基于Python实现的手写数字识别系统源码+全部数据.zip

import tensorflow as tf from tensorflow.examples.tutorials.mnist import input_data import mnist_inference import os # 配置神经网络的参数 BATCH_SIZE = 100 LEARNING_RATE_BASE = 0.8 LEARNING_RATE_DECAY = 0.99 REGULARIZATION_RATE = 0.0001 TRAINING_STEPS = 30000 MOVING_AVERAGE_DECAY = 0.99 # 模型保存的路径和文件名 MODEL_SAVE_PATH = "MNIST_model/" MODEL_NAME = "mnist_model" def train(mnist): # 定义输入输出placeholder x = tf.placeholder(tf.float32, [None, mnist_inference.INPUT_NODE], name='x-input') y_ = tf.placeholder(tf.float32, [None, mnist_inference.OUTPUT_NODE], name='y-input') regularizer = tf.contrib.layers.l2_regularizer(REGULARIZATION_RATE) # 使用mnist_inference.py文件中定义的前向传播的过程。 y = mnist_inference.inference(x, regularizer) global_step = tf.Variable(0, trainable=False) # 定义损失函数、学习率、滑动平均操作以及训练过程 variable_averages = tf.train.ExponentialMovingAverage(MOVING_AVERAGE_DECAY, global_step) variables_averages_op = variable_averages.apply(tf.trainable_variables()) cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=y, labels=tf.argmax(y_, 1)) cross_entropy_mean = tf.reduce_mean(cross_entropy) loss = cross_entropy_mean + tf.add_n(tf.get_collection('losses')) learning_rate = tf.train.exponential_decay( LEARNING_RATE_BASE, global_step, mnist.train.num_examples / BATCH_SIZE, LEARNING_RATE_DECAY, staircase=True) train_step = tf.train.GradientDescentOptimizer(learning_rate).minimize(loss, global_step=global_step) with tf.control_dependencies([train_step, variables_averages_op]): train_op = tf.no_op(name='train') # 使用tf.train.Saver()类保存模型 saver = tf.train.Saver() with tf.Session() as sess: # 初始化所有变量 tf.global_variables_initializer().run() for i in range(TRAINING_STEPS): xs, ys = mnist.train.next_batch(BATCH_SIZE) _, loss_value, step = sess.run([train_op, loss, global_step], feed_dict={x: xs, y_: ys}) if i % 1000 == 0: # 输出当前的训练情况，损失函数的大小 print("After %d training step(s), loss on training batch is %g." % (step, loss_value)) saver.save(sess, os.path.join(MODEL_SAVE_PATH, MODEL_NAME), global_step=global_step) saver.save(sess, os.path.join(MODEL_SAVE_PATH, MODEL_NAME), global_step=global_step) def main(argv=None): mnist = input_data.read_data_sets("../../../datasets/MNIST_data", one_hot=True) train(mnist) if __name__ == '__main__': tf.app.run()