TensorFlow：四则运算

「爱情、让人受尽委屈。」 2022-04-25 09:10 235阅读 0赞

##### 1.常量四则运算 #####

data1 = tf.constant(6)
    data2 = tf.constant(2)
    dataAdd = tf.add(data1,data2)    # 加
    dataMul = tf.multiply(data1,data2)    # 乘
    dataSub = tf.subtract(data1,data2)    # 减
    dataDiv = tf.divide(data1,data2)    # 除
    with tf.Session() as sess:
        print(sess.run(dataAdd))
        print(sess.run(dataMul))
        print(sess.run(dataSub))
        print(sess.run(dataDiv))

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70]

##### 2.变量四则运算 #####

data1 = tf.constant(6)
    data2 = tf.Variable(2)
    dataAdd = tf.add(data1,data2)    # 加
    dataMul = tf.multiply(data1,data2)    # 乘
    dataSub = tf.subtract(data1,data2)    # 减
    dataDiv = tf.divide(data1,data2)    # 除
    init = tf.global_variables_initializer()
    with tf.Session() as sess:
        sess.run(init)
        print(sess.run(dataAdd))
        print(sess.run(dataMul))
        print(sess.run(dataSub))
        print(sess.run(dataDiv))

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70 1]

##### 3.其他用法 #####

data1 = tf.constant(6)
    data2 = tf.Variable(2)
    dataAdd = tf.add(data1,data2)    # 加
    dataCopy = tf.assign(data2,dataAdd)
    init = tf.global_variables_initializer()
    with tf.Session() as sess:
        sess.run(init)
        print('sess.run(dataCopy)',sess.run(dataCopy))
        print('dataCopy.eval()',dataCopy.eval())
        print('tf.get_default_session().run(dataCopy)',tf.get_default_session().run(dataCopy))

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70 2]  
tf.assign(data2,dataAdd) 指的是将dataAdd赋值给data2，所以此时data2的值为8  
dataCopy.eval() ： .eval()的作用类似于.run()，所以dataCopy.eval() 同等于dataAdd = tf.add(data1,data2) 即6与8的合为14，再讲14重新赋值给data2，所以结果为14  
同样道理tf.get\_default\_session().run(dataCopy) 为14+6 =20

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