tensorflow_1

install

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pip install tensorflow

显示tensorflow的版本

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import tensorflow as tf
tf.__version__

##

tf.constant 定义常量
tf.Variable 定义变量
tf.placeholder 占位符，用于填充数据

  • 定义一个矩阵

  • sigmoid

Tensorboard

  1. 把计算过程用tf.name_scope包装起来
  2. 使用tf.summary.FileWriter输出到目标文件夹
  3. 启动Tensorboard

如果一个op中只有直接的赋值，那么这个op不会显示在Tensorboard中

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tensorboard --logdir=/test
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import tensorflow as tf
import os

os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'

if __name__ == '__main__':
    const_A = tf.constant(10, name = 'const_A', dtype = tf.int64)

    const_B = tf.constant(20, name = 'const_B', dtype = tf.int64)

    placeholder_C = tf.placeholder(dtype = tf.int64)

    with tf.name_scope('Add'):
        _sum = const_A + const_B

    with tf.Session() as session:
        session.run(tf.global_variables_initializer())

        const_sum = session.run(_sum)
        print(const_sum)

    train_writer = tf.summary.FileWriter('/test', session.graph)
    train_writer.close()

Reference

1.https://dotblogs.com.tw/shaynling/2017/11/14/173025

2.https://www.tensorflow.org/api_docs/python/tf/matmul