import tensorflow as tf
from numpy.random import RandomState
batch_size = 8
w1 = tf.Variable(tf.random_normal([2, 3], stddev=1, seed=1))
w2 = tf.Variable(tf.random_normal([3, 1], stddev=1, seed=1))
x = tf.placeholder(tf.float32, shape=(None, 2), name="x-input")
y_ = tf.placeholder(tf.float32, shape=(None, 1), name="y-input")
a = tf.matmul(x, w1)
y = tf.matmul(a, w2)
#定义损失函数和反向传播的算法
cross_entropy = -tf.reduce_mean(
y_ * tf.log(tf.clip_by_value(y, 1e-10, 1.0)))
train_step = tf.train.AdadeltaOptimizer(0.001).minimize(cross_entropy)
#通过随机数生成一个模拟数据集
rdm = RandomState(1)
dataset_size = 128
X = rdm.rand(dataset_size, 2)
Y = [[int(x1+x2 < 1)] for (x1, x2) in X]
with tf.Session() as sess:
init_op = tf.global_variables_initializer()
sess.run(init_op)
print(sess.run(w1))
print(sess.run(w2))
#设定训练的轮数
STEPS = 5000
for i in range(STEPS):
#每次选取batch_size个样本进行训练