GPU版线性回归

#import keras
#import numpy as np
#import matplotlib.pyplot as plt

#from keras.models import Sequential
#全连接层
#from keras.layers import Dense 

import numpy as np
import matplotlib.pyplot as plt

from tensorflow import keras
from tensorflow.keras.models import Sequential
#全连接层
from tensorflow.keras.layers import Dense 

x_data = np.random.rand(100)
noise = np.random.normal(0,0.01,x_data.shape)
y_data = x_data*0.1 + 0.2 + noise

plt.scatter(x_data,y_data)
plt.show()

model = Sequential()
#model = multi_gpu_model(model, 1)  #GPU个数为2

model.add(Dense(units=1,input_dim=1))
#sgd 随机梯度下降  mse 均方误差
model.compile(optimizer='sgd',loss='mse')

for step in range(5000):
    cost = model.train_on_batch(x_data, y_data)   

    if step % 500 == 0:
        print('cost:',cost)

W,b=model.layers[0].get_weights()
print('w:',W,'b:',b)

y_pred=model.predict(x_data)
plt.scatter(x_data,y_data)
plt.plot(x_data,y_pred,'r',lw=2)
plt.show()