5.什么是tensor（下）

import tensorflow as tf

# tensorflow还支持变量的定义
var = tf.Variable(3)
print(var)  # <tf.Variable ‘Variable:0‘ shape=() dtype=int32_ref>

# 也可以指定类型和名字
var1 = tf.Variable(4, name="mmp", dtype=tf.float64)
print(var1)  # <tf.Variable ‘mmp:0‘ shape=() dtype=float64_ref>

# 关于参数shape，表示变量是几维的
var2 = tf.Variable([1, 2, 3])
print(var2)  # <tf.Variable ‘Variable_1:0‘ shape=(3,) dtype=int32_ref>

var3 = tf.Variable([[1, 2, 3], [4, 5, 6]])
print(var3)  # <tf.Variable ‘Variable_2:0‘ shape=(2, 3) dtype=int32_ref>