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import tensorflow as tf
import numpy as np
import input_data
mnist = input_data.read_data_sets('data/', one_hot=True)
print("MNIST ready")
n_input = 784 # 28*28的灰度图，像素个数784
n_output = 10 # 是10分类问题
# 权重项
weights = {
# conv1,参数[3, 3, 1, 32]分别指定了filter的h、w、所连接输入的维度、filter的个数即产生特征图个数
'wc1': tf.Variable(tf.random_normal([3, 3, 1, 32], stddev=0.1)),
# conv2，这里参数3，3同上，32是当前连接的深度是32，即前面特征图的个数，64为输出的特征图的个数
'wc2': tf.Variable(tf.random_normal([3, 3, 32, 64], stddev=0.1)),
# fc1，将特征图转换为向量，1024由自己定义
'wd1': tf.Variable(tf.random_normal([7*7*64, 1024], stddev=0.1)),
# fc2，做10分类任务，前面连1024，输出10分类
'wd2': tf.Variable(tf.random_normal([1024, n_output], stddev=0.1))
}
"""
特征图大小计算：
f_w = (w-f+2*pad)/s + 1 = (28-3+2*1)/1 + 1 = 28 # 说明经过卷积层并没有改变图片的大小
f_h = (h-f+2*pad)/s + 1 = (28-3+2*1)/1 + 1 = 28
# 特征图的大小是经过池化层后改变的
第一次pooling后28*28变为14*14
第二次pooling后14*14变为7*7，即最终是一个7*7*64的特征图
"""
# 偏置项
biases = {
'bc1': tf.Variable(tf.random_normal([32], stddev=0.1)), # conv1，对应32个特征图
'bc2': tf.Variable(tf.random_normal([64], stddev=0.1)), # conv2，对应64个特征图
'bd1': tf.Variable(tf.random_normal([1024], stddev=0.1)), # fc1，对应1024个向量
'bd2': tf.Variable(tf.random_normal([n_output], stddev=0.1)) # fc2，对应10个输出
}
def conv_basic(_input, _w, _b, _keep_prob):
# INPUT
# 对图像做预处理，转换为tf支持的格式，即[n, h, w, c],-1是确定好其它3维后，让tf去推断剩下的1维
_input_r = tf.reshape(_input, shape=[-1, 28, 28, 1])
# CONV LAYER 1
_conv1 = tf.nn.conv2d(_input_r, _w['wc1'], strides=[1, 1, 1, 1], padding='SAME')
# [1, 1, 1, 1]分别代表batch_size、h、w、c的stride
# padding有两种选择：'SAME'（窗口滑动时，像素不够会自动补0）或'VALID'（不够就跳过）两种选择
_conv1 = tf.nn.relu(tf.nn.bias_add(_conv1, _b['bc1'])) # 卷积层后连激活函数
# 最大值池化，[1, 2, 2, 1]其中1,1对应batch_size和channel，2,2对应2*2的池化
_pool1 = tf.nn.max_pool(_conv1, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME')
# 随机杀死一些神经元,_keepratio为保留神经元比例，如0.6
_pool_dr1 = tf.nn.dropout(_pool1, _keep_prob)
# CONV LAYER 2
_conv2 = tf.nn.conv2d(_pool_dr1, _w['wc2'], strides=[1, 1, 1, 1], padding='SAME')
_conv2 = tf.nn.relu(tf.nn.bias_add(_conv2, _b['bc2']))
_pool2 = tf.nn.max_pool(_conv2, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME')
_pool_dr2 = tf.nn.dropout(_pool2, _keep_prob) # dropout
# VECTORIZE向量化
# 定义全连接层的输入，把pool2的输出做一个reshape，变为向量的形式
_densel = tf.reshape(_pool_dr2, [-1, _w['wd1'].get_shape().as_list()[0]])
# FULLY CONNECTED LAYER 1
_fc1 = tf.nn.relu(tf.add(tf.matmul(_densel, _w['wd1']), _b['bd1'])) # w*x+b，再通过relu
_fc_dr1 = tf.nn.dropout(_fc1, _keep_prob) # dropout
# FULLY CONNECTED LAYER 2
_out = tf.add(tf.matmul(_fc_dr1, _w['wd2']), _b['bd2']) # w*x+b，得到结果
# RETURN
out = {'input_r': _input_r, 'conv1': _conv1, 'pool1': _pool1, 'pool_dr1': _pool_dr1,
'conv2': _conv2, 'pool2': _pool2, 'pool_dr2': _pool_dr2, 'densel': _densel,
'fc1': _fc1, 'fc_dr1': _fc_dr1, 'out': _out
}
return out
print("CNN READY")
x = tf.placeholder(tf.float32, [None, n_input]) # 用placeholder先占地方，样本个数不确定为None
y = tf.placeholder(tf.float32, [None, n_output]) # 用placeholder先占地方，样本个数不确定为None
keep_prob = tf.placeholder(tf.float32)
_pred = conv_basic(x, weights, biases, keep_prob)['out'] # 前向传播的预测值
cost = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(_pred, y)) # 交叉熵损失函数
optm = tf.train.AdamOptimizer(0.001).minimize(cost) # 梯度下降优化器
_corr = tf.equal(tf.argmax(_pred, 1), tf.argmax(y, 1)) # 对比预测值索引和实际label索引，相同返回True，不同返回False
accr = tf.reduce_mean(tf.cast(_corr, tf.float32)) # 将True或False转换为1或0,并对所有的判断结果求均值
init = tf.global_variables_initializer()
print("FUNCTIONS READY")
# 上面神经网络结构定义好之后，下面定义一些超参数
training_epochs = 1000 # 所有样本迭代1000次
batch_size = 100 # 每进行一次迭代选择100个样本
display_step = 1
# LAUNCH THE GRAPH
sess = tf.Session() # 定义一个Session
sess.run(init) # 在sess里run一下初始化操作
# OPTIMIZE
for epoch in range(training_epochs):
avg_cost = 0.
total_batch = int(mnist.train.num_examples/batch_size)
for i in range(total_batch):
batch_xs, batch_ys = mnist.train.next_batch(batch_size) # 逐个batch的去取数据
sess.run(optm, feed_dict={x: batch_xs, y: batch_ys, keep_prob:0.5})
avg_cost += sess.run(cost, feed_dict={x: batch_xs, y: batch_ys, keep_prob:1.0})/total_batch
if epoch % display_step == 0:
train_accuracy = sess.run(accr, feed_dict={x: batch_xs, y: batch_ys, keep_prob: 1.0})
test_accuracy = sess.run(accr, feed_dict={x: mnist.test.images, y: mnist.test.labels, keep_prob:1.0})
print("Epoch: %03d/%03d cost: %.9f TRAIN ACCURACY: %.3f TEST ACCURACY: %.3f"
% (epoch, training_epochs, avg_cost, train_accuracy, test_accuracy))
print("DONE")
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我用的显卡是GTX960，在跑这个卷积神经网络的时候，第一次filter分别设的是64和128，结果报蜜汁错误了，反正就是我显存不足，所以改成了32和64，让特征图少一点。所以，是让我换1080的意思喽
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I c:\tf_jenkins\home\workspace\release-win\device\gpu\os\windows\tensorflow\core\common_runtime\gpu\gpu_device.cc:885] Found device 0 with properties:
name: GeForce GTX 960
major: 5 minor: 2 memoryClockRate (GHz) 1.304
pciBusID 0000:01:00.0
Total memory: 4.00GiB
Free memory: 3.33GiB
I c:\tf_jenkins\home\workspace\release-win\device\gpu\os\windows\tensorflow\core\common_runtime\gpu\gpu_device.cc:906] DMA: 0
I c:\tf_jenkins\home\workspace\release-win\device\gpu\os\windows\tensorflow\core\common_runtime\gpu\gpu_device.cc:916] 0: Y
I c:\tf_jenkins\home\workspace\release-win\device\gpu\os\windows\tensorflow\core\common_runtime\gpu\gpu_device.cc:975] Creating TensorFlow device (/gpu:0) -> (device: 0, name: GeForce GTX 960, pci bus id: 0000:01:00.0)
W c:\tf_jenkins\home\workspace\release-win\device\gpu\os\windows\tensorflow\core\common_runtime\bfc_allocator.cc:217] Ran out of memory trying to allocate 2.59GiB. The caller indicates that this is not a failure, but may mean that there could be performance gains if more memory is available.
W c:\tf_jenkins\home\workspace\release-win\device\gpu\os\windows\tensorflow\core\common_runtime\bfc_allocator.cc:217] Ran out of memory trying to allocate 1.34GiB. The caller indicates that this is not a failure, but may mean that there could be performance gains if more memory is available.
W c:\tf_jenkins\home\workspace\release-win\device\gpu\os\windows\tensorflow\core\common_runtime\bfc_allocator.cc:217] Ran out of memory trying to allocate 2.10GiB. The caller indicates that this is not a failure, but may mean that there could be performance gains if more memory is available.
W c:\tf_jenkins\home\workspace\release-win\device\gpu\os\windows\tensorflow\core\common_runtime\bfc_allocator.cc:217] Ran out of memory trying to allocate 3.90GiB. The caller indicates that this is not a failure, but may mean that there could be performance gains if more memory is available.
Epoch: 000/1000 cost: 0.517761162 TRAIN ACCURACY: 0.970 TEST ACCURACY: 0.967
Epoch: 001/1000 cost: 0.093012387 TRAIN ACCURACY: 0.960 TEST ACCURACY: 0.979
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省略
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以上就是TensorFlow另一种程序风格实现卷积神经网络的详细内容，更多关于TensorFlow卷积神经网络的资料请关注服务器之家其它相关文章！
原文链接：https://blog.csdn.net/lwplwf/article/details/62237000