enable msvc win32 project

windows/README.md

@@ -4,6 +4,7 @@ How to Build Windows Version
 =====
 * Open the solution file with Visual Studio
 * Select x64 and Release in build
+	- For 32bit windows or python, try win32 and Release (not fully tested)
 * Rebuild all
 
 This should give you xgboost.exe for CLI version and xgboost_wrapper.dll for python

windows/xgboost/xgboost.vcxproj

@@ -93,11 +93,14 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
+      <OpenMPSupport>true</OpenMPSupport>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>$(OutDir)\rabit.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">

windows/xgboost_wrapper/xgboost_wrapper.vcxproj

@@ -95,11 +95,13 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <OpenMPSupport>true</OpenMPSupport>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>$(OutDir)\rabit.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">

wrapper/setup.py

@@ -1,5 +1,5 @@
 import os
-
+import platform
 from setuptools import setup
 
 
@@ -11,7 +11,10 @@ curr_dir = os.path.dirname(os.path.abspath(__file__))
 dll_path = [curr_dir]
 
 if os.name == 'nt':
-    dll_path.append(os.path.join(curr_dir, '../windows/x64/Release/'))
+    if platform.architecture()[0] == '64bit':
+        dll_path.append(os.path.join(curr_dir, '../windows/Release/'))
+    else:
+        dll_path.append(os.path.join(curr_dir, '../windows/x64/Release/'))
 
 if os.name == 'nt':
     dll_path = [os.path.join(p, 'xgboost_wrapper.dll') for p in dll_path]

wrapper/xgboost.py

@@ -13,6 +13,7 @@ import os
 import sys
 import re
 import ctypes
+import platform
 import collections
 
 import numpy as np
@@ -40,7 +41,11 @@ else:
 def load_xglib():
     curr_path = os.path.dirname(os.path.abspath(os.path.expanduser(__file__)))
     dll_path = [curr_path]
-    dll_path.append(os.path.join(curr_path, '../windows/x64/Release/'))
+    if os.name == 'nt':
+        if platform.architecture()[0] == '64bit':
+            dll_path.append(os.path.join(curr_dir, '../windows/Release/'))
+        else:
+            dll_path.append(os.path.join(curr_dir, '../windows/x64/Release/'))
 
     if os.name == 'nt':
         dll_path = [os.path.join(p, 'xgboost_wrapper.dll') for p in dll_path]

wrapper/xgboost_wrapper.cpp

@@ -266,7 +266,7 @@ extern "C"{
     pmat->info.group_ptr.resize(len + 1);
     pmat->info.group_ptr[0] = 0;
     for (uint64_t i = 0; i < len; ++i) {
-      pmat->info.group_ptr[i+1] = pmat->info.group_ptr[i]+group[i];
+      pmat->info.group_ptr[i+1] = pmat->info.group_ptr[i] + group[i];
     }
   }
   const float* XGDMatrixGetFloatInfo(const void *handle, const char *field, bst_ulong* len) {