我想用tensorflow拟合一个非常简单的线性回归模型。然而,损失(均方误差)却不是减少到零。tensorflow线性回归误差爆炸
首先,我生成我的数据:
x_data = np.random.uniform(high=10,low=0,size=100)
y_data = 3.5 * x_data -4 + np.random.normal(loc=0, scale=2,size=100)
然后,我定义的计算图表:
X = tf.placeholder(dtype=tf.float32, shape=100)
Y = tf.placeholder(dtype=tf.float32, shape=100)
m = tf.Variable(1.0)
c = tf.Variable(1.0)
Ypred = m*X + c
loss = tf.reduce_mean(tf.square(Ypred - Y))
optimizer = tf.train.GradientDescentOptimizer(learning_rate=.1)
train = optimizer.minimize(loss)
最后,运行100个时代:
steps = {}
steps['m'] = []
steps['c'] = []
losses=[]
for k in range(100):
_m = session.run(m)
_c = session.run(c)
_l = session.run(loss, feed_dict={X: x_data, Y:y_data})
session.run(train, feed_dict={X: x_data, Y:y_data})
steps['m'].append(_m)
steps['c'].append(_c)
losses.append(_l)
然而,当我绘制损失时,我得到:
完整的代码也可以找到here。