Tensorflow | 基本函数介绍
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这次来总结下这几天学习tensorflow的心得,包含了一些基本的函数,例如,加减乘除等,下面来一一介绍,并给出具体的例子。
两个小的tips
我的版本:anaconda 4.2 tensorflow 0.12.1
若是你不知道如何在windows下安装tensorflow,可以依照我的博客:http://blog.csdn.net/xxzhangx/article/details/54379255 ,遵循上面的顺序来做;若是安装过程中遇到问题,可以在博客下方留言,看到后会及时回答。
数值乘法mul
例如:a=3,b=3,a*b = 9
import tensorflow as tfa = tf.placeholder(tf.float32)b = tf.placeholder(tf.float32)y = tf.mul(a, b)sess = tf.Session() print (sess.run(y, feed_dict={a: 3, b: 3}))
结果:9.0
数值和add
例如: a = 3, b=3 ,a+b = 6
import tensorflow as tfa = tf.placeholder(tf.float32)b = tf.placeholder(tf.float32)y = tf.add(a, b)sess = tf.Session() print (sess.run(y, feed_dict={a: 3, b: 3}))
结果:6.0
数值减法sub
例如:a=3,b=3,a-b = 0
import tensorflow as tfa = tf.placeholder(tf.float32)b = tf.placeholder(tf.float32)y = tf.sub(a, b)sess = tf.Session() print (sess.run(y, feed_dict={a: 3, b: 3}))
结果: 0.0
数值除法div
例如: a=3,b=3,a/b = 1.0
import tensorflow as tfa = tf.placeholder(tf.float32)b = tf.placeholder(tf.float32)y = tf.div(a, b)sess = tf.Session() print (sess.run(y, feed_dict={a: 3, b: 3}))
结果: 1.0
数值取模mod
例如:a=3,b=3,a mod b = 0
import tensorflow as tfa = tf.placeholder(tf.float32)b = tf.placeholder(tf.float32)y = tf.mod(a, b)sess = tf.Session() print (sess.run(y, feed_dict={a: 3, b: 3}))
结果: 0.0
数值绝对值abs
例如:a=-3, abs (a) = 3
import tensorflow as tfa = tf.placeholder(tf.float32)b = tf.placeholder(tf.float32)y = tf.abs(a)sess = tf.Session() print (sess.run(y, feed_dict={a: -3}))
结果: 3.0
数值非负值neg
例如:a=-3, neg (a) = 3
import tensorflow as tfa = tf.placeholder(tf.float32)y = tf.neg(a)sess = tf.Session() print (sess.run(y, feed_dict={a: -3}))
结果: 3.0
数值符号函数sign
例如:a=-3, neg (a) = 3
import tensorflow as tfa = tf.placeholder(tf.float32)y = tf.neg(a)sess = tf.Session() print (sess.run(y, feed_dict={a: -3}))
结果: 3.0
数值符号函数sign
例如: a=-3,sign(a) = -1
import tensorflow as tfa = tf.placeholder(tf.float32)y = tf.sign(a)sess = tf.Session() print (sess.run(y, feed_dict={a: -3}))
结果: -1.0
数值倒数inv
例如: a=-3,sign(a) = -1
import tensorflow as tfa = tf.placeholder(tf.float32)y = tf.sign(a)sess = tf.Session() print (sess.run(y, feed_dict={a: -3}))
结果: -1.0
数值平方square
例如: a=-3,square(a) = 9
import tensorflow as tfa = tf.placeholder(tf.float32)y = tf.square(a)sess = tf.Session() print (sess.run(y, feed_dict={a: -3}))
结果: 9.0
数值最近的整数round
例如: a=-3.6,round(a) = -4.0
import tensorflow as tfy = tf.round(a)sess = tf.Session() print (sess.run(y, feed_dict={a: -3.6}))
结果: -4.0
例如: a=-3.3,round(a) = -3.0
import tensorflow as tfy = tf.round(a)sess = tf.Session() print (sess.run(y, feed_dict={a: -3.3}))
结果:-3.0
数值平方根sqrt
例如: a=4,sqrt(a) = 2
import tensorflow as tfa = tf.placeholder(tf.float32)y = tf.sqrt(a)sess = tf.Session() print (sess.run(y, feed_dict={a: 4}))
结果: 2.0
数值幂次pow
例如: a=2,b=3,pow(a,b) = 8
import tensorflow as tfa = tf.placeholder(tf.float64)b = tf.placeholder(tf.float64)y = tf.pow(a, b)sess = tf.Session() print (sess.run(y, feed_dict={a: 2, b: 3}))
结果: 8.0
数值最近的整数exp
例如: a=2,exp(a) = 7.38906
import tensorflow as tfa = tf.placeholder(tf.float32)y = tf.exp(a)sess = tf.Session() print (sess.run(y, feed_dict={a: 2}))
结果: 7.38906
数值取对数log
例如: a=-3.6,round(a) = -4.0
import tensorflow as tfa = tf.placeholder(tf.float32)y = tf.log(a)sess = tf.Session() print (sess.run(y, feed_dict={a: 2}))
结果: 0.69314718056
数值取最大值maximum
例如: a=-3.6, b = 2,maximum(a,b)=2
import tensorflow as tfa = tf.placeholder(tf.float32)b = tf.placeholder(tf.float32)y = tf.maximum(a,b)sess = tf.Session() print (sess.run(y, feed_dict={a: -3.6,b: 2}))
结果: 2.0
数值最小值minimum
例如: a=2,b=3minimum(a) = 3
import tensorflow as tfa = tf.placeholder(tf.float64)b = tf.placeholder(tf.float64)y = tf.minimum(a, b)sess = tf.Session() print (sess.run(y, feed_dict={a: 2, b: 3}))
结果: 2.0
数值余弦函数cos
例如: a=2,cos(a) = -0.416146836547
import tensorflow as tfa = tf.placeholder(tf.float64)y = tf.cos(a)sess = tf.Session() print (sess.run(y, feed_dict={a: 2}))
结果: -0.416146836547
数值正弦函数sin
例如: a=2,sin(a) = -0.416146836547
import tensorflow as tfa = tf.placeholder(tf.float64)y = tf.sin(a)sess = tf.Session() print (sess.run(y, feed_dict={a: 2}))
结果: 0.909297426826
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