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-rw-r--r--gi/pf/base_distributions.cc241
1 files changed, 241 insertions, 0 deletions
diff --git a/gi/pf/base_distributions.cc b/gi/pf/base_distributions.cc
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--- /dev/null
+++ b/gi/pf/base_distributions.cc
@@ -0,0 +1,241 @@
+#include "base_distributions.h"
+
+#include <iostream>
+
+#include "filelib.h"
+
+using namespace std;
+
+TableLookupBase::TableLookupBase(const string& fname) {
+ cerr << "TableLookupBase reading from " << fname << " ..." << endl;
+ ReadFile rf(fname);
+ istream& in = *rf.stream();
+ string line;
+ unsigned lc = 0;
+ const WordID kDIV = TD::Convert("|||");
+ vector<WordID> tmp;
+ vector<int> le, lf;
+ TRule x;
+ x.lhs_ = -TD::Convert("X");
+ bool flag = false;
+ while(getline(in, line)) {
+ ++lc;
+ if (lc % 1000000 == 0) { cerr << " [" << lc << ']' << endl; flag = false; }
+ else if (lc % 25000 == 0) { cerr << '.' << flush; flag = true; }
+ tmp.clear();
+ TD::ConvertSentence(line, &tmp);
+ x.f_.clear();
+ x.e_.clear();
+ size_t pos = 0;
+ int cc = 0;
+ while(pos < tmp.size()) {
+ const WordID cur = tmp[pos++];
+ if (cur == kDIV) {
+ ++cc;
+ } else if (cc == 0) {
+ x.f_.push_back(cur);
+ } else if (cc == 1) {
+ x.e_.push_back(cur);
+ } else if (cc == 2) {
+ table[x].logeq(atof(TD::Convert(cur)));
+ ++cc;
+ } else {
+ if (flag) cerr << endl;
+ cerr << "Bad format in " << lc << ": " << line << endl; abort();
+ }
+ }
+ if (cc != 3) {
+ if (flag) cerr << endl;
+ cerr << "Bad format in " << lc << ": " << line << endl; abort();
+ }
+ }
+ if (flag) cerr << endl;
+ cerr << " read " << lc << " entries\n";
+}
+
+prob_t PhraseConditionalUninformativeUnigramBase::p0(const vector<WordID>& vsrc,
+ const vector<WordID>& vtrg,
+ int start_src, int start_trg) const {
+ const int flen = vsrc.size() - start_src;
+ const int elen = vtrg.size() - start_trg;
+ prob_t p;
+ p.logeq(Md::log_poisson(elen, flen + 0.01)); // elen | flen ~Pois(flen + 0.01)
+ //p.logeq(log_poisson(elen, 1)); // elen | flen ~Pois(flen + 0.01)
+ for (int i = 0; i < elen; ++i)
+ p *= u(vtrg[i + start_trg]); // draw e_i ~Uniform
+ return p;
+}
+
+prob_t PhraseConditionalUninformativeBase::p0(const vector<WordID>& vsrc,
+ const vector<WordID>& vtrg,
+ int start_src, int start_trg) const {
+ const int flen = vsrc.size() - start_src;
+ const int elen = vtrg.size() - start_trg;
+ prob_t p;
+ //p.logeq(log_poisson(elen, flen + 0.01)); // elen | flen ~Pois(flen + 0.01)
+ p.logeq(Md::log_poisson(elen, 1)); // elen | flen ~Pois(flen + 0.01)
+ for (int i = 0; i < elen; ++i)
+ p *= kUNIFORM_TARGET; // draw e_i ~Uniform
+ return p;
+}
+
+void Model1::LoadModel1(const string& fname) {
+ cerr << "Loading Model 1 parameters from " << fname << " ..." << endl;
+ ReadFile rf(fname);
+ istream& in = *rf.stream();
+ string line;
+ unsigned lc = 0;
+ while(getline(in, line)) {
+ ++lc;
+ int cur = 0;
+ int start = 0;
+ while(cur < line.size() && line[cur] != ' ') { ++cur; }
+ assert(cur != line.size());
+ line[cur] = 0;
+ const WordID src = TD::Convert(&line[0]);
+ ++cur;
+ start = cur;
+ while(cur < line.size() && line[cur] != ' ') { ++cur; }
+ assert(cur != line.size());
+ line[cur] = 0;
+ WordID trg = TD::Convert(&line[start]);
+ const double logprob = strtod(&line[cur + 1], NULL);
+ if (src >= ttable.size()) ttable.resize(src + 1);
+ ttable[src][trg].logeq(logprob);
+ }
+ cerr << " read " << lc << " parameters.\n";
+}
+
+prob_t PhraseConditionalBase::p0(const vector<WordID>& vsrc,
+ const vector<WordID>& vtrg,
+ int start_src, int start_trg) const {
+ const int flen = vsrc.size() - start_src;
+ const int elen = vtrg.size() - start_trg;
+ prob_t uniform_src_alignment; uniform_src_alignment.logeq(-log(flen + 1));
+ prob_t p;
+ p.logeq(Md::log_poisson(elen, flen + 0.01)); // elen | flen ~Pois(flen + 0.01)
+ for (int i = 0; i < elen; ++i) { // for each position i in e-RHS
+ const WordID trg = vtrg[i + start_trg];
+ prob_t tp = prob_t::Zero();
+ for (int j = -1; j < flen; ++j) {
+ const WordID src = j < 0 ? 0 : vsrc[j + start_src];
+ tp += kM1MIXTURE * model1(src, trg);
+ tp += kUNIFORM_MIXTURE * kUNIFORM_TARGET;
+ }
+ tp *= uniform_src_alignment; // draw a_i ~uniform
+ p *= tp; // draw e_i ~Model1(f_a_i) / uniform
+ }
+ if (p.is_0()) {
+ cerr << "Zero! " << vsrc << "\nTRG=" << vtrg << endl;
+ abort();
+ }
+ return p;
+}
+
+prob_t PhraseJointBase::p0(const vector<WordID>& vsrc,
+ const vector<WordID>& vtrg,
+ int start_src, int start_trg) const {
+ const int flen = vsrc.size() - start_src;
+ const int elen = vtrg.size() - start_trg;
+ prob_t uniform_src_alignment; uniform_src_alignment.logeq(-log(flen + 1));
+ prob_t p;
+ p.logeq(Md::log_poisson(flen, 1.0)); // flen ~Pois(1)
+ // elen | flen ~Pois(flen + 0.01)
+ prob_t ptrglen; ptrglen.logeq(Md::log_poisson(elen, flen + 0.01));
+ p *= ptrglen;
+ p *= kUNIFORM_SOURCE.pow(flen); // each f in F ~Uniform
+ for (int i = 0; i < elen; ++i) { // for each position i in E
+ const WordID trg = vtrg[i + start_trg];
+ prob_t tp = prob_t::Zero();
+ for (int j = -1; j < flen; ++j) {
+ const WordID src = j < 0 ? 0 : vsrc[j + start_src];
+ tp += kM1MIXTURE * model1(src, trg);
+ tp += kUNIFORM_MIXTURE * kUNIFORM_TARGET;
+ }
+ tp *= uniform_src_alignment; // draw a_i ~uniform
+ p *= tp; // draw e_i ~Model1(f_a_i) / uniform
+ }
+ if (p.is_0()) {
+ cerr << "Zero! " << vsrc << "\nTRG=" << vtrg << endl;
+ abort();
+ }
+ return p;
+}
+
+prob_t PhraseJointBase_BiDir::p0(const vector<WordID>& vsrc,
+ const vector<WordID>& vtrg,
+ int start_src, int start_trg) const {
+ const int flen = vsrc.size() - start_src;
+ const int elen = vtrg.size() - start_trg;
+ prob_t uniform_src_alignment; uniform_src_alignment.logeq(-log(flen + 1));
+ prob_t uniform_trg_alignment; uniform_trg_alignment.logeq(-log(elen + 1));
+
+ prob_t p1;
+ p1.logeq(Md::log_poisson(flen, 1.0)); // flen ~Pois(1)
+ // elen | flen ~Pois(flen + 0.01)
+ prob_t ptrglen; ptrglen.logeq(Md::log_poisson(elen, flen + 0.01));
+ p1 *= ptrglen;
+ p1 *= kUNIFORM_SOURCE.pow(flen); // each f in F ~Uniform
+ for (int i = 0; i < elen; ++i) { // for each position i in E
+ const WordID trg = vtrg[i + start_trg];
+ prob_t tp = prob_t::Zero();
+ for (int j = -1; j < flen; ++j) {
+ const WordID src = j < 0 ? 0 : vsrc[j + start_src];
+ tp += kM1MIXTURE * model1(src, trg);
+ tp += kUNIFORM_MIXTURE * kUNIFORM_TARGET;
+ }
+ tp *= uniform_src_alignment; // draw a_i ~uniform
+ p1 *= tp; // draw e_i ~Model1(f_a_i) / uniform
+ }
+ if (p1.is_0()) {
+ cerr << "Zero! " << vsrc << "\nTRG=" << vtrg << endl;
+ abort();
+ }
+
+ prob_t p2;
+ p2.logeq(Md::log_poisson(elen, 1.0)); // elen ~Pois(1)
+ // flen | elen ~Pois(flen + 0.01)
+ prob_t psrclen; psrclen.logeq(Md::log_poisson(flen, elen + 0.01));
+ p2 *= psrclen;
+ p2 *= kUNIFORM_TARGET.pow(elen); // each f in F ~Uniform
+ for (int i = 0; i < flen; ++i) { // for each position i in E
+ const WordID src = vsrc[i + start_src];
+ prob_t tp = prob_t::Zero();
+ for (int j = -1; j < elen; ++j) {
+ const WordID trg = j < 0 ? 0 : vtrg[j + start_trg];
+ tp += kM1MIXTURE * invmodel1(trg, src);
+ tp += kUNIFORM_MIXTURE * kUNIFORM_SOURCE;
+ }
+ tp *= uniform_trg_alignment; // draw a_i ~uniform
+ p2 *= tp; // draw e_i ~Model1(f_a_i) / uniform
+ }
+ if (p2.is_0()) {
+ cerr << "Zero! " << vsrc << "\nTRG=" << vtrg << endl;
+ abort();
+ }
+
+ static const prob_t kHALF(0.5);
+ return (p1 + p2) * kHALF;
+}
+
+JumpBase::JumpBase() : p(200) {
+ for (unsigned src_len = 1; src_len < 200; ++src_len) {
+ map<int, prob_t>& cpd = p[src_len];
+ int min_jump = 1 - src_len;
+ int max_jump = src_len;
+ prob_t z;
+ for (int j = min_jump; j <= max_jump; ++j) {
+ prob_t& cp = cpd[j];
+ if (j < 0)
+ cp.logeq(Md::log_poisson(1.5-j, 1));
+ else if (j > 0)
+ cp.logeq(Md::log_poisson(j, 1));
+ cp.poweq(0.2);
+ z += cp;
+ }
+ for (int j = min_jump; j <= max_jump; ++j) {
+ cpd[j] /= z;
+ }
+ }
+}
+
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