TensorFlow - 批量处理数据

flyfish
import tensorflow as tf import numpy as np feature_size=50 dataset_size=255 X
= np.random.rand(dataset_size,feature_size) print(X.shape) Y =
np.random.rand(dataset_size,1) #Y=Y.reshape(-1,1) print(Y.shape) #
定义训练数据batch的大小 batch_size=100 # 定义神经网络参数
w=tf.Variable(tf.random_normal([feature_size,1],stddev=1,seed=1)) b =
tf.Variable(0.0, name="biases",dtype=tf.float32)
x=tf.placeholder(tf.float32,shape=(None,feature_size),name='x-input')
y_=tf.placeholder(tf.float32,shape=(None,1),name='y-input') # 定义前向传播
y=tf.add(tf.matmul( x,w) ,b)# 定义损失函数和反向传播算法
cross_entropy=-tf.reduce_mean(y_*tf.log(tf.clip_by_value(y,1e-10,1.0)))
train_step=tf.train.AdamOptimizer(0.001).minimize(cross_entropy) #cross_entropy
= tf.reduce_mean(tf.square(y - y_)) #optimizer =
tf.train.GradientDescentOptimizer(0.0000001) # 学习率为0.0001的梯度下降法 #train_step =
optimizer.minimize(cross_entropy) with tf.Session() as sess:
init_op=tf.global_variables_initializer() sess.run(init_op) print('训练前网络参数的值为:'
) print(sess.run(w)) print(sess.run(b))# 设定训练的轮数 STEPS=5000 for i in
range(STEPS):# 每次选取batch_size个样本进行训练 start=(i*batch_size)%dataset_size
end=min(start+batch_size,dataset_size)# 通过选取的样本训练神经网络并更新参数
sess.run(train_step,feed_dict={x:X[start:end],y_:Y[start:end]})if i % 1000==0:
# 每隔一段时间计算在所有数据上的交叉熵并输出
total_cross_entropy=sess.run(cross_entropy,feed_dict={x:X,y_:Y}) print("After
{} training step(s),cross entropy on all data is {}".
format(i,total_cross_entropy)) print('训练后网络参数的值为:') print(sess.run(w))
print(sess.run(b))
批量随机选择数据进行训练
X #特征 Y #标签 X_pred 要预测的数据 [dataset_size,feature_size]=X.shape dfX =
pd.DataFrame(X) dfX.fillna(0.0,inplace=True) X=np.array(dfX.values) dfY =
pd.DataFrame(Y) dfY.fillna(0.0,inplace=True) Y=np.array(dfY.values)
Y=Y.reshape(-1,1) dfY.to_csv('../data/Y_train_time.csv', index=False)
print(X.shape) print(Y.shape) X1 = tf.nn.l2_normalize(X, dim =0) with
tf.Session()as sess: X=sess.run(X1) Y1 = tf.nn.l2_normalize(Y, dim = 0) with
tf.Session()as sess: Y=sess.run(Y1) batch_size=100 # 定义神经网络参数
w=tf.Variable(tf.random_normal([feature_size,1],stddev=1,seed=1)) b =
tf.Variable(0.0, name="biases",dtype=tf.float32)
x=tf.placeholder(tf.float32,shape=(None,feature_size),name='x-input')
y_=tf.placeholder(tf.float32,shape=(None,1),name='y-input') # 定义前向传播
y=tf.add(tf.matmul( x,w) ,b)# 定义损失函数和反向传播算法
cross_entropy=-tf.reduce_mean(y_*tf.log(tf.clip_by_value(y,1e-10,1.0)))
train_step=tf.train.AdamOptimizer(0.001).minimize(cross_entropy) '''
cross_entropy = tf.reduce_mean(tf.square(y - y_)) optimizer =
tf.train.GradientDescentOptimizer(0.5) # 学习率为的梯度下降法 train_step =
optimizer.minimize(cross_entropy) ''' with tf.Session() as sess: saver =
tf.train.Saver() init_op=tf.global_variables_initializer() sess.run(init_op)
print('训练前网络参数的值为:') print(sess.run(w)) print(sess.run(b)) # 设定训练的轮数 准备做随机批量
STEPS=dataset_sizefor i in range(STEPS): # 每次选取batch_size个样本进行训练 rand_index =
np.random.choice(dataset_size,size=(batch_size)) rand_x = X[rand_index] rand_y
= Y[rand_index] sess.run(train_step,feed_dict={x:rand_x,y_: rand_y})if i % 100==
0: # 每隔一段时间计算在所有数据上的交叉熵并输出
total_cross_entropy=sess.run(cross_entropy,feed_dict={x:X,y_:Y}) print("After
{} training step(s),cross entropy on all data is {}".
format(i,total_cross_entropy)) print('训练后网络参数的值为:') print(sess.run(w))
print(sess.run(b)) save_path = saver.save(sess, model_path) print("complete
train") result = sess.run(y, feed_dict={x: X}) print(result) df =
pd.DataFrame(result) df['ID'] = pd.Series(df.index+1)
df.to_csv(output_file_path, index=False) print("complete predict")

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