第一个Tensor Flow的例子程序

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’’’ 生成三维数据,用平面去拟合 ‘’’

import tensorflow as tf

import numpy as np

’'’使用 NumPy 生成假数据(phony data), 总共 100 个点.’’’

x_data = np.float32(np.random.rand(2, 100))

y_data = np.dot([0.100, 0.200], x_data) + 0.300

’'’构造一个线性模型’’’

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

’'’最小化方差’’’

loss = tf.reduce_mean(tf.square(y - y_data))

optimizer = tf.train.GradientDescentOptimizer(0.5)

train = optimizer.minimize(loss)

’'’初始化变量’’’

init = tf.initialize_all_variables()

’'’启动图 (graph)’’’

sess = tf.Session()

sess.run(init)

’'’拟合平面’’’

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

’'’得到最佳拟合结果 W: [[0.100 0.200]], b: [0.300]’’’