Command line options");
clo.add_options()
("config", po::value<string>(), "Configuration file")
("help,h", "Print this help message and exit");
po::options_description dconfig_options, dcmdline_options;
dconfig_options.add(opts);
dcmdline_options.add(opts).add(clo);
po::store(parse_command_line(argc, argv, dcmdline_options), *conf);
if (conf->count("config")) {
ifstream config((*conf)["config"].as<string>().c_str());
po::store(po::parse_config_file(config, dconfig_options), *conf);
}
po::notify(*conf);
if (conf->count("help")) {
cerr << dcmdline_options << endl;
exit(1);
}
}
double NoZero(const double& x) {
if (x) return x;
return 1e-35;
}
void Maximize(const bool use_vb,
const double& alpha,
const int total_event_types,
SparseVector<double>* pc) {
const SparseVector<double>& counts = *pc;
if (use_vb)
assert(total_event_types >= counts.size());
double tot = 0;
for (SparseVector<double>::const_iterator it = counts.begin();
it != counts.end(); ++it)
tot += it->second;
// cerr << " = " << tot << endl;
assert(tot > 0.0);
double ltot = log(tot);
if (use_vb)
ltot = digamma(tot + total_event_types * alpha);
for (SparseVector<double>::const_iterator it = counts.begin();
it != counts.end(); ++it) {
if (use_vb) {
pc->set_value(it->first, NoZero(digamma(it->second + alpha) - ltot));
} else {
pc->set_value(it->first, NoZero(log(it->second) - ltot));
}
}
#if 0
if (counts.size() < 50) {
for (SparseVector<double>::const_iterator it = counts.begin();
it != counts.end(); ++it) {
cerr << " p(" << FD::Convert(it->first) << ")=" << exp(it->second);
}
cerr << endl;
}
#endif
}
int main(int argc, char** argv) {
po::variables_map conf;
InitCommandLine(argc, argv, &conf);
const bool use_b64 = conf["input_format"].as<string>() == "b64";
const bool use_vb = conf["optimization_method"].as<string>() == "vb";
const double alpha = 1e-09;
if (use_vb)
cerr << "Using variational Bayes, make sure alphas are set\n";
const string s_obj = "**OBJ**";
// E-step
string cur_key = "";
SparseVector<double> acc;
double logprob = 0;
while(cin) {
string line;
getline(cin, line);
if (line.empty()) continue;
int feat;
double val;
size_t i = line.find("\t");
const string key = line.substr(0, i);
assert(i != string::npos);
++i;
if (key != cur_key) {
if (cur_key.size() > 0) {
// TODO shouldn't be num_active, should be total number
// of events
Maximize(use_vb, alpha, acc.size(), &acc);
cout << cur_key << '\t';
if (use_b64)
B64::Encode(0.0, acc, &cout);
else
cout << acc;
cout << endl;
acc.clear();
}
cur_key = key;
}
if (use_b64) {
SparseVector<double> g;
double obj;
if (!B64::Decode(&obj, &g, &line[i], line.size() - i)) {
cerr << "B64 decoder returned error, skipping!\n";
continue;
}
logprob += obj;
acc += g;
} else { // text encoding - your counts will not be accurate!
while (i < line.size()) {
size_t start = i;
while (line[i] != '=' && i < line.size()) ++i;
if (i == line.size()) { cerr << "FORMAT ERROR\n"; break; }
string fname = line.substr(start, i - start);
if (fname == s_obj) {
feat = -1;
} else {
feat = FD::Convert(line.substr(start, i - start));
}
++i;
start = i;
while (line[i] != ';' && i < line.size()) ++i;
if (i - start == 0) continue;
val = atof(line.substr(start, i - start).c_str());
++i;
if (feat == -1) {
logprob += val;
} else {
acc.add_value(feat, val);
}
}
}
}
// TODO shouldn't be num_active, should be total number
// of events
Maximize(use_vb, alpha, acc.size(), &acc);
cout << cur_key << '\t';
if (use_b64)
B64::Encode(0.0, acc, &cout);
else
cout << acc;
cout << endl << flush;
cerr << "LOGPROB: " << logprob << endl;
return 0;
}
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