在TensorFlow中修改已恢复的CNN模型的权重和偏差 [英] Modifying the weights and biases of a restored CNN model in TensorFlow
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问题描述
我最近开始使用TensorFlow(TF),遇到一个需要帮助的问题.基本上,我已经恢复了预训练的模型,在重新测试其准确性之前,需要修改其一层的权重和偏差.现在,我的问题如下:
如何使用TF中的assign
方法更改权重和偏差?甚至可以在TF中修改已还原模型的权重吗?
I have recently started using TensorFlow (TF), and I have come across a problem that I need some help with. Basically, I've restored a pre-trained model, and I need to modify the weights and biases of one of its layers before I retest its accuracy. Now, my problem is the following:
how can I change the weights and biases using the assign
method in TF? Is modifying the weights of a restored modeled even possible in TF?
这是我的代码:
import tensorflow as tf
from tensorflow.examples.tutorials.mnist import input_data # Imports the MINST dataset
# Data Set:
# ---------
mnist = input_data.read_data_sets("/home/frr/MNIST_data", one_hot=True)# An object where data is stored
ImVecDim = 784# The number of elements in a an image vector (flattening a 28x28 2D image)
NumOfClasses = 10
g = tf.get_default_graph()
with tf.Session() as sess:
LoadMod = tf.train.import_meta_graph('simple_mnist.ckpt.meta') # This object loads the model
LoadMod.restore(sess, tf.train.latest_checkpoint('./'))# Loading weights and biases and other stuff to the model
# ( Here I'd like to modify the weights and biases of layer 1, set them to one for example, before I go ahead and test the accuracy ) #
# Testing the acuracy of the model:
X = g.get_tensor_by_name('ImageIn:0')
Y = g.get_tensor_by_name('LabelIn:0')
KP = g.get_tensor_by_name('KeepProb:0')
Accuracy = g.get_tensor_by_name('NetAccuracy:0')
feed_dict = { X: mnist.test.images[:256], Y: mnist.test.labels[:256], KP: 1.0 }
print( 'Model Accuracy = ' )
print( sess.run( Accuracy, feed_dict ) )
推荐答案
In addition to an existing answer, tensor update can be performed via tf.assign
function.
v1 = sess.graph.get_tensor_by_name('v1:0')
print(sess.run(v1)) # 1.0
sess.run(tf.assign(v1, v1 + 1))
print(sess.run(v1)) # 2.0
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