在二元分類中的損耗值沒有改變我試圖用一個深層神經網絡結構對二進制標籤值分類 - 0和+1。這是我的代碼來做tensorflow。也這個問題帶入從討論中previous question更改精度值,並使用Tensorflow
import tensorflow as tf
import numpy as np
from preprocess import create_feature_sets_and_labels
train_x,train_y,test_x,test_y = create_feature_sets_and_labels()
x = tf.placeholder('float', [None, 5])
y = tf.placeholder('float')
n_nodes_hl1 = 500
n_nodes_hl2 = 500
# n_nodes_hl3 = 500
n_classes = 1
batch_size = 100
def neural_network_model(data):
hidden_1_layer = {'weights':tf.Variable(tf.random_normal([5, n_nodes_hl1])),
'biases':tf.Variable(tf.random_normal([n_nodes_hl1]))}
hidden_2_layer = {'weights':tf.Variable(tf.random_normal([n_nodes_hl1, n_nodes_hl2])),
'biases':tf.Variable(tf.random_normal([n_nodes_hl2]))}
# hidden_3_layer = {'weights':tf.Variable(tf.random_normal([n_nodes_hl2, n_nodes_hl3])),
# 'biases':tf.Variable(tf.random_normal([n_nodes_hl3]))}
# output_layer = {'weights':tf.Variable(tf.random_normal([n_nodes_hl3, n_classes])),
# 'biases':tf.Variable(tf.random_normal([n_classes]))}
output_layer = {'weights':tf.Variable(tf.random_normal([n_nodes_hl2, n_classes])),
'biases':tf.Variable(tf.random_normal([n_classes]))}
l1 = tf.add(tf.matmul(data, hidden_1_layer['weights']), hidden_1_layer['biases'])
l1 = tf.nn.relu(l1)
l2 = tf.add(tf.matmul(l1, hidden_2_layer['weights']), hidden_2_layer['biases'])
l2 = tf.nn.relu(l2)
# l3 = tf.add(tf.matmul(l2, hidden_3_layer['weights']), hidden_3_layer['biases'])
# l3 = tf.nn.relu(l3)
# output = tf.transpose(tf.add(tf.matmul(l3, output_layer['weights']), output_layer['biases']))
output = tf.add(tf.matmul(l2, output_layer['weights']), output_layer['biases'])
return output
def train_neural_network(x):
prediction = tf.sigmoid(neural_network_model(x))
cost = tf.reduce_mean(tf.nn.sigmoid_cross_entropy_with_logits(prediction, y))
optimizer = tf.train.AdamOptimizer().minimize(cost)
hm_epochs = 10
with tf.Session() as sess:
sess.run(tf.initialize_all_variables())
for epoch in range(hm_epochs):
epoch_loss = 0
i = 0
while i < len(train_x):
start = i
end = i + batch_size
batch_x = np.array(train_x[start:end])
batch_y = np.array(train_y[start:end])
_, c = sess.run([optimizer, cost], feed_dict={x: batch_x,
y: batch_y})
epoch_loss += c
i+=batch_size
print('Epoch', epoch, 'completed out of', hm_epochs, 'loss:', epoch_loss)
# correct = tf.equal(tf.argmax(prediction, 1), tf.argmax(y, 1))
# accuracy = tf.reduce_mean(tf.cast(correct, 'float'))
predicted_class = tf.greater(prediction,0.5)
correct = tf.equal(predicted_class, tf.equal(y,1.0))
accuracy = tf.reduce_mean(tf.cast(correct, 'float'))
# print (test_x.shape)
# accuracy = tf.nn.l2_loss(prediction-y,name="squared_error_test_cost")/test_x.shape[0]
print('Accuracy:', accuracy.eval({x: test_x, y: test_y}))
train_neural_network(x)
具體而言,(結轉討論從前面的問題)我刪除一個層 - hidden_3_layer
。改變
prediction = neural_network_model(x)
到
prediction = tf.sigmoid(neural_network_model(x))
,並添加根據Neil的回答predicted_class, correct, accuracy
部分。我也在我的csv中將所有-1s更改爲0。
這是我的跟蹤:
('Epoch', 0, 'completed out of', 10, 'loss:', 37.312037646770477)
('Epoch', 1, 'completed out of', 10, 'loss:', 37.073578298091888)
('Epoch', 2, 'completed out of', 10, 'loss:', 37.035196363925934)
('Epoch', 3, 'completed out of', 10, 'loss:', 37.035196363925934)
('Epoch', 4, 'completed out of', 10, 'loss:', 37.035196363925934)
('Epoch', 5, 'completed out of', 10, 'loss:', 37.035196363925934)
('Epoch', 6, 'completed out of', 10, 'loss:', 37.035196363925934)
('Epoch', 7, 'completed out of', 10, 'loss:', 37.035196363925934)
('Epoch', 8, 'completed out of', 10, 'loss:', 37.035196363925934)
('Epoch', 9, 'completed out of', 10, 'loss:', 37.035196363925934)
('Accuracy:', 0.42608696)
正如你所看到的,損失也不會降低。因此我不知道它是否仍然正常工作。
下面是多次再運行的結果。結果搖曳似地:
('Epoch', 0, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 1, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 2, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 3, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 4, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 5, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 6, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 7, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 8, 'completed out of', 10, 'loss:', 26.513012945652008)
('Epoch', 9, 'completed out of', 10, 'loss:', 26.513012945652008)
('Accuracy:', 0.60124224)
另一:
('Epoch', 0, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 1, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 2, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 3, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 4, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 5, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 6, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 7, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 8, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 9, 'completed out of', 10, 'loss:', 22.873702049255371)
('Accuracy:', 1.0)
和另一:0.0 -_-
('Epoch', 0, 'completed out of', 10, 'loss:', 23.163824260234833)
('Epoch', 1, 'completed out of', 10, 'loss:', 22.88000351190567)
('Epoch', 2, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 3, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 4, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 5, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 6, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 7, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 8, 'completed out of', 10, 'loss:', 22.873702049255371)
('Epoch', 9, 'completed out of', 10, 'loss:', 22.873702049255371)
('Accuracy:', 0.99627328)
我還看到的精度值--- ------------編輯---------------
有關數據和數據處理的一些細節。我正在使用來自Yahoo!的IBM每日股票數據。融資20年(幾乎)。這相當於大約5200行條目。
這是我如何處理我吧:
import numpy as np
import pandas as pd
from sklearn.preprocessing import MinMaxScaler
import csv
import pickle
def create_feature_sets_and_labels(test_size = 0.2):
df = pd.read_csv("ibm.csv")
df = df.iloc[::-1]
features = df.values
testing_size = int(test_size*len(features))
train_x = list(features[1:,1:6][:-testing_size])
train_y = list(features[1:,7][:-testing_size])
test_x = list(features[1:,1:6][-testing_size:])
test_y = list(features[1:,7][-testing_size:])
scaler = MinMaxScaler(feature_range=(-5,5))
train_x = scaler.fit_transform(train_x)
train_y = scaler.fit_transform(train_y)
test_x = scaler.fit_transform(test_x)
test_y = scaler.fit_transform(test_y)
return train_x, train_y, test_x, test_y
if __name__ == "__main__":
train_x, train_y, test_x, test_y = create_feature_sets_and_labels()
with open('stockdata.pickle', 'wb') as f:
pickle.dump([train_x, train_y, test_x, test_y], f)
列0是日期。所以這不被用作一個功能。我也沒有列7.我使用sklearn
的MinMaxScaler()
在-5到5的範圍內對數據進行歸一化。
-------------編輯2 ------- ------------
我注意到,當數據在非規範化的形式呈現在系統不改變其準確性。
好的,我再次改變了代碼。精度仍在65-100之間擺動。我也試圖改變自己的時代價值,以找到損失開始穩定的地方,但即使在100個時代,它們也在不斷下降。 –
準確性波動似乎有點奇怪。也許我錯過了什麼。你能否添加一些關於輸入數據的細節以及你如何預處理它?訓練集和測試集有多大(您所描述的行爲我期望從非常小的數據集中得到)?這是來自公共來源的標準數據嗎?是否有強烈的傾向於主要是積極的或主要是負面的課程? –
另外,讓我們來檢查你的真實班級數據的形狀。如果將'y = tf.placeholder('float')'更改爲'y = tf.placeholder('float',[None,1]),會發生什麼? –