Unify sampling backoff strategy.

1 files changed, 0 insertions, 78 deletions

diff --git a/extractor/sampler.cc b/extractor/sampler.cc
deleted file mode 100644
index 887aaec1..00000000
--- a/extractor/sampler.cc
+++ /dev/null
@@ -1,78 +0,0 @@
-#include "sampler.h"
-
-#include "phrase_location.h"
-#include "suffix_array.h"
-
-namespace extractor {
-
-Sampler::Sampler(shared_ptr<SuffixArray> suffix_array, int max_samples) :
-    suffix_array(suffix_array), max_samples(max_samples) {}
-
-Sampler::Sampler() {}
-
-Sampler::~Sampler() {}
-
-PhraseLocation Sampler::Sample(
-    const PhraseLocation& location,
-    const unordered_set<int>& blacklisted_sentence_ids) const {
-  shared_ptr<DataArray> source_data_array = suffix_array->GetData();
-  vector<int> sample;
-  int num_subpatterns;
-  if (location.matchings == NULL) {
-    // Sample suffix array range.
-    num_subpatterns = 1;
-    int low = location.sa_low, high = location.sa_high;
-    double step = max(1.0, (double) (high - low) / max_samples);
-    double i = low, last = i - 1;
-    while (sample.size() < max_samples && i < high) {
-      int x = suffix_array->GetSuffix(Round(i));
-      int id = source_data_array->GetSentenceId(x);
-      bool found = false;
-      if (blacklisted_sentence_ids.count(id)) {
-        for (int backoff_step = 1; backoff_step <= step; ++backoff_step) {
-          double j = i - backoff_step;
-          x = suffix_array->GetSuffix(Round(j));
-          id = source_data_array->GetSentenceId(x);
-          if (x >= 0 && j > last && !blacklisted_sentence_ids.count(id)) {
-            found = true;
-            last = i;
-            break;
-          }
-          double k = i + backoff_step;
-          x = suffix_array->GetSuffix(Round(k));
-          id = source_data_array->GetSentenceId(x);
-          if (k < min(i+step, (double) high) &&
-              !blacklisted_sentence_ids.count(id)) {
-            found = true;
-            last = k;
-            break;
-          }
-        }
-      } else {
-        found = true;
-        last = i;
-      }
-      if (found) sample.push_back(x);
-      i += step;
-    }
-  } else {
-    // Sample vector of occurrences.
-    num_subpatterns = location.num_subpatterns;
-    int num_matchings = location.matchings->size() / num_subpatterns;
-    double step = max(1.0, (double) num_matchings / max_samples);
-    for (double i = 0, num_samples = 0;
-         i < num_matchings && num_samples < max_samples;
-         i += step, ++num_samples) {
-      int start = Round(i) * num_subpatterns;
-      sample.insert(sample.end(), location.matchings->begin() + start,
-          location.matchings->begin() + start + num_subpatterns);
-    }
-  }
-  return PhraseLocation(sample, num_subpatterns);
-}
-
-int Sampler::Round(double x) const {
-  return x + 0.5;
-}
-
-} // namespace extractor