From c8341c0bf4d333e34354e3bed5c18606f64f474e Mon Sep 17 00:00:00 2001
From: "Wu, Ke" <wuke@cs.umd.edu>
Date: Fri, 10 Oct 2014 11:53:38 -0400
Subject: Allow erasure of part of state

---
 decoder/ffset.cc | 58 ++++++++++++--------------------------------------------
 1 file changed, 12 insertions(+), 46 deletions(-)

(limited to 'decoder/ffset.cc')

diff --git a/decoder/ffset.cc b/decoder/ffset.cc
index 488346bc..8ba70389 100644
--- a/decoder/ffset.cc
+++ b/decoder/ffset.cc
@@ -14,25 +14,10 @@ ModelSet::ModelSet(const vector<double>& w, const vector<const FeatureFunction*>
   for (int i = 0; i < models_.size(); ++i) {
     model_state_pos_[i] = state_size_;
     state_size_ += models_[i]->StateSize();
-  }
-
-  //added by lijunhui
-  //erase the states for SRLReorderFeature and DepPrnFeatures
-  for (int i = 0; i < models_.size(); i++) {
-    if (models_[i]->name_ == string("SRLReorderFeature")
-      || models_[i]->name_ == string("DepPrnFeatures")
-      || models_[i]->name_ == string("SyntacticContextFeature")
-      || models_[i]->name_ == string("ArgtReorderFeature")
-      || models_[i]->name_ == string("ConstReorderSparseFeature")
-      || models_[i]->name_ == string("ConstReorderFeature")) {
-      int start_pos = model_state_pos_[i];
-      int end_pos;
-      if (i == models_.size() - 1)
-        end_pos = state_size_;
-      else
-        end_pos = model_state_pos_[i + 1];
-      erase_state_start_pos_.push_back(start_pos);
-      erase_state_end_pos_.push_back(end_pos);
+    int num_ignored_bytes = models_[i]->IgnoredStateSize();
+    if (num_ignored_bytes > 0) {
+      ranges_to_erase_.push_back(
+          {state_size_ - num_ignored_bytes, state_size_});
     }
   }
 }
@@ -90,32 +75,13 @@ void ModelSet::AddFinalFeatures(const FFState& state, HG::Edge* edge,SentenceMet
   edge->edge_prob_.logeq(edge->feature_values_.dot(weights_));
 }
 
-bool ModelSet::HaveEraseState() const {
-       if (erase_state_start_pos_.size() == 0) return false;
-       return true;
-}
-
-void ModelSet::GetRealFFState(const FFState& state, FFState& real_state) const {
-       real_state.resize(state.size());
-       for (int i = 0; i < state.size(); i++) {
-               real_state[i] = state[i];
-       }
-
-       if (state.size() == 0)
-               return;
-       assert(state.size() == state_size_);
+bool ModelSet::NeedsStateErasure() const { return !ranges_to_erase_.empty(); }
 
-       //erase the states for SRLReorderFeature and DepPrnFeatures and SyntacticContextFeature
-       for (int i = 0; i < erase_state_start_pos_.size(); i++){
-               int start_pos = erase_state_start_pos_[i];
-               int end_pos = erase_state_end_pos_[i];
-               for (int j = start_pos; j < end_pos; j++)
-                       real_state[j] = 0;
-       }
-}
-
-FFState ModelSet::GetRealFFState(const FFState& state) const {
-       FFState real_state;
-       GetRealFFState(state, real_state);
-       return real_state;
+void ModelSet::EraseIgnoredBytes(FFState* state) const {
+  // TODO: can we memset?
+  for (const auto& range : ranges_to_erase_) {
+    for (int i = range.first; i < range.second; ++i) {
+      (*state)[i] = 0;
+    }
+  }
 }
-- 
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