fetch :
a1=tf.constant(2)
a2=tf.constant(3)
a3=tf.constant(4)
r1=tf.add(a1,a2)
r2=tf.multiply(r1,a1)
with tf.Session() as sess:
r=sess.run([r2,r1]) # 可以两个操作都运算
print(r)
feed:
a1=tf.placeholder(tf.float32) # 占位符
a2=tf.placeholder(tf.float32)
r=tf.multiply(a1,a2)
with tf.Session() as sess:
a=sess.run(r,feed_dict={a1:22,a2:3}) # 在这里赋上数值
print(a)