From a30a2e59ff117ad6bae80ece2bf535767daf7db6 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

---
 utils/weights.cc | 26 ++++++++++++++++++++++++++
 utils/weights.h  |  5 +++++
 2 files changed, 31 insertions(+)

(limited to 'utils')

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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