Compile classification.cpp exactly the same as example/classification but runs on GPU mode

[rock king]

My question is here:

## In caffe root compile and run:
```
./build/examples/cpp_classification/classification.bin \
  models/bvlc_reference_caffenet/deploy.prototxt \
  models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel \
  data/ilsvrc12/imagenet_mean.binaryproto \
  data/ilsvrc12/synset_words.txt \
  examples/images/cat.jpg
```
The output should look like this:
```
fps: 20.523036
0.3134 - "n02123045 tabby, tabby cat"
0.2380 - "n02123159 tiger cat"
0.1235 - "n02124075 Egyptian cat"
0.1003 - "n02119022 red fox, Vulpes vulpes"
0.0715 - "n02127052 lynx, catamount"
```

## Copy classification.cpp to a seperate folder, write a makefile compile and run:
```
make

./classification.bin \
  /media/elab/sdd/caffe/models/bvlc_reference_caffenet/deploy.prototxt \
  /media/elab/sdd/caffe/models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel \
  /media/elab/sdd/caffe/data/ilsvrc12/imagenet_mean.binaryproto \
  /media/elab/sdd/caffe/data/ilsvrc12/synset_words.txt \
  /media/elab/sdd/caffe/examples/images/cat.jpg
```

```
fps: 2.953781
0.3132 - "n02123045 tabby, tabby cat"
0.2379 - "n02123159 tiger cat"
0.1235 - "n02124075 Egyptian cat"
0.1005 - "n02119022 red fox, Vulpes vulpes"
0.0715 - "n02127052 lynx, catamount"
Segmentation fault (core dumped)

```
The speed is the same as running on cpu mode in caffe root.

## The problems are:
1. Using exactly the same code, but the first with fps 10 x speed of the second.
2. Why Segmentation fault in the second run?

## Problems may be lies in makefile, my makefile:
```
CC=gcc

CAFFEPATH=/media/elab/sdd/caffe/build/install

VPATH=$(CAFFEPATH)

LDFLAGS= `pkg-config --libs opencv` -L$(CAFFEPATH)/lib -lcaffe-nv -lproto  \
    -L/usr/local/cuda/lib64 -lcuda -lcudart -lcublas -lcurand -lcudnn \
    -lboost_system -lboost_filesystem -lboost_regex -lglog

CXXFLAGS= -Wall `pkg-config --cflags opencv` -lstdc++ -lm -std=c++0x -I$(CAFFEPATH)/include/ \
    -I/usr/local/cuda/include/ -DUSE_OPENCV

DEPS = $(wildcard */*.h) $(wildcard $(CAFFEPATH)/include/*/*.hpp)

classification.bin: classification.o
    $(CC) -o $@ $^ $(LDFLAGS) $(CXXFLAGS)

.PHONY: clean

clean:
    rm -rf */*.o *.o *.bin
```

Any one could help me? It's quite confusing and urgent for me.