我通过遵循和调整tensorflow教程,为我的回归问题设计了张量流的神经网络。但是,由于我的问题的结构(大约300.000个数据点和使用昂贵的FTRLOptimizer),我的问题花了很长时间才能执行,即使使用我的32个CPU计算机(我没有GPU)。使用队列的火车模型Tensorflow
根据this comment和htop的快速确认,似乎我有一些单线程操作,它应该是feed_dict。
因此,建议here,我试图使用队列多线程我的程序。
我写了一个简单的代码文件,队列训练的模型如下:
import numpy as np
import tensorflow as tf
import threading
#Function for enqueueing in parallel my data
def enqueue_thread():
sess.run(enqueue_op, feed_dict={x_batch_enqueue: x, y_batch_enqueue: y})
#Set the number of couples (x, y) I use for "training" my model
BATCH_SIZE = 5
#Generate my data where y=x+1+little_noise
x = np.random.randn(10, 1).astype('float32')
y = x+1+np.random.randn(10, 1)/100
#Create the variables for my model y = x*W+b, then W and b should both converge to 1.
W = tf.get_variable('W', shape=[1, 1], dtype='float32')
b = tf.get_variable('b', shape=[1, 1], dtype='float32')
#Prepare the placeholdeers for enqueueing
x_batch_enqueue = tf.placeholder(tf.float32, shape=[None, 1])
y_batch_enqueue = tf.placeholder(tf.float32, shape=[None, 1])
#Create the queue
q = tf.RandomShuffleQueue(capacity=2**20, min_after_dequeue=BATCH_SIZE, dtypes=[tf.float32, tf.float32], seed=12, shapes=[[1], [1]])
#Enqueue operation
enqueue_op = q.enqueue_many([x_batch_enqueue, y_batch_enqueue])
#Dequeue operation
x_batch, y_batch = q.dequeue_many(BATCH_SIZE)
#Prediction with linear model + bias
y_pred=tf.add(tf.mul(x_batch, W), b)
#MAE cost function
cost = tf.reduce_mean(tf.abs(y_batch-y_pred))
learning_rate = 1e-3
train_op = tf.train.GradientDescentOptimizer(learning_rate).minimize(cost)
init = tf.initialize_all_variables()
sess = tf.Session()
sess.run(init)
available_threads = 1024
#Feed the queue
for i in range(available_threads):
threading.Thread(target=enqueue_thread).start()
#Train the model
for step in range(1000):
_, cost_step = sess.run([train_op, cost])
print(cost_step)
Wf=sess.run(W)
bf=sess.run(b)
此代码不起作用,因为每一个我称之为x_batch时间,一个y_batch也出列,反之亦然。然后,我不会将这些功能与相应的“结果”进行比较。
有没有简单的方法来避免这个问题?