【北京大学】2 TensorFlow1.x的张量、计算图、会话

旧城等待， 2022-12-29 02:00 152阅读 0赞

# 1 张量 #

张量（tensor）：多维数组（列表）  
阶：表示张量的维度  
![在这里插入图片描述][20201219110701177.png_pic_center]

数据类型：tf.float32 tf.int32…

#coding:utf-8
    import tensorflow as tf       #引入模块 
    a = tf.constant([1.0, 2.0])   #定义一个张量等于[1.0,2.0] 
    b = tf.constant([3.0, 4.0])   #定义一个张量等于[3.0,4.0] 
    result = a+b                  #实现 a 加 b 的加法 
    print result               #打印出结果

![在这里插入图片描述][20201219110711273.png_pic_center]

为了使得linux系统更方便使用vim。更改vim配置

> vim ~/.vimrc  
> \#写入以下内容  
> set ts = 4  
> set nu

# 2 计算图 #

计算图（Graph）：搭建神经网络的计算过程，只搭建  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNTY5Ng_size_16_color_FFFFFF_t_70_pic_center]

#coding=utf-8
    import tensorflow as tf
    x = tf.constant([[1.0, 2.0]])
    w = tf.constant([[3.0], [4.0]])
    y = tf.matmul(x,w)#计算图（Graph）：
    print y

# 3 会话 #

会话（session）：执行计算图中节点计算

#coding=utf-8
    import tensorflow as tf
    x = tf.constant([[1.0, 2.0]])
    w = tf.constant([[3.0], [4.0]])
    y = tf.matmul(x,w)#计算图（Graph）：
    print y
    with tf.Session() as sess:
        print sess.run(y)# 执行计算图中的节点运算。

# 相关笔记 #

以下所有源码以及更详细PDF笔记请在github下载  
[TensorFolwNotebook-from-Peking-University][]

1.  [【北京大学】1 TensorFlow1.x中Python基础知识][1 TensorFlow1.x_Python]
2.  [【北京大学】2 TensorFlow1.x的张量、计算图、会话][2 TensorFlow1.x]
3.  [【北京大学】3 TensorFlow1.x的前向传播推导与实现][3 TensorFlow1.x]
4.  [【北京大学】4 TensorFlow1.x的反向传播推导与实现][4 TensorFlow1.x]
5.  [【北京大学】5 TensorFlow1.x的损失函数和交叉熵举例讲解及实现][5 TensorFlow1.x]
6.  [【北京大学】6 TensorFlow1.x的学习率、滑动平均和正则化实例及实现][6 TensorFlow1.x]
7.  [【北京大学】7 TensorFlow1.x的神经网络模块设计思想举例及实现][7 TensorFlow1.x]
8.  [【北京大学】8 TensorFlow1.x的Mnist数据集实例实现][8 TensorFlow1.x_Mnist]
9.  [【北京大学】9 TensorFlow1.x的实现自定义Mnist数据集][9 TensorFlow1.x_Mnist]
10. [【北京大学】10 TensorFlow1.x的卷积神经网络(CNN)相关基础知识][10 TensorFlow1.x_CNN]
11. [【北京大学】11 TensorFlow1.x的卷积神经网络模型Lenet5实现][11 TensorFlow1.x_Lenet5]
12. [【北京大学】12 TensorFlow1.x的卷积神经网络模型VGGNet实现][12 TensorFlow1.x_VGGNet]
13. [【北京大学】13 TensorFlow1.x的项目实战之手写英文体识别OCR技术][13 TensorFlow1.x_OCR]
14. [【北京大学】14 TensorFlow1.x的二值神经网络实现MNIST数据集手写数字识别][14 TensorFlow1.x_MNIST]
15. [【北京大学】15 TensorFlow1.x的项目实战之人脸表情识别][15 TensorFlow1.x]
16. [【北京大学】16 TensorFlow1.x的项目实战之图像风格融合与快速迁移][16 TensorFlow1.x]

[20201219110701177.png_pic_center]: /images/20221120/8df4863416a9491180d26334c1ef8884.png
[20201219110711273.png_pic_center]: https://img-blog.csdnimg.cn/20201219110711273.png#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNTY5Ng_size_16_color_FFFFFF_t_70_pic_center]: https://img-blog.csdnimg.cn/20201219110723232.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNTY5Ng==,size_16,color_FFFFFF,t_70#pic_center
[TensorFolwNotebook-from-Peking-University]: https://github.com/823316627bandeng/-TensorFolwNotebook-from-Peking-University
[1 TensorFlow1.x_Python]: https://betterbench.blog.csdn.net/article/details/111400935
[2 TensorFlow1.x]: https://betterbench.blog.csdn.net/article/details/111401620
[3 TensorFlow1.x]: https://betterbench.blog.csdn.net/article/details/111407104
[4 TensorFlow1.x]: https://betterbench.blog.csdn.net/article/details/111407700
[5 TensorFlow1.x]: https://betterbench.blog.csdn.net/article/details/111409255
[6 TensorFlow1.x]: https://betterbench.blog.csdn.net/article/details/111410367
[7 TensorFlow1.x]: https://betterbench.blog.csdn.net/article/details/111410935
[8 TensorFlow1.x_Mnist]: https://betterbench.blog.csdn.net/article/details/111414788
[9 TensorFlow1.x_Mnist]: https://betterbench.blog.csdn.net/article/details/111480327
[10 TensorFlow1.x_CNN]: https://betterbench.blog.csdn.net/article/details/111495960
[11 TensorFlow1.x_Lenet5]: https://betterbench.blog.csdn.net/article/details/111499496
[12 TensorFlow1.x_VGGNet]: https://betterbench.blog.csdn.net/article/details/111516848
[13 TensorFlow1.x_OCR]: https://betterbench.blog.csdn.net/article/details/111567501
[14 TensorFlow1.x_MNIST]: https://betterbench.blog.csdn.net/article/details/111590573
[15 TensorFlow1.x]: https://betterbench.blog.csdn.net/article/details/111594356
[16 TensorFlow1.x]: https://betterbench.blog.csdn.net/article/details/111641487