install caffe in macOS 10.13.2(CPU-Only)

Caffe是一个清晰而高效的深度学习框架，是纯粹的C++、CUDA架构，支持命令行，Python和MATLAB接口，可以在CPU和GPU直接无缝切换，Caffe的优势:

1. 上手快,模型和相应优化都是以文本形式而非代码形式给出,Caffe给出了模型的定义，最优化设置以及预训练的权重，方便立即上手。
2. 速度快，Caffe与cuDNN结合使用，能够运行最棒的模型和海量的数据。
3. 模块化，方便拓展新的认知和设置.
4. 开源，开放

本文主要用于记录在MacBookPro笔记本电脑中安装Caffe(CPU-Only)框架。并使用最简单的LeNet识别的Mnist手写数字训练集：http://caffe.berkeleyvision.org/gathered/examples/mnist.html

1.安装Homebrew

打开你的terminal~输入

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

2.安装CMake

brew install cmake

3.安装依赖

terminal输入

brew install git openblas python
brew install --fresh -vd snappy leveldb gflags glog szip hdf5 lmdb homebrew/science/opencv
brew install --fresh -vd --with-python  protobuf
brew install --fresh -vd boost boost-python

我这里安装的是python3版本：

brew install python3

4.安装Caffe

下载 Caffe 并修改配置

首先进入安装目录

cd  /usr/local/Cellar

下载并修改：

git clone https://github.com/BVLC/caffe.git  
cd caffe  
cp Makefile.config.example Makefile.config

其实我们用的CMake不用改Makefile.config可是心理作用还是改一下吧，找到Makefile.config（刚copy出来的）搜索CPU_ONLY :＝ 1 ，取消注释

修改后的 Makefile.config

## Refer to http://caffe.berkeleyvision.org/installation.html
# Contributions simplifying and improving our build system are welcome!

# cuDNN acceleration switch (uncomment to build with cuDNN).
# USE_CUDNN := 1

# CPU-only switch (uncomment to build without GPU support).
CPU_ONLY := 1

# uncomment to disable IO dependencies and corresponding data layers
# USE_OPENCV := 0
# USE_LEVELDB := 0
# USE_LMDB := 0

# uncomment to allow MDB_NOLOCK when reading LMDB files (only if necessary)
#	You should not set this flag if you will be reading LMDBs with any
#	possibility of simultaneous read and write
# ALLOW_LMDB_NOLOCK := 1

# Uncomment if you're using OpenCV 3
OPENCV_VERSION := 3

# To customize your choice of compiler, uncomment and set the following.
# N.B. the default for Linux is g++ and the default for OSX is clang++
# CUSTOM_CXX := g++

# CUDA directory contains bin/ and lib/ directories that we need.
# CUDA_DIR := /usr/local/cuda
# On Ubuntu 14.04, if cuda tools are installed via
# "sudo apt-get install nvidia-cuda-toolkit" then use this instead:
# CUDA_DIR := /usr

# CUDA architecture setting: going with all of them.
# For CUDA < 6.0, comment the *_50 through *_61 lines for compatibility.
# For CUDA < 8.0, comment the *_60 and *_61 lines for compatibility.
# For CUDA >= 9.0, comment the *_20 and *_21 lines for compatibility.
# CUDA_ARCH := -gencode arch=compute_30,code=sm_30 \
#		-gencode arch=compute_35,code=sm_35 \
#		-gencode arch=compute_50,code=sm_50 \
#		-gencode arch=compute_52,code=sm_52 \
#		-gencode arch=compute_60,code=sm_60 \
#		-gencode arch=compute_61,code=sm_61 \
#		-gencode arch=compute_61,code=compute_61

# BLAS choice:
# atlas for ATLAS (default)
# mkl for MKL
# open for OpenBlas
BLAS := atlas
# Custom (MKL/ATLAS/OpenBLAS) include and lib directories.
# Leave commented to accept the defaults for your choice of BLAS
# (which should work)!
# BLAS_INCLUDE := /path/to/your/blas
# BLAS_LIB := /path/to/your/blas

# Homebrew puts openblas in a directory that is not on the standard search path
# BLAS_INCLUDE := $(shell brew --prefix openblas)/include
# BLAS_LIB := $(shell brew --prefix openblas)/lib

# This is required only if you will compile the matlab interface.
# MATLAB directory should contain the mex binary in /bin.
# MATLAB_DIR := /usr/local
# MATLAB_DIR := /Applications/MATLAB_R2012b.app

# NOTE: this is required only if you will compile the python interface.
# We need to be able to find Python.h and numpy/arrayobject.h.
# PYTHON_INCLUDE := /usr/include/python2.7 \
#		/usr/lib/python2.7/dist-packages/numpy/core/include
PYTHON_INCLUDE := /usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/include  \
                  /usr/local/Cellar/numpy/1.14.2/lib/python3.6/site-packages/numpy/core/include

# Anaconda Python distribution is quite popular. Include path:
# Verify anaconda location, sometimes it's in root.
# ANACONDA_HOME := $(HOME)/anaconda
# PYTHON_INCLUDE := $(ANACONDA_HOME)/include \
		# $(ANACONDA_HOME)/include/python2.7 \
		# $(ANACONDA_HOME)/lib/python2.7/site-packages/numpy/core/include

# Uncomment to use Python 3 (default is Python 2)
# PYTHON_LIBRARIES := boost_python3 python3.5m
# PYTHON_INCLUDE := /usr/include/python3.5m \
#                 /usr/lib/python3.5/dist-packages/numpy/core/include

# We need to be able to find libpythonX.X.so or .dylib.
PYTHON_LIB := /usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib
# PYTHON_LIB := $(ANACONDA_HOME)/lib

# Homebrew installs numpy in a non standard path (keg only)
# PYTHON_INCLUDE += $(dir $(shell python -c 'import numpy.core; print(numpy.core.__file__)'))/include
# PYTHON_LIB += $(shell brew --prefix numpy)/lib

# Uncomment to support layers written in Python (will link against Python libs)
WITH_PYTHON_LAYER := 1

# Whatever else you find you need goes here.
INCLUDE_DIRS := $(PYTHON_INCLUDE) /usr/local/include  /usr/local/Cellar/opencv/3.4.1_2/include

LIBRARY_DIRS := $(PYTHON_LIB) /usr/local/lib /usr/lib  /usr/local/Cellar/opencv/3.4.1_2/lib

# If Homebrew is installed at a non standard location (for example your home directory) and you use it for general dependencies
# INCLUDE_DIRS += $(shell brew --prefix)/include
# LIBRARY_DIRS += $(shell brew --prefix)/lib

# NCCL acceleration switch (uncomment to build with NCCL)
# https://github.com/NVIDIA/nccl (last tested version: v1.2.3-1+cuda8.0)
# USE_NCCL := 1

# Uncomment to use `pkg-config` to specify OpenCV library paths.
# (Usually not necessary -- OpenCV libraries are normally installed in one of the above $LIBRARY_DIRS.)
# USE_PKG_CONFIG := 1

# N.B. both build and distribute dirs are cleared on `make clean`
BUILD_DIR := build
DISTRIBUTE_DIR := distribute

# Uncomment for debugging. Does not work on OSX due to https://github.com/BVLC/caffe/issues/171
# DEBUG := 1

# The ID of the GPU that 'make runtest' will use to run unit tests.
TEST_GPUID := 0

# enable pretty build (comment to see full commands)
Q ?= @

安装caffe的python接口

cd /usr/local/Cellar/caffe

$ for req in $(cat requirements.txt); do pip3 install $req ; done

设置python环境变量

vi ~/.bash_profile

# Setting PATH for Python 3.6
# The original version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/3.6/bin:${PATH}"

# PATH="/usr/local/bin/python3${PATH}"
export PATH

export PYTHONPATH=/usr/local/Cellar/caffe/python:$PYTHONPATH

然后，让修改立即生效$ source ~/.bash_profile

5.安装

mkdir build  

cd build  

cmake ..  

打开CMakeCache.txt，将 CPU_ONLY:BOOL＝ 赋值ON。

打开CaffeConfig.cmake, 找到set(CPU_ONLY, OFF)，同样改成ON。

注意:不要在caffe目录下去执行make;会一直报错;

6.编译

make all
make install
make runtest

7.测试mnist

$ cd caffe
$ ./data/mnist/get_mnist.sh        #下载MNIST数据库并解压缩
$ ./examples/mnist/create_mnist.sh #将其转换成Lmdb数据库格式
$ vi examples/mnist/lenet_solver.prototxt # 设置solver_mode: CPU
$ ./examples/mnist/train_lenet.sh  # 训练网络</code>

在正式开始训练和测试我们的模型之前，先对LeNet有一个大致了解，如下图所示，它由一个卷积层、后面跟一个下采样层、再跟另外一个卷积层和另一个下采样层，再之后是两个全连接层组成。这里caffe中用的示例和original LeNet的区别是使用ReLU(Rectified Linear Unit)取代了sigmoid激活函数。

LeNet各层的属性在$CAFFE_ROOT/examples/mnist/lenet_train_test.prototxt中进行了定义。

vi ./examples/mnist/lenet_train_test.prototxt命令即可查看网络各层的定义。

name: "LeNet"   //网络名称是LeNet
layer {
  name: "mnist"   //数据层名称是mnist
  type: "Data"     //类型是数据
  top: "data"        //输出数据到两个Blob，data和label
  top: "label"
  include {
    phase: TRAIN
  }
  transform_param {
    scale: 0.00390625    //确保输出数据在[0,1)之间，所以乘以1/256
  }
  data_param {
    source: "examples/mnist/mnist_train_lmdb"    //从这里获得数据
    batch_size: 64        //每批大小是64
    backend: LMDB     
  }
}
layer {
  name: "mnist"
  type: "Data"
  top: "data"
  top: "label"
  include {
    phase: TEST
  }
  transform_param {
    scale: 0.00390625
  }
  data_param {
    source: "examples/mnist/mnist_test_lmdb"
    batch_size: 100    //每批大小是100
    backend: LMDB
  }
}

然后是第一个卷积层和下采样层：

layer {
  name: "conv1"
  type: "Convolution"
  bottom: "data"    //以下层传输过来的data Blob作为输入
  top: "conv1"    //这层数据输出到Blob conv1
  param {
    lr_mult: 1      //lr为learning rate，学习率
  } 
  param {
    lr_mult: 2      //bias的学习率是weight的两倍
  }
  convolution_param {
    num_output: 20     //输出有20个channel
    kernel_size: 5      //卷积核大小为5
    stride: 1             //卷积步长为1
    weight_filler {
      type: "xavier"      //使用xavier algorithm，根据输入和输出神经元的数目，自动确定初始化权重的范围
    }
    bias_filler {
      type: "constant"      //将偏置初始化为常数，且为0
    }
  }
}
layer {
  name: "pool1"
  type: "Pooling"      //层的类型是Pooling
  bottom: "conv1"     //输入是conv1 Blob
  top: "pool1"            //输出是pool1 Blob
  pooling_param {
    pool: MAX             //下采样方式是最大值采样
    kernel_size: 2       //在2*2的区域内选择最大值
    stride: 2                 //步长为2，防止区域有重叠
  }
}

第二个卷积层和下采样层也都是类似的，就不再赘述了，下面是两个全连接层：

layer {
  name: "ip1"
  type: "InnerProduct"      //Fully Connection Layer在caffe中也叫Inner Product
  bottom: "pool2"              //输入是pool2 Blob
  top: "ip1"                         //输出是ip1 Blob
  param {
    lr_mult: 1
  }
  param {
    lr_mult: 2
  }
  inner_product_param {
    num_output: 500        //输出的神经元个数为500
    weight_filler {
      type: "xavier"
    }
    bias_filler {
      type: "constant"
    }
  }
}
layer {
  name: "relu1" 
  type: "ReLU"
  bottom: "ip1"                //把输入和输出的Blob设为同一个名字，可以是对单个元素操作的relu节省存储空间
  top: "ip1"
}

然后是另一个全连接层，不过只有10个输出，对应10个数字。接下来就是Loss层（和Accuracy层，只在test阶段使用）：

layer {
  name: "loss"
  type: "SoftmaxWithLoss"
  bottom: "ip2"               //将全连接层的prediction和data层输出的label作为输入
  bottom: "label"
  top: "loss"
}

这一层没有进一步的输出，只计算损失函数值，当BP开始时将loss 报告出来。这个网络的定义就到此结束了。

此外，还有一点需要注意的是，当如下的格式出现时，

layer {
  // ...layer definition...
  include: { phase: TRAIN }
}

说明这一层只在TRAIN阶段出现在网络中，当处在TEST阶段时，这一层不出现在网络中。没有这个标志的层始终出现在网络当中。所以在以上的定义中，DATA层以不同的BATCH出现了两次，分别是TRAIN和TEST阶段。另外在测试阶段还有一个Accuracy层，每100次迭代就计算一下准确率。

再输入命令行：~/caffe-master$ vi ./examples/mnist/lenet_solver.prototxt，可以看到MNIST solver的配置情况：

The train/test net protocol buffer definition
net: "examples/mnist/lenet_train_test.prototxt"
# test_iter specifies how many forward passes the test should carry out.
# In the case of MNIST, we have test batch size 100 and 100 test iterations,
# covering the full 10,000 testing images.
test_iter: 100
# Carry out testing every 500 training iterations.
test_interval: 500
# The base learning rate, momentum and the weight decay of the network.
base_lr: 0.01
momentum: 0.9
weight_decay: 0.0005
# The learning rate policy
lr_policy: "inv"
gamma: 0.0001
power: 0.75
# Display every 100 iterations
display: 100
# The maximum number of iterations
max_iter: 10000
# snapshot intermediate results
snapshot: 5000
snapshot_prefix: "examples/mnist/lenet"
# solver mode: CPU or GPU
solver_mode: GPU

$ vi examples/mnist/lenet_solver.prototxt # 设置solver_mode: CPU

这里可以看到网络训练的配置，每批次训练100张图片，共100批次10000张图片，基础的学习率是0.1，使用GPU计算。因为这里的训练量较小，所以GPU的速度优势还看不太出来，如果在大一些的网络和训练集中，GPU的速度优势会更加明显

最后输入训练：

./examples/mnist/train_lenet.sh

就正式开始了训练和测试，正常情况下像MNIST这个级别的数据量应该几分钟就可以训练完。截取最后几行：

运行结果保存在了lenet_iter_10000.solverstate文件中。