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-rw-r--r--decoder/decoder.cc22
1 files changed, 21 insertions, 1 deletions
diff --git a/decoder/decoder.cc b/decoder/decoder.cc
index 95ff6270..8a03c5c9 100644
--- a/decoder/decoder.cc
+++ b/decoder/decoder.cc
@@ -141,12 +141,13 @@ inline shared_ptr<FsaFeatureFunction> make_fsa_ff(string const& ffp,bool verbose
// and then prune the resulting (rescored) hypergraph. All feature values from previous
// passes are carried over into subsequent passes (where they may have different weights).
struct RescoringPass {
- RescoringPass() : density_prune(), beam_prune() {}
+ RescoringPass() : fid_summary(), density_prune(), beam_prune() {}
shared_ptr<ModelSet> models;
shared_ptr<IntersectionConfiguration> inter_conf;
vector<const FeatureFunction*> ffs;
shared_ptr<Weights> w; // null == use previous weights
vector<double> weight_vector;
+ int fid_summary; // 0 == no summary feature
double density_prune; // 0 == don't density prune
double beam_prune; // 0 == don't beam prune
};
@@ -155,6 +156,7 @@ ostream& operator<<(ostream& os, const RescoringPass& rp) {
os << "[num_fn=" << rp.ffs.size();
if (rp.inter_conf) { os << " int_alg=" << *rp.inter_conf; }
if (rp.w) os << " new_weights";
+ if (rp.fid_summary) os << " summary_feature=" << FD::Convert(rp.fid_summary);
if (rp.density_prune) os << " density_prune=" << rp.density_prune;
if (rp.beam_prune) os << " beam_prune=" << rp.beam_prune;
os << ']';
@@ -361,18 +363,21 @@ DecoderImpl::DecoderImpl(po::variables_map& conf, int argc, char** argv, istream
("weights,w",po::value<string>(),"Feature weights file (initial forest / pass 1)")
("feature_function,F",po::value<vector<string> >()->composing(), "Pass 1 additional feature function(s) (-L for list)")
("intersection_strategy,I",po::value<string>()->default_value("cube_pruning"), "Pass 1 intersection strategy for incorporating finite-state features; values include Cube_pruning, Full")
+ ("summary_feature", po::value<string>(), "Compute a 'summary feature' at the end of the pass (before any pruning) with name=arg and value=inside-outside/Z")
("density_prune", po::value<double>(), "Pass 1 pruning: keep no more than this many times the number of edges used in the best derivation tree (>=1.0)")
("beam_prune", po::value<double>(), "Pass 1 pruning: Prune paths from scored forest, keep paths within exp(alpha>=0)")
("weights2",po::value<string>(),"Optional pass 2")
("feature_function2",po::value<vector<string> >()->composing(), "Optional pass 2")
("intersection_strategy2",po::value<string>()->default_value("cube_pruning"), "Optional pass 2")
+ ("summary_feature2", po::value<string>(), "Optional pass 2")
("density_prune2", po::value<double>(), "Optional pass 2")
("beam_prune2", po::value<double>(), "Optional pass 2")
("weights3",po::value<string>(),"Optional pass 3")
("feature_function3",po::value<vector<string> >()->composing(), "Optional pass 3")
("intersection_strategy3",po::value<string>()->default_value("cube_pruning"), "Optional pass 3")
+ ("summary_feature3", po::value<string>(), "Optional pass 3")
("density_prune3", po::value<double>(), "Optional pass 3")
("beam_prune3", po::value<double>(), "Optional pass 3")
@@ -559,6 +564,7 @@ DecoderImpl::DecoderImpl(po::variables_map& conf, int argc, char** argv, istream
for (int pass = 0; pass < MAX_PASSES; ++pass) {
string ws = "weights" + StringSuffixForRescoringPass(pass);
string ff = "feature_function" + StringSuffixForRescoringPass(pass);
+ string sf = "summary_feature" + StringSuffixForRescoringPass(pass);
string bp = "beam_prune" + StringSuffixForRescoringPass(pass);
string dp = "density_prune" + StringSuffixForRescoringPass(pass);
bool first_pass_condition = ((pass == 0) && (conf.count(ff) || conf.count(bp) || conf.count(dp)));
@@ -583,6 +589,11 @@ DecoderImpl::DecoderImpl(po::variables_map& conf, int argc, char** argv, istream
if (p->IsStateful()) { has_stateful = true; }
}
}
+ if (conf.count(sf)) {
+ rp.fid_summary = FD::Convert(conf[sf].as<string>());
+ assert(rp.fid_summary > 0);
+ // TODO assert that weights for this pass have coef(fid_summary) == 0.0?
+ }
if (conf.count(bp)) { rp.beam_prune = conf[bp].as<double>(); }
if (conf.count(dp)) { rp.density_prune = conf[dp].as<double>(); }
int palg = (has_stateful ? 1 : 0); // if there are no stateful featueres, default to FULL
@@ -794,6 +805,15 @@ bool DecoderImpl::Decode(const string& input, DecoderObserver* o) {
cerr << " " << passtr << " partition log(Z): " << log(z) << endl;
}
+ if (rp.fid_summary) {
+ Hypergraph::EdgeProbs posteriors;
+ const prob_t z = forest.ComputeEdgePosteriors(1.0, &posteriors);
+ if (!SILENT) { cerr << " " << passtr << " adding summary feature " << FD::Convert(rp.fid_summary) << " log(Z)=" << log(z) << endl; }
+ assert(forest.edges_.size() == posteriors.size());
+ for (int i = 0; i < posteriors.size(); ++i)
+ forest.edges_[i].feature_values_.set_value(rp.fid_summary, log(posteriors[i] / z));
+ }
+
string fullbp = "beam_prune" + StringSuffixForRescoringPass(pass);
string fulldp = "density_prune" + StringSuffixForRescoringPass(pass);
maybe_prune(forest,conf,fullbp.c_str(),fulldp.c_str(),passtr,srclen);