python TensorFlow 測試程式碼
阿新 • • 發佈:2018-11-07
import tensorflow as tf import numpy as np #create data x_data = np.random.rand(100).astype(np.float32) y_data = x_data*0.1 + 0.3 ###create tensorflow structure start ### Weight = tf.Variable(tf.random_uniform([1],-1.0,1.0)) #一維向量,從-1.0到1.0 biases = tf.Variable(tf.zeros([1])) #一維0向量 y = Weight*x_data + biases loss = tf.reduce_mean(tf.square(y-y_data)) optimizer = tf.train.GradientDescentOptimizer(0.5) #梯度下降優化器 train = optimizer.minimize(loss) #訓練器 init = tf.initialize_all_variables() #初始化變數 ###create tensorflow structure end ### sess = tf.Session() #建立會話 sess.run(init) #啟用整個神經網路very important for step in range(201): sess.run(train) if step % 20 == 0: print(step,sess.run(Weight),sess.run(biases))
輸出結果:
0 [0.6798785] [-0.03761964]
20 [0.20823106] [0.2404822]
40 [0.11992885] [0.28904086]
60 [0.10366957] [0.29798207]
80 [0.10067568] [0.29962844]
100 [0.10012442] [0.2999316]
120 [0.10002291] [0.2999874]
140 [0.10000422] [0.2999977]
160 [0.10000079] [0.29999956]
180 [0.10000015] [0.29999992]
200 [0.10000005] [0.29999998]
來自:《莫煩python》