我想用tensorflow预测二进制输出。训练数据大约有69%的输出为零。输入特征是实值,我通过减去平均值和除以标准偏差对它们进行归一化。每次我运行网络时,无论我尝试过什么技术,我都无法获得精度高达69%的模型,而且看起来我的Yhat正在趋于全零。Tensorflow趋于平均值
我已经尝试了很多像不同的优化器,损失函数,批量大小等等的东西。但不管我做什么,它收敛到69%,永远不会超过。我猜,我正在做的事情上有一个更有趣的问题,但我似乎无法找到它。
这里是我的代码
X = tf.placeholder(tf.float32,shape=[None,14],name='X')
Y = tf.placeholder(tf.float32,shape=[None,1],name='Y')
W1 = tf.Variable(tf.truncated_normal(shape=[14,20],stddev=0.5))
b1 = tf.Variable(tf.zeros([20]))
l1 = tf.nn.relu(tf.matmul(X,W1) + b1)
l1 = tf.nn.dropout(l1,0.5)
W2 = tf.Variable(tf.truncated_normal(shape=[20,20],stddev=0.5))
b2 = tf.Variable(tf.zeros([20]))
l2 = tf.nn.relu(tf.matmul(l1,W2) + b2)
l2 = tf.nn.dropout(l2,0.5)
W3 = tf.Variable(tf.truncated_normal(shape=[20,15],stddev=0.5))
b3 = tf.Variable(tf.zeros([15]))
l3 = tf.nn.relu(tf.matmul(l2,W3) + b3)
l3 = tf.nn.dropout(l3,0.5)
W5 = tf.Variable(tf.truncated_normal(shape=[15,1],stddev=0.5))
b5 = tf.Variable(tf.zeros([1]))
Yhat = tf.matmul(l3,W5) + b5
loss = tf.reduce_mean(tf.nn.sigmoid_cross_entropy_with_logits(logits=Yhat, labels=Y))
learning_rate = 0.005
l2_weight = 0.001
learner = tf.train.AdamOptimizer(learning_rate).minimize(loss)
correct_prediction = tf.equal(tf.greater(Y,0.5), tf.greater(Yhat,0.5))
accuracy = tf.reduce_mean(tf.cast(correct_prediction, tf.float32))
感谢您的建议。它没有解决问题,但我确信一旦我超过这个问题,它会有所帮助。 – Iinferno1