这篇文章主要介绍TensorFlow tf.nn.conv2d如何实现卷积的方式，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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介绍
惯例先展示函数：
tf.nn.conv2d(input, filter, strides, padding, use_cudnn_on_gpu=None, name=None)
除去name参数用以指定该操作的name，与方法有关的一共五个参数：
input：
指需要做卷积的输入图像，它要求是一个Tensor，具有[batch, in_height, in_width, in_channels]这样的shape，具体含义是[训练时一个batch的图片数量, 图片高度, 图片宽度, 图像通道数]，注意这是一个4维的Tensor，要求类型为float32和float64其中之一
filter：
相当于CNN中的卷积核，它要求是一个Tensor，具有[filter_height, filter_width, in_channels, out_channels]这样的shape，具体含义是[卷积核的高度，卷积核的宽度，图像通道数，卷积核个数]，要求类型与参数input相同，有一个地方需要注意，第三维in_channels，就是参数input的第四维
strides：卷积时在图像每一维的步长，这是一个一维的向量，长度4
padding：
string类型的量，只能是”SAME”,”VALID”其中之一，这个值决定了不同的卷积方式（后面会介绍）
use_cudnn_on_gpu：
bool类型，是否使用cudnn加速，默认为true
结果返回一个Tensor，这个输出，就是我们常说的feature map
实验
那么TensorFlow的卷积具体是怎样实现的呢，用一些例子去解释它：
1.考虑一种最简单的情况，现在有一张3×3单通道的图像（对应的shape：[1，3，3，1]），用一个1×1的卷积核（对应的shape：[1，1，1，1]）去做卷积，最后会得到一张3×3的feature map
2.增加图片的通道数，使用一张3×3五通道的图像（对应的shape：[1，3，3，5]），用一个1×1的卷积核（对应的shape：[1，1，1，1]）去做卷积，仍然是一张3×3的feature map，这就相当于每一个像素点，卷积核都与该像素点的每一个通道做点积
input = tf.Variable(tf.random_normal([1,3,3,5]))
filter = tf.Variable(tf.random_normal([1,1,5,1]))
op = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='VALID')
3.把卷积核扩大，现在用3×3的卷积核做卷积，最后的输出是一个值，相当于情况2的feature map所有像素点的值求和
input = tf.Variable(tf.random_normal([1,3,3,5]))
filter = tf.Variable(tf.random_normal([3,3,5,1]))
op = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='VALID')
4.使用更大的图片将情况2的图片扩大到5×5，仍然是3×3的卷积核，令步长为1，输出3×3的feature map
.....
.xxx.
.xxx.
.xxx.
.....
5.上面我们一直令参数padding的值为‘VALID'，当其为‘SAME'时，表示卷积核可以停留在图像边缘，如下，输出5×5的feature map
input = tf.Variable(tf.random_normal([1,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,1]))
op = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='SAME')
xxxxx
xxxxx
xxxxx
xxxxx
xxxxx
6.如果卷积核有多个
input = tf.Variable(tf.random_normal([1,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,7]))
op = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='SAME')
此时输出7张5×5的feature map
7.步长不为1的情况，文档里说了对于图片，因为只有两维，通常strides取[1，stride，stride，1]
input = tf.Variable(tf.random_normal([1,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,7]))
op = tf.nn.conv2d(input, filter, strides=[1, 2, 2, 1], padding='SAME')
此时，输出7张3×3的feature map
x.x.x
.....
x.x.x
.....
x.x.x
8.如果batch值不为1，同时输入10张图
input = tf.Variable(tf.random_normal([10,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,7]))
op = tf.nn.conv2d(input, filter, strides=[1, 2, 2, 1], padding='SAME')
每张图，都有7张3×3的feature map，输出的shape就是[10，3，3，7]
代码清单
最后，把程序总结一下：
import tensorflow as tf
#case 2
input = tf.Variable(tf.random_normal([1,3,3,5]))
filter = tf.Variable(tf.random_normal([1,1,5,1]))
op2 = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='VALID')
#case 3
input = tf.Variable(tf.random_normal([1,3,3,5]))
filter = tf.Variable(tf.random_normal([3,3,5,1]))
op3 = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='VALID')
#case 4
input = tf.Variable(tf.random_normal([1,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,1]))
op4 = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='VALID')
#case 5
input = tf.Variable(tf.random_normal([1,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,1]))
op5 = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='SAME')
#case 6
input = tf.Variable(tf.random_normal([1,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,7]))
op6 = tf.nn.conv2d(input, filter, strides=[1, 1, 1, 1], padding='SAME')
#case 7
input = tf.Variable(tf.random_normal([1,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,7]))
op7 = tf.nn.conv2d(input, filter, strides=[1, 2, 2, 1], padding='SAME')
#case 8
input = tf.Variable(tf.random_normal([10,5,5,5]))
filter = tf.Variable(tf.random_normal([3,3,5,7]))
op8 = tf.nn.conv2d(input, filter, strides=[1, 2, 2, 1], padding='SAME')
init = tf.initialize_all_variables()
with tf.Session() as sess:
sess.run(init)
print("case 2")
print(sess.run(op2))
print("case 3")
print(sess.run(op3))
print("case 4")
print(sess.run(op4))
print("case 5")
print(sess.run(op5))
print("case 6")
print(sess.run(op6))
print("case 7")
print(sess.run(op7))
print("case 8")
print(sess.run(op8))因为是随机初始化，我的结果是这样的：
case 2
[[[[-0.64064658]
[-1.82183945]
[-2.63191342]]
[[ 8.05008984]
[ 1.66023612]
[ 2.53465152]]
[[-3.51703644]
[-5.92647743]
[ 0.55595356]]]]
case 3
[[[[ 10.53139973]]]]
case 4
[[[[ 10.45460224]
[ 6.23760509]
[ 4.97157574]]
[[ 3.05653667]
[-11.43907833]
[ -2.05077457]]
[[ -7.48340607]
[ -0.90697062]
[ 3.27171206]]]]
case 5
[[[[ 5.30279875]
[ -2.75329947]
[ 5.62432575]
[-10.24609661]
[ 0.12603235]]
[[ 0.2113893 ]
[ 1.73748684]
[ -3.04372549]
[ -7.2625494 ]
[-12.76445198]]
[[ -1.57414591]
[ -3.39802694]
[ -6.01582575]
[ -1.73042905]
[ -3.07183361]]
[[ 1.41795194]
[ -2.02815866]
[-17.08983231]
[ 11.98958111]
[ 2.44879103]]
[[ 0.29902667]
[ -3.19712877]
[ -2.84978414]
[ -2.71143317]
[ 5.99366283]]]]
case 6
[[[[ 12.02504349 4.35077286 2.67207813 5.77893162 6.98221684
-0.96858567 -8.1147871 ]
[ -0.02988982 -2.52141953 15.24755192 6.39476395 -4.36355495
-2.34515095 5.55743504]
[ -2.74448752 -1.62703776 -6.84849405 10.12248802 3.7408421
4.71439075 6.13722801]
[ 0.82365227 -1.00546622 -3.29460764 5.12690163 -0.75699937
-2.60097408 -8.33882809]
[ 0.76171923 -0.86230004 -6.30558443 -5.58426857 2.70478535
8.98232937 -2.45504045]]
[[ 3.13419819 -13.96483231 0.42031103 2.97559547 6.86646557
-3.44916964 -0.10199898]
[ 11.65359879 -5.2145977 4.28352737 2.68335319 3.21993709
-6.77338028 8.08918095]
[ 0.91533852 -0.31835344 -1.06122255 -9.11237717 5.05267143
5.6913228 -5.23855162]
[ -0.58775592 -5.03531456 14.70254898 9.78966522 -11.00562763
-4.08925819 -3.29650426]
[ -2.23447251 -0.18028721 -4.80610704 11.2093544 -6.72472
-2.67547607 1.68422937]]
[[ -3.40548897 -9.70355129 -1.05640507 -2.55293012 -2.78455877
-15.05377483 -4.16571808]
[ 13.66925812 2.87588191 8.29056358 6.71941566 2.56558466
10.10329056 2.88392687]
[ -6.30473804 -3.3073864 12.43273926 -0.66088223 2.94875336
0.06056046 -2.78857946]
[ -7.14735603 -1.44281793 3.3629775 -7.87305021 2.00383091
-2.50426936 -6.93097973]
[ -3.15817571 1.85821593 0.60049552 -0.43315536 -4.43284273
0.54264796 1.54882073]]
[[ 2.19440389 -0.21308756 -4.35629082 -3.62100363 -0.08513772
-0.80940366 7.57606506]
[ -2.65713739 0.45524287 -16.04298019 -5.19629049 -0.63200498
1.13256514 -6.70045137]
[ 8.00792599 4.09538221 -6.16250181 8.35843849 -4.25959206
-1.5945878 -7.60996151]
[ 8.56787586 5.85663748 -4.38656425 0.12728286 -6.53928804
2.3200655 9.47253895]
[ -6.62967777 2.88872099 -2.76913023 -0.86287498 -1.4262073
-6.59967232 5.97229099]]
[[ -3.59423327 4.60458899 -5.08300591 1.32078576 3.27156973
0.5302844 -5.27635145]
[ -0.87793881 1.79624665 1.66793108 -4.70763969 -2.87593603
-1.26820421 -7.72825718]
[ -1.49699068 -3.40959787 -1.21225107 -1.11641395 -8.50123024
-0.59399474 3.18010235]
[ -4.4249506 -0.73349547 -1.49064219 -6.09967899 5.18624878
-3.80284953 -0.55285597]
[ -1.42934585 2.76053572 -5.19795799 0.83952439 -0.15203482
0.28564462 2.66513705]]]]
case 7
[[[[ 2.66223097 2.64498258 -2.93302107 3.50935125 4.62247562
2.04241085 -2.65325522]
[ -0.03272867 -1.00103927 -4.3691597 2.16724801 7.75251007
-4.6788125 -0.89318085]
[ 4.74175072 -0.80443329 -1.02710629 -6.68772554 4.57605314
-3.72993755 4.79951382]]
[[ 5.249547 8.92288399 7.10703182 -9.10498428 -7.43814278
-8.69616318 1.78862095]
[ 7.53669024 -14.52316284 -2.55870199 -1.11976743 3.81035042
2.45559502 -2.35436153]
[ 3.93275881 5.11939669 -4.7114296 -11.96386623 2.11866689
0.57433248 -7.19815397]]
[[ 0.25111672 1.40801668 1.28818977 -2.64093828 0.98182392
3.69512987 4.78833389]
[ 0.30391204 -10.26406097 6.05877018 -6.04775047 8.95922089
0.80235004 -5.4520669 ]
[ -7.24697018 -2.33498096 -10.20039558 -1.24307609 3.99351597
-8.1029129 2.44411373]]]]
case 8
[[[[ -6.84037447e+00 1.33321762e-01 -5.09891272e+00 5.55682087e+00
8.22002888e+00 -4.94586229e-02 4.19012117e+00]
[ 6.79884481e+00 1.21652853e+00 -5.69557810e+00 -1.33555794e+00
3.24849486e-01 4.88868570e+00 -3.90220714e+00]
[ -3.53190374e+00 -4.11765718e+00 4.54340839e+00 1.85549557e+00
-3.38682461e+00 2.62719369e+00 -4.98658371e+00]]
[[ -9.86354351e+00 -6.76713943e+00 3.62617874e+00 -6.16720629e+00
1.96754158e+00 -4.54203081e+00 -1.37485743e+00]
[ -1.76783955e+00 2.35163045e+00 -2.21175838e+00 3.83091879e+00
3.16964531e+00 -7.58307219e+00 4.71943617e+00]
[ 1.20776439e+00 4.86006308e+00 1.04233503e+01 -7.82327271e+00
5.39195156e+00 -6.31672382e+00 1.35577369e+00]]
[[ -3.65947580e+00 -1.98961139e+00 7.53771305e+00 2.79224634e-01
-2.90050888e+00 -3.57466817e+00 -6.33232594e-01]
[ 5.89931488e-01 2.83219159e-01 -1.65850735e+00 -6.45545387e+00
-1.17044592e+00 1.40343285e+00 5.74970901e-01]
[ -8.58810043e+00 -1.25172977e+01 6.84177876e-01 3.80004168e+00
-1.54420209e+00 -3.32161427e+00 -1.05423713e+00]]]
[[[ -4.82677078e+00 3.11167526e+00 -4.32694483e+00 -4.77198696e+00
2.32186103e+00 1.65402293e-01 -5.32707453e+00]
[ 3.91779566e+00 6.27949667e+00 2.32975650e+00 -1.06336937e+01
4.44044876e+00 8.08288479e+00 -5.83346319e+00]
[ -2.82141399e+00 -9.16103745e+00 6.98908520e+00 -5.66505909e+00
-2.11039782e+00 2.27499461e+00 -5.74120235e+00]]
[[ 6.71680808e-01 -4.01104212e+00 -4.61760712e+00 1.02667952e+01
-8.21200657e+00 -8.57054043e+00 1.71461976e+00]
[ 2.40794683e+00 -2.63071585e+00 9.68963623e+00 -4.51778412e+00
-3.91073084e+00 -5.91874409e+00 9.96273613e+00]
[ 2.67705870e+00 2.85607010e-01 2.45853162e+00 4.44810390e+00
-2.11300468e+00 -5.77583075e+00 2.83322239e+00]]
[[ -8.21949577e+00 -7.57754421e+00 3.93484974e+00 2.26189137e+00
-3.49395227e+00 -6.40283823e+00 -6.00450039e-01]
[ 2.95964479e-02 -1.19976890e+00 5.38537979e+00 4.62369967e+00
3.89780998e+00 -6.36872959e+00 7.12107182e+00]
[ -8.85006547e-01 1.92706418e+00 3.26668215e+00 2.03566647e+00
1.44209075e+00 -6.48463774e+00 -8.33671093e-02]]]
[[[ -2.64583921e+00 3.86011934e+00 4.18198538e+00 3.50338411e+00
6.35944796e+00 -4.28423309e+00 4.87355423e+00]
[ 4.42271233e+00 3.92883778e+00 -5.59371090e+00 4.98251200e+00
-3.45068884e+00 2.91921115e+00 1.03779554e+00]
[ 1.36162388e+00 -1.06808968e+01 -3.92534947e+00 1.85111761e-01
-4.87255526e+00 1.66666222e+01 -1.04918976e+01]]
[[ -4.34632540e+00 1.74614882e+00 -2.89012527e+00 -8.74067783e+00
5.06610107e+00 1.24989772e+00 -3.06433105e+00]
[ 2.49973416e+00 2.14041996e+00 -4.71008825e+00 7.39326143e+00
3.94770741e+00 8.23049164e+00 -1.67046225e+00]
[ -2.94665837e+00 -4.58543825e+00 7.21219683e+00 1.09780006e+01
5.17258358e+00 7.90257788e+00 -2.13929534e+00]]
[[ 4.20402241e+00 -2.98926830e+00 -3.89006615e-01 -8.16001511e+00
-2.38355541e+00 1.42584383e+00 -5.46632290e+00]
[ 5.52395058e+00 5.09255171e+00 -1.08742390e+01 -4.96262169e+00
-1.35298109e+00 3.65663052e-01 -3.40589857e+00]
[ -6.95647061e-01 -4.12855625e+00 2.66609401e-01 -9.39565372e+00
-3.85058141e+00 2.51248240e-01 -5.77149725e+00]]]
[[[ 1.22103825e+01 5.72040796e+00 -3.56989503e+00 -1.02248180e+00
-5.20942688e-01 7.15008640e+00 3.43482435e-01]
[ 6.01409674e+00 -1.59511256e+00 -6.48080063e+00 -1.82889538e+01
-1.03537569e+01 -1.48270035e+01 -5.26662111e+00]
[ 5.51758146e+00 -2.91831636e+00 3.75461340e-01 -9.23893452e-02
-9.22101116e+00 7.16952372e+00 -6.86479330e-01]]
[[ -3.03645611e+00 6.68620300e+00 -3.31973934e+00 -4.91346550e+00
9.20719814e+00 -2.55552864e+00 -2.16087699e-02]
[ -3.02986956e+00 -1.29726543e+01 1.53023469e+00 -8.19733238e+00
5.68085670e+00 -1.72856820e+00 -4.69369221e+00]
[ -6.67176056e+00 8.76355553e+00 2.18996063e-01 -4.38777208e+00
-6.35764122e-01 -1.37812555e+00 -4.41474581e+00]]
[[ 2.25345469e+00 1.02142305e+01 -1.71714854e+00 -5.29060185e-01
2.27982092e+00 -8.75302982e+00 7.13998675e-02]
[ -6.67547846e+00 3.67722750e+00 -3.44172812e+00 5.69674826e+00
-2.28723526e+00 5.92991543e+00 5.53608060e-01]
[ -1.01174891e-01 -2.73731589e+00 -4.06187654e-01 6.54158068e+00
2.59603882e+00 2.99202776e+00 -2.22350287e+00]]]
[[[ -1.81271315e+00 2.47674489e+00 -2.90284491e+00 1.34291325e+01
7.69864845e+00 -1.27134466e+00 3.02233839e+00]
[ -2.08135307e-01 1.03206539e+00 1.90775347e+00 9.01517391e+00
-3.52140331e+00 9.05393791e+00 -9.12732124e-01]
[ 1.12128162e+00 5.98179293e+00 -2.27206993e+00 -5.21281779e-01
6.20835352e+00 3.73474598e+00 1.18961644e+00]]
[[ 3.17242837e+00 -6.00571585e+00 2.37661076e+00 -5.64483738e+00
-6.45412731e+00 8.75251675e+00 7.33790398e-02]
[ 3.08957529e+00 -1.06855690e-01 -5.16810894e-01 -9.41085911e+00
8.23878098e+00 6.79738426e+00 -1.23478663e+00]
[ -9.20640087e+00 -6.82801771e+00 -5.96975613e+00 7.61030674e-01
-4.35995817e+00 -3.54818010e+00 -2.56281614e+00]]
[[ 4.69872713e-01 8.36402321e+00 5.37103415e-01 -1.68033957e-01
-3.21731424e+00 -7.34270859e+00 -3.14253521e+00]
[ 6.69656086e+00 -5.27954197e+00 -8.57314682e+00 4.84328842e+00
-2.96387672e+00 2.47114658e+00 2.85376692e+00]
[ -7.86032295e+00 -7.18845367e+00 -3.27161223e-01 9.27330971e+00
-6.14093494e+00 -4.49041557e+00 3.47160912e+00]]]
[[[ -1.89188433e+00 5.43082857e+00 6.04252160e-01 6.92894220e+00
8.59178162e+00 1.02003086e+00 5.31300211e+00]
[ -8.97491455e-01 6.52438164e+00 -4.43710327e+00 7.10509634e+00
8.84234428e+00 3.08552694e+00 2.78152227e+00]
[ -9.40537453e-02 2.34666920e+00 -5.57496691e+00 -8.62346458e+00
-1.32807600e+00 -8.12027454e-02 -9.00946975e-01]]
[[ -3.53673506e+00 8.93675327e+00 3.27456236e-01 -3.41519475e+00
7.69804525e+00 -5.18698692e+00 -3.96991730e+00]
[ 1.99988627e+00 -9.16149998e+00 -7.49944544e+00 5.02162695e-01
3.57059622e+00 9.17566013e+00 -1.77589107e+00]
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