From 769dfa1e69c22d4aea37840a955db7fd2cf3a4d7 Mon Sep 17 00:00:00 2001
From: Michael Denkowski <mdenkows@cs.cmu.edu>
Date: Tue, 17 Sep 2013 12:46:02 -0700
Subject: Save/load weights in stream mira

---
 training/mira/kbest_cut_mira.cc | 15 ++++++++++++++-
 utils/weights.cc                | 26 ++++++++++++++++++++++++++
 utils/weights.h                 |  5 +++++
 3 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/training/mira/kbest_cut_mira.cc b/training/mira/kbest_cut_mira.cc
index a9a4aeb6..59fa860a 100644
--- a/training/mira/kbest_cut_mira.cc
+++ b/training/mira/kbest_cut_mira.cc
@@ -745,10 +745,23 @@ int main(int argc, char** argv) {
                   delim = buf.find(" ||| ");
         		  ds->update(buf.substr(delim + 5));
         		  buf = buf.substr(0, delim);
+              } else if (cmd == "WEIGHTS") {
+                  // WEIGHTS ||| WRITE
+                  if (buf == "WRITE") {
+                      cout << Weights::GetString(dense_weights) << endl;
+                  // WEIGHTS ||| f1=w1 f2=w2 ...
+                  } else {
+                      Weights::UpdateFromString(buf, dense_weights);
+                  }
+                  continue;
+              } else {
+                  cerr << "Error: cannot parse command, skipping line:" << endl;
+                  cerr << cmd << " ||| " << buf << endl;
+                  continue;
               }
-              // TODO: additional commands
     	  }
       }
+      // Regular mode or LEARN line from stream mode
       //TODO: allow batch updating
       lambdas.init_vector(&dense_weights);
       dense_w_local = dense_weights;
diff --git a/utils/weights.cc b/utils/weights.cc
index 575877b6..1284f686 100644
--- a/utils/weights.cc
+++ b/utils/weights.cc
@@ -4,6 +4,7 @@
 
 #include "fdict.h"
 #include "filelib.h"
+#include "stringlib.h"
 #include "verbose.h"
 
 using namespace std;
@@ -156,4 +157,29 @@ void Weights::ShowLargestFeatures(const vector<weight_t>& w) {
   cerr << endl;
 }
 
+string Weights::GetString(const vector<weight_t>& w,
+                          bool hide_zero_value_features) {
+    ostringstream os;
+    os.precision(17);
+    int nf = FD::NumFeats();
+    for (unsigned i = 1; i < nf; i++) {
+        if (hide_zero_value_features && w[i] == 0.0) {
+            continue;
+        }
+        os << FD::Convert(i) << '=' << w[i];
+        if (i < nf - 1) {
+            os << ' ';
+        }
+    }
+    return os.str();
+}
 
+void Weights::UpdateFromString(string& w_string,
+                               vector<weight_t>& w) {
+    vector<string> tok = SplitOnWhitespace(w_string);
+    for (vector<string>::iterator i = tok.begin(); i != tok.end(); i++) {
+        int delim = i->find('=');
+        int fid = FD::Convert(i->substr(0, delim));
+        w[fid] = strtod(i->substr(delim + 1).c_str(), NULL);
+    }
+}
diff --git a/utils/weights.h b/utils/weights.h
index 30f71db0..920fdd75 100644
--- a/utils/weights.h
+++ b/utils/weights.h
@@ -23,6 +23,11 @@ class Weights {
   static void SanityCheck(const std::vector<weight_t>& w);
   // write weights with largest magnitude to cerr
   static void ShowLargestFeatures(const std::vector<weight_t>& w);
+  static std::string GetString(const std::vector<weight_t>& w,
+                               bool hide_zero_value_features = true);
+  // Assumes weights are already initialized for now
+  static void UpdateFromString(std::string& w_string,
+                               std::vector<weight_t>& w);
  private:
   Weights();
 };
-- 
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