tensorflow安装（一）

安装：
(1)apt-get install python-pip python-dev；
(2)pip install –upgrade https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.8.0-cp27-none-linux_x86_64.whl;
HelloWorld：
import tensorflow as tf
hello=tf.constant(‘hello ‘)
sess=tf.Session()
print sess.run(hello)
a=tf.constant(10)
b=tf.constant(32)
print sess.run(a+b)
平面拟合三维点：
import tensorflow as tf
import numpy as np

x_data=np.float32(np.random.rand(2,100))
y_data=np.dot([0.100,0.200].x_data)+0.300

b=tf.Variable(tf.zeros([1]))
w=tf.Variable(tf.random_uniform([1,2],-1.0,1.0))
y=tf.matmul(W,x_data)+b

loss = tf.reduce_mean(tf.square(y - y_data))
optimizer = tf.train.GradientDescentOptimizer(0.5)
train = optimizer.minimize(loss)

init = tf.initialize_all_variables()

sess = tf.Session()
sess.run(init)

for step in xrange(0, 201):
sess.run(train)
if step % 20 == 0:
print step, sess.run(W), sess.run(b)

练习：tensorflow练习