之前安装过 tensorflow 0.6，还没来得及玩就休假了。回来之后，tensorflow就已经是0.8了，支持分布式训练。于是着手先升级。系统里面之前装caffe，也装过很多tensorflow需要的库，所以一开始安装，各种需求 冲突还是有点头大。
Pip Install: Install TensorFlow on your machine, possibly upgrading previously installed Python packages. May impact existing Python programs on your machine.
Virtualenv Install: Install TensorFlow in its own directory, not impacting any existing Python programs on your machine.
Anaconda install: Install TensorFlow in its own environment for those running the Anaconda Python distribution. Does not impact existing Python programs on your machine.
Docker Install: Run TensorFlow in a Docker container isolated from all other programs on your machine.
安装方法 ： https://www.tensorflow.org/versions/r0.8/get_started/os_setup.html#overview
pip install升级到0.8后，发现运行程序很多问题，首先是glib 和 gcc版本过低的问题。 Centos 系统自带的glibc是2.12。按提示升级到2.15，发现还是不行，继续升级到2.17.
# LD_PRELOAD=/usr/lib64/libc-2.17.so rm /lib64/libc.so.6
# LD_PRELOAD=/lib64/libc-2.17.so ln -s /lib64/libc-2.17.so /lib64/libc.so.6
# strings /usr/lib64/libc.so.6|grep GLIBC
......
GLIBC_2.16
GLIBC_2.17
GLIBC_PRIVATE
然后升级gcc，这个过程需要比较小心，如果失败了，那么很多指令都不能使用了。升级后
# ln /usr/lib64/libstdc++.so.6.0.21 /usr/lib64/libstdc++.so.6
# strings /usr/local/lib64/libstdc++.so.6|grep GLIBCXX
......
GLIBCXX_3.4.16
GLIBCXX_3.4.17
GLIBCXX_3.4.18
GLIBCXX_3.4.19
GLIBCXX_3.4.20
GLIBCXX_3.4.21
GLIBCXX_FORCE_NEW
然后是安装的protobuf无法识别 ：ImportError: No module named protobuf
protobuf安装是成功的，python模块安装出现问题。重装也于事无补，然后选择了virtualenv install的方法，瞬间解决所有问题。
# virtualenv --system-site-packages ~/tensorflow
# source ~/tensorflow/bin/activate
# pip install --ignore-installed --upgrade https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.8.0-cp27-none-linux_x86_64.whl
Collecting tensorflow==0.8.0 from https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.8.0-cp27-none-linux_x86_64.whl
/root/tensorflow/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:318:
SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not
available on this platform. This may cause the server to present an incorrect TLS certificate, which an cause
validation failures. You can upgrade to a newer version of Python to solve this. For more information, see
https://urllib3.readthedocs.org/en/latest/security.html#snimissingwarning.
SNIMissingWarning
/root/tensorflow/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122:
InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL
appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve
this. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
InsecurePlatformWarningUsing cached https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.8.0-cp27-none-linux_x86_64.whl
Collecting numpy>=1.8.2 (from tensorflow==0.8.0)
/root/tensorflow/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122:
InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL
appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve
this. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
InsecurePlatformWarning
Using cached numpy-1.11.0-cp27-cp27mu-manylinux1_x86_64.whl
Collecting six>=1.10.0 (from tensorflow==0.8.0)
Downloading six-1.10.0-py2.py3-none-any.whl
Collecting protobuf==3.0.0b2 (from tensorflow==0.8.0)
Using cached protobuf-3.0.0b2-py2.py3-none-any.whl
Collecting wheel (from tensorflow==0.8.0)
Using cached wheel-0.29.0-py2.py3-none-any.whl
Collecting setuptools (from protobuf==3.0.0b2->tensorflow==0.8.0)
Using cached setuptools-23.0.0-py2.py3-none-any.whl
Installing collected packages: numpy, six, setuptools, protobuf, wheel, tensorflow
Successfully installed numpy-1.11.0 protobuf-3.0.0a2 setuptools-23.0.0 six-1.10.0 tensorflow-0.8.0 wheel-0.29.0
python -c 'import os; import inspect; import tensorflow; print(os.path.dirname(inspect.getfile(tensorflow)))'
/root/tensorflow/lib/python2.7/site-packages/tensorflow
安装完后，先用命令行测试一下
$ python
...
>>> import tensorflow as tf
>>> hello = tf.constant('Hello, TensorFlow!')
>>> sess = tf.Session()
>>> print(sess.run(hello))
Hello, TensorFlow!
>>> a = tf.constant(10)
>>> b = tf.constant(32)
>>> print(sess.run(a + b))
42
>>>
然后再跑一个实例model
#cd /root/tensorflow/lib/python2.7/site-packages/tensorflow/models/image/mnist
#python convolutional.py
Extracting data/train-images-idx3-ubyte.gz
Extracting data/train-labels-idx1-ubyte.gz
Extracting data/t10k-images-idx3-ubyte.gz
Extracting data/t10k-labels-idx1-ubyte.gz
Initialized!
Step 0 (epoch 0.00), 2.9 ms
Minibatch loss: 12.054, learning rate: 0.010000
Minibatch error: 90.6%
Validation error: 84.6%
......
#deactivate