void32/installing_caffe.md

## installing_caffe.md

      
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              installing_caffe.md
            
          
    This is a guide on how to install Caffe for Ubuntu 16.04 and above, without GPU support (No CUDA required).

Prerequisites:

OpenCV

sudo apt-get install libopencv-dev python-opencv
OpenBLAS OR Atlas

OpenBLAS

sudo apt-get install libopenblas-dev
Atlas

sudo apt-get install libatlas-base-dev
Boost

sudo apt-get install libboost-all-dev
Protobuf (USING PIP)

sudo pip install protobuf
If you don't have pip yet, install it using the following commands:

sudo apt-get install python-pip python-dev build-essential

sudo pip install --upgrade pip


General Dependencies

sudo apt-get install libprotobuf-dev libleveldb-dev libsnappy-dev libopencv-dev libhdf5-serial-dev protobuf-compiler 

sudo apt-get install the python-dev 

sudo apt-get install libgflags-dev libgoogle-glog-dev liblmdb-dev 


Getting Caffe

git clone https://github.com/BVLC/caffe

You will now find the caffe folder in your Home directory.
We have to make a copy of Makefile.config.example, which we generally name as, Makefile.config to which we can make changes based on our system settings.
cd caffe
cp Makefile.config.example Makefile.config


Making Changes In Makefile.config

Make sure you are still in the caffe directory, then use this command to open Makefile.config
gedit Makefile.config 

Note- The following line numbers may vary.


On line 8,
uncomment CPU_ONLY := 1


On Line 21, uncomment OPENCV_VERSION := 3 if you're using OpenCV 3 or above.
If you aren't sure, try this in another terminal


$ python
>>> import cv2
>>> cv2.__version__
'3.0.0'


On line 25,
uncomment CUSTOM_CXX := g++


On line 50,
set BLAS := open if you've installed OpenBLAS, or let it be the default BLAS := atlas if you've installed Atlas.


On line 94, change


INCLUDE_DIRS := $(PYTHON_INCLUDE) /usr/local/include

to
INCLUDE_DIRS := $(PYTHON_INCLUDE) /usr/local/include  /usr/include/hdf5/serial 


On line 95, change

LIBRARY_DIRS := $(PYTHON_LIB) /usr/local/lib


to
LIBRARY_DIRS := $(PYTHON_LIB) /usr/local/lib  /usr/lib/x86_64-linux-gnu/hdf5/serial


This should resolve hdf5 errors when running make
Now within the caffe directory, run the following one after the other
make all
make test
make runtest

These should run smoothly without any errors. If you do however, encounter errors, refer the ones at the end of this post or elsewhere to resolve them.
Make sure to REMOVE BUILD every time you resolve an error, and run those three commands again to rebuild.
This is VERY IMPORTANT, otherwise the errors will persist.
To remove build,
rm -rf ./build*/


Once all three run without errors, while in the caffe directory, type
make pycaffe

This will build a python wrapper. You will also find a python folder within the caffe folder now.
To use caffe within python, export its path as
 export PYTHONPATH=~/Home/_username_/caffe/python:$PYTHONPATH
Replace _username_ with the your username in the system.
Once you've done this, run the python terminal and import caffe
>>> import caffe
>>>

This, should work.
If it throws a 'module not found' error, check if it has been appended in pythonpath properly by typing
>>> import sys
>>> sys.path
['', '/home/nikita/caffe/python', '/home/nikita', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib
/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/home/nikita/.local/lib/python2.7/site-
packages']

If you see that the /home/_username_/caffe/python path, isn't there, then do
>>> sys.path.append('/Home/_username_/caffe/python')

Alternatively, just use
caffe/python

depending on whether your export is already under home/username
That's all there is to installing caffe.

Common Errors

OpenCV Errors

.
.
/usr/bin/ld: cannot find -lopencv_imgcodecs
/usr/bin/ld: cannot find -lopencv_videoio
collect2: error: ld returned 1 exit status

This usually happens when you've either forgotten to uncomment line 21 when you have OpenCV 3,
or if you haven't checked the version properly.
If you're using OpenCV < 3, this shouldn't be an error at all.
If it still shows on OpenCV >= 3.0, then in the Makefile ( NOT Makefile.config )
on line 181 (in my case), add libraries such that it looks like
LIBRARIES += glog gflags protobuf leveldb snappy \
  lmdb boost_system hdf5_hl hdf5 \
  opencv_core opencv_highgui opencv_imgproc opencv_imgcodecs


Also, make sure to rebuild!
OpenBLAS Errors

/usr/bin/ld: cannot find -lcblas
collect2: ld returned 1 exit status
make: *** [.build_release/lib/libcaffe.so] Error 1

This happens if you've not installed OpenBLAS properly, or if you've set

BLAS := open when you have only Atlas installed. It may sound silly, but 'to err is human'.
If it persists after rebuild,
install Atlas instead and change to BLAS := atlas