一,
import os
os.environ['TF_CPP_MIN_LOG_LEVEL']='2'
# 两层简单的神经网络(全连接)
import tensorflow as tf
# 定义输入和参数
x=tf.constant([[0.7,0.5]])
w1=tf.Variable(tf.random_normal([2,3],stddev=1,seed=1))
w2=tf.Variable(tf.random_normal([3,1],stddev=1,seed=1))
# 定义前向传播过程
a=tf.matmul(x,w1)
y=tf.matmul(a,w2)
#用会话计算结果
with tf.Session() as sess:
init_op=tf.global_variables_initializer()
sess.run(init_op)
print("y in tf 3_3 is:\n",sess.run(y))
二,
import os
os.environ['TF_CPP_MIN_LOG_LEVEL']='2'
# 两层简单的神经网络(全连接)
import tensorflow as tf
# 定义输入和参数
# 用placeholder实现输入定义(sess.run中喂一组数据)
x=tf.placeholder(tf.float32,shape=(1,2))
w1=tf.Variable(tf.random_normal([2,3],stddev=1,seed=1))
w2=tf.Variable(tf.random_normal([3,1],stddev=1,seed=1))
# 定义前向传播过程
a=tf.matmul(x,w1)
y=tf.matmul(a,w2)
#用会话计算结果
with tf.Session() as sess:
init_op=tf.global_variables_initializer()
sess.run(init_op)
print("y in tf 3_3 2 is:\n",sess.run(y,feed_dict={x:[[0.7,0.5]]}))
三,
import os
os.environ['TF_CPP_MIN_LOG_LEVEL']='2'
# 两层简单的神经网络(全连接)
import tensorflow as tf
# 定义输入和参数
# 用placeholder实现输入定义(sess.run中喂多组数据)
x=tf.placeholder(tf.float32,shape=(None,2))
w1=tf.Variable(tf.random_normal([2,3],stddev=1,seed=1))
w2=tf.Variable(tf.random_normal([3,1],stddev=1,seed=1))
# 定义前向传播过程
a=tf.matmul(x,w1)
y=tf.matmul(a,w2)
#用会话计算结果
with tf.Session() as sess:
init_op=tf.global_variables_initializer()
sess.run(init_op)
print("y in tf 3_3 3 is:\n",sess.run(y,feed_dict={x:[[0.7,0.5],[0.2,0.3],[0.3,0.4],[0.4,0.5]]}))
print("w1:\n",sess.run(w1))
print("w2:\n",sess.run(w2))