From 33d4601da5e2e715260619a38f5899645d157952 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Tue, 8 May 2012 19:45:10 -0400
Subject: switch to liblbfgs for pro

---
 training/liblbfgs/lbfgs++.h  | 36 ++++++++++++++++++++++--------------
 training/liblbfgs/ll_test.cc |  9 ++++-----
 2 files changed, 26 insertions(+), 19 deletions(-)

(limited to 'training')

diff --git a/training/liblbfgs/lbfgs++.h b/training/liblbfgs/lbfgs++.h
index 119511e5..6c4d1807 100644
--- a/training/liblbfgs/lbfgs++.h
+++ b/training/liblbfgs/lbfgs++.h
@@ -9,9 +9,10 @@
 #define __LBFGSPP_H__
 
 #include <vector>
+#include <cassert>
 #include "liblbfgs/lbfgs.h"
 
-// Function must be lbfgsfloatval_t f(const double* x_start, double* g_start)
+// Function must be double f(const vector<double>& x_start, double* g_start)
 template <typename Function>
 class LBFGS {
  public:
@@ -46,11 +47,14 @@ class LBFGS {
   lbfgsfloatval_t& operator[](size_t i) { return m_x[i]; }
   size_t size() const { return m_x.size(); }
 
-  int Optimize() {
+  int MinimizeFunction(bool s = false) {
+    silence = s;
     lbfgsfloatval_t fx;
     int ret = lbfgs(m_x.size(), &m_x[0], &fx, _evaluate, _progress, this, &param);
-    std::cerr << "L-BFGS optimization terminated with status code = " << ret << std::endl;
-    std::cerr << "  fx = " << fx << std::endl;
+    if (!silence) {
+      std::cerr << "L-BFGS optimization terminated with status code = " << ret << std::endl;
+      std::cerr << "  fx = " << fx << std::endl;
+    }
     return ret;
   }
 
@@ -62,6 +66,7 @@ class LBFGS {
       param.linesearch = LBFGS_LINESEARCH_BACKTRACKING;
       param.orthantwise_c = 1.0;
     }
+    silence = false;
   }
 
   static lbfgsfloatval_t _evaluate(
@@ -79,7 +84,8 @@ class LBFGS {
                              const lbfgsfloatval_t step) {
       (void) n;
       (void) step;
-      return func(x, g);
+      assert(x == &m_x[0]);  // sanity check, ensures pass m_x is okay
+      return func(m_x, g);
     }
 
     static int _progress(
@@ -109,21 +115,23 @@ class LBFGS {
         int n,
         int k,
         int ls
-        )
-    {
-        (void) n;
-        (void) k;
-        std::cerr << "Iteration " << k << ':' << std::endl;
-        std::cerr << "  fx = " << fx << ", x[0] = " << x[0] << ", x[1] = " << x[1] << std::endl;
-        std::cerr << "  xnorm = " << xnorm << ", gnorm = " << gnorm << ", step = " << step << std::endl << std::endl;
-        return 0;
+        ) {
+    (void) x;
+    (void) g;
+    (void) n;
+    (void) ls;
+    if (!silence) {
+      std::cerr << "Iteration " << k << ':' << "\tfx = " << fx << "\t"
+                << "  xnorm = " << xnorm << ", gnorm = " << gnorm << ", step = " << step << std::endl;
     }
+    return 0;
+  }
   std::vector<lbfgsfloatval_t>* p_x;
   const bool owned;
   std::vector<lbfgsfloatval_t>& m_x;
   const Function& func;
   lbfgs_parameter_t param;
-
+  bool silence;
 };
 
 #endif
diff --git a/training/liblbfgs/ll_test.cc b/training/liblbfgs/ll_test.cc
index 058db716..43c0f214 100644
--- a/training/liblbfgs/ll_test.cc
+++ b/training/liblbfgs/ll_test.cc
@@ -4,12 +4,11 @@
 using namespace std;
 
 // Function must be lbfgsfloatval_t f(x.begin, x.end, g.begin)
-lbfgsfloatval_t func(const lbfgsfloatval_t* x, lbfgsfloatval_t* g) {
+lbfgsfloatval_t func(const vector<lbfgsfloatval_t>& x, lbfgsfloatval_t* g) {
     int i;
     lbfgsfloatval_t fx = 0.0;
-    int n = 4;
 
-    for (i = 0;i < n;i += 2) {
+    for (i = 0;i < x.size();i += 2) {
         lbfgsfloatval_t t1 = 1.0 - x[i];
         lbfgsfloatval_t t2 = 10.0 * (x[i+1] - x[i] * x[i]);
         g[i+1] = 20.0 * t2;
@@ -21,8 +20,8 @@ lbfgsfloatval_t func(const lbfgsfloatval_t* x, lbfgsfloatval_t* g) {
 
 template<typename F>
 void Opt(F& f) {
-  LBFGS<F> lbfgs(4, f, 1.0);
-  lbfgs.Optimize();
+  LBFGS<F> lbfgs(4, f);
+  lbfgs.MinimizeFunction();
 }
 
 int main(int argc, char** argv) {
-- 
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