remove boost dependecies

(refer to BVLC#2537)

Makefile.mobile

@@ -54,6 +54,7 @@ src/caffe/layers/mvn_layer.cpp \
 src/caffe/layers/neuron_layer.cpp \
 src/caffe/layers/pooling_layer.cpp \
 src/caffe/layers/power_layer.cpp \
+src/caffe/layers/prelu_layer.cpp \
 src/caffe/layers/relu_layer.cpp \
 src/caffe/layers/sigmoid_cross_entropy_loss_layer.cpp \
 src/caffe/layers/sigmoid_layer.cpp \
@@ -94,8 +95,8 @@ OBJS := $(PROTO_OBJS) $(CXX_OBJS)
 COMMON_FLAGS += -DCPU_ONLY
 
 INCLUDE_DIRS += ./include ./include/caffe/proto
-LIBRARIES:=protobuf opencv_core opencv_highgui opencv_imgproc boost_thread boost_system boost_date_time
-LIBRARY_DIRS:=/usr/local/lib
+LIBRARIES := protobuf opencv_core opencv_highgui opencv_imgproc
+LIBRARY_DIRS := /usr/local/lib
 
 ifeq ($(USE_EIGEN), y)
 	COMMON_FLAGS += -DUSE_EIGEN

include/caffe/common.hpp

@@ -3,6 +3,7 @@
 
 #include "caffe/glog_alternate.hpp"
 
+#include <unistd.h>
 #include <memory>
 #include <climits>
 #include <cmath>
@@ -61,7 +62,6 @@ namespace cv { class Mat; }
 namespace caffe {
 
 // Common functions and classes from std that caffe often uses.
-using std::shared_ptr;
 using std::fstream;
 using std::ios;
 using std::isnan;
@@ -72,6 +72,7 @@ using std::map;
 using std::ostringstream;
 using std::pair;
 using std::set;
+using std::shared_ptr;
 using std::string;
 using std::stringstream;
 using std::vector;
@@ -93,7 +94,7 @@ class Caffe {
   }
   enum Brew { CPU, GPU };
 
-  // This random number generator facade hides boost and CUDA rng
+  // This random number generator facade hides std and CUDA rng
   // implementation from one another (for cross-platform compatibility).
   class RNG {
    public:
@@ -107,7 +108,7 @@ class Caffe {
     shared_ptr<Generator> generator_;
   };
 
-  // Getters for boost rng, curand, and cublas handles
+  // Getters for std rng, curand, and cublas handles
   inline static RNG& rng_stream() {
     if (!Get().random_generator_) {
       Get().random_generator_.reset(new RNG());
@@ -129,7 +130,7 @@ class Caffe {
   // freed in a non-pinned way, which may cause problems - I haven't verified
   // it personally but better to note it here in the header file.
   inline static void set_mode(Brew mode) { Get().mode_ = mode; }
-  // Sets the random seed of both boost and curand
+  // Sets the random seed of both std and curand
   static void set_random_seed(const unsigned int seed);
   // Sets the device. Since we have cublas and curand stuff, set device also
   // requires us to reset those values.

include/caffe/internal_thread.hpp

@@ -1,18 +1,14 @@
 #ifndef CAFFE_INTERNAL_THREAD_HPP_
 #define CAFFE_INTERNAL_THREAD_HPP_
 
-#include "caffe/common.hpp"
+#include <thread>
 
-/**
- Forward declare boost::thread instead of including boost/thread.hpp
- to avoid a boost/NVCC issues (#1009, #1010) on OSX.
- */
-namespace boost { class thread; }
+#include "caffe/common.hpp"
 
 namespace caffe {
 
 /**
- * Virtual class encapsulate boost::thread for use in base class
+ * Virtual class encapsulate std::thread for use in base class
  * The child class will acquire the ability to run a single thread,
  * by reimplementing the virutal function InternalThreadEntry.
  */
@@ -34,7 +30,7 @@ class InternalThread {
       with the code you want your thread to run. */
   virtual void InternalThreadEntry() {}
 
-  shared_ptr<boost::thread> thread_;
+  shared_ptr<std::thread> thread_;
 };
 
 }  // namespace caffe