基于TensorFlow的多层感知机

最新推荐文章于 2024-09-29 17:00:04 发布

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最新推荐文章于 2024-09-29 17:00:04 发布

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分类专栏： TensorFlow

本文链接：https://blog.youkuaiyun.com/Explorer_Du/article/details/60592151

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本文介绍了一个使用TensorFlow实现的手写数字识别模型。该模型采用两层神经网络结构，通过Adagrad优化器进行训练，并在MNIST数据集上达到了较高的准确率。

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#-*-coding:utf-8 -*-
#数据的读取
from tensorflow.examples.tutorials.mnist import input_data
import tensorflow as tf
mnist = input_data.read_data_sets("MNIST_data/",one_hot = True)
sess = tf.InteractiveSession()
#参数的设置
in_units = 784
h1_units = 300
w1 = tf.Variable(tf.truncated_normal([in_units,h1_units],stddev = 0.1))
b1 = tf.Variable(tf.zeros([h1_units]))
w2 = tf.Variable(tf.zeros([h1_units,10])) 
b2 = tf.Variable(tf.zeros([10]))

x = tf.placeholder(tf.float32,[None,in_units])
keep_prob = tf.placeholder(tf.float32)

hidden1 = tf.nn.relu(tf.matmul(x,w1)+b1)
hidden1_drop = tf.nn.dropout(hidden1,keep_prob)
y = tf.nn.softmax(tf.matmul(hidden1_drop,w2)+b2)

y_ = tf.placeholder(tf.float32,[None,10])
cross_entropy = tf.reduce_mean(-tf.reduce_sum(y_*tf.log(y),reduction_indices = [1]))
train_step = tf.train.AdagradOptimizer(0.3).minimize(cross_entropy)

tf.global_variables_initializer().run()
for i in range(3000):
	batch_xs,batch_ys = mnist.train.next_batch(100)
	train_step.run({x:batch_xs,y_:batch_ys,keep_prob:0.75})

correct_prediction = tf.equal(tf.argmax(y,1),tf.argmax(y_,1))
accuracy = tf.reduce_mean(tf.cast(correct_prediction,tf.float32))
print(accuracy.eval({x:mnist.test.images,y_:mnist.test.labels,keep_prob:1.0}))