tensorflow: variable的值与variable.read_value()的值区别详解

# coding=utf-8
import tensorflow as tf

# Create a variable.
w = tf.Variable(initial_value=10., dtype=tf.float32)

sess = tf.InteractiveSession()
sess.run(tf.global_variables_initializer())

print '\nw.read_value() :\n', w.read_value(), '\n', w.read_value().eval()
print '\nw :\n', w, '\n', w.eval()

sess.close()

w.read_value() :
Tensor("read:0", shape=(), dtype=float32) 
10.0

w :
<tf.Variable 'Variable:0' shape=() dtype=float32_ref> 
10.0