From bfefc1215867094d808424289df39fc590641d83 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Thu, 14 Apr 2011 15:52:13 -0400
Subject: mpi update

---
 training/mpi_batch_optimize.cc | 56 +++++++++++++++++++++---------------------
 1 file changed, 28 insertions(+), 28 deletions(-)

diff --git a/training/mpi_batch_optimize.cc b/training/mpi_batch_optimize.cc
index 8f45aef1..11be8bbe 100644
--- a/training/mpi_batch_optimize.cc
+++ b/training/mpi_batch_optimize.cc
@@ -5,7 +5,9 @@
 #include <cmath>
 
 #ifdef HAVE_MPI
-#include <mpi.h>
+#include <boost/mpi/timer.hpp>
+#include <boost/mpi.hpp>
+namespace mpi = boost::mpi;
 #endif
 
 #include <boost/shared_ptr.hpp>
@@ -57,7 +59,7 @@ void ShowLargestFeatures(const vector<double>& w) {
   cerr << endl;
 }
 
-void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
+bool InitCommandLine(int argc, char** argv, po::variables_map* conf) {
   po::options_description opts("Configuration options");
   opts.add_options()
         ("input_weights,w",po::value<string>(),"Input feature weights file")
@@ -87,18 +89,13 @@ void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
 
   if (conf->count("help") || !conf->count("input_weights") || !(conf->count("training_data") | conf->count("sharded_input")) || !conf->count("decoder_config")) {
     cerr << dcmdline_options << endl;
-#ifdef HAVE_MPI
-    MPI::Finalize();
-#endif
-    exit(1);
+    return false;
   }
   if (conf->count("training_data") && conf->count("sharded_input")) {
     cerr << "Cannot specify both --training_data and --sharded_input\n";
-#ifdef HAVE_MPI
-    MPI::Finalize();
-#endif
-    exit(1);
+    return false;
   }
+  return true;
 }
 
 void ReadTrainingCorpus(const string& fname, int rank, int size, vector<string>* c) {
@@ -212,11 +209,22 @@ void StoreConfig(const vector<string>& cfg, istringstream* o) {
   o->str(os.str());
 }
 
+template <typename T>
+struct VectorPlus : public binary_function<vector<T>, vector<T>, vector<T> >  {
+  vector<T> operator()(const vector<int>& a, const vector<int>& b) const {
+    assert(a.size() == b.size());
+    vector<T> v(a.size());
+    transform(a.begin(), a.end(), b.begin(), v.begin(), plus<T>()); 
+    return v;
+  } 
+}; 
+
 int main(int argc, char** argv) {
 #ifdef HAVE_MPI
-  MPI::Init(argc, argv);
-  const int size = MPI::COMM_WORLD.Get_size(); 
-  const int rank = MPI::COMM_WORLD.Get_rank();
+  mpi::environment env(argc, argv);
+  mpi::communicator world;
+  const int size = world.size(); 
+  const int rank = world.rank();
 #else
   const int size = 1;
   const int rank = 0;
@@ -225,16 +233,13 @@ int main(int argc, char** argv) {
   register_feature_functions();
 
   po::variables_map conf;
-  InitCommandLine(argc, argv, &conf);
+  if (!InitCommandLine(argc, argv, &conf)) return 1;
 
   string shard_dir;
   if (conf.count("sharded_input")) {
     shard_dir = conf["sharded_input"].as<string>();
     if (!DirectoryExists(shard_dir)) {
       if (rank == 0) cerr << "Can't find shard directory: " << shard_dir << endl;
-#ifdef HAVE_MPI
-      MPI::Finalize();
-#endif
       return 1;
     }
     if (rank == 0)
@@ -272,9 +277,7 @@ int main(int argc, char** argv) {
   Decoder* decoder = new Decoder(&ini);
   if (decoder->GetConf()["input"].as<string>() != "-") {
     cerr << "cdec.ini must not set an input file\n";
-#ifdef HAVE_MPI
-    MPI::COMM_WORLD.Abort(1);
-#endif
+    return 1;
   }
   if (rank == 0) cerr << "Done loading grammar!\n";
 
@@ -343,8 +346,8 @@ int main(int argc, char** argv) {
 
     double to = 0;
 #ifdef HAVE_MPI
-    MPI::COMM_WORLD.Reduce(const_cast<double*>(&gradient.data()[0]), &rcv_grad[0], num_feats, MPI::DOUBLE, MPI::SUM, 0);
-    MPI::COMM_WORLD.Reduce(&objective, &to, 1, MPI::DOUBLE, MPI::SUM, 0);
+    mpi::reduce(world, &gradient[0], &rcv_grad[0], gradient.size(), plus<double>(), 0);
+    mpi::reduce(world, objective, to, plus<double>(), 0);
     swap(gradient, rcv_grad);
     objective = to;
 #endif
@@ -395,14 +398,11 @@ int main(int argc, char** argv) {
     }  // rank == 0
     int cint = converged;
 #ifdef HAVE_MPI
-    MPI::COMM_WORLD.Bcast(const_cast<double*>(&lambdas.data()[0]), num_feats, MPI::DOUBLE, 0);
-    MPI::COMM_WORLD.Bcast(&cint, 1, MPI::INT, 0);
-    MPI::COMM_WORLD.Barrier();
+    mpi::broadcast(world, lambdas, 0);
+    mpi::broadcast(world, cint, 0);
+    world.barrier();
 #endif
     converged = cint;
   }
-#ifdef HAVE_MPI
-  MPI::Finalize(); 
-#endif
   return 0;
 }
-- 
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