我正在嘗試實現卷積神經網絡來識別臉部。問題是我想要在10節課上進行訓練,並且能夠在測試時間預測10節以上的課程(例如20節課)。預測臉部識別中的未知臉部
我怎麼能這樣做,而不影響舊文件識別的測試準確率?因爲我得到的測試精度很低,有時爲0.
這是我的代碼。
batch_size = 16
patch_size = 5
depth = 16
num_hidden = 128
num_labels = 12
num_channels = 1
def reformat(dataset, labels):
dataset = dataset.reshape(
(-1, IMAGE_SIZE_H, IMAGE_SIZE_W, num_channels)).astype(np.float32)
labels = (np.arange(num_labels) == labels[:,None]).astype(np.float32)
def accuracy(predictions, labels):
return (100.0 * np.sum(np.argmax(predictions, 1) == np.argmax(labels, 1))
/predictions.shape[0])
graph = tf.Graph()
with graph.as_default():
# Input data.
tf_train_dataset = tf.placeholder(
tf.float32, shape=(batch_size, IMAGE_SIZE_H, IMAGE_SIZE_W, num_channels))
print("tf_train_dataset",tf_train_dataset)
tf_train_labels = tf.placeholder(tf.float32, shape=(batch_size, num_labels))
tf_valid_dataset = tf.constant(valid_dataset)
tf_test_dataset = tf.constant(test_dataset)
layer1_weights = tf.Variable(tf.truncated_normal(
[patch_size, patch_size, num_channels, depth], stddev=0.1))
layer1_biases = tf.Variable(tf.zeros([depth]))
layer2_weights = tf.Variable(tf.truncated_normal(
[patch_size, patch_size, depth, depth], stddev=0.1))
layer2_biases = tf.Variable(tf.constant(1.0, shape=[depth]))
layer3_weights = tf.Variable(tf.truncated_normal(
[IMAGE_SIZE_H // 16 * IMAGE_SIZE_W // 16 * depth, num_hidden], stddev=0.1))
layer3_biases = tf.Variable(tf.constant(1.0, shape=[num_hidden]))
layer4_weights = tf.Variable(tf.truncated_normal(
[num_hidden, num_labels], stddev=0.1))
layer4_biases = tf.Variable(tf.constant(1.0, shape=[num_labels]))
conv_1 = tf.nn.conv2d(data, layer1_weights, [1, 2, 2, 1], padding='SAME')
hidden_1 = tf.nn.relu(conv_1 + layer1_biases)
pool_1 = tf.nn.max_pool(hidden_1,ksize = [1,2,2,1], strides= [1,2,2,1],padding ='SAME')
conv_2 = tf.nn.conv2d(pool_1, layer2_weights, [1, 2, 2, 1], padding='SAME')
hidden_2 = tf.nn.relu(conv_2 + layer2_biases)
pool_2 = tf.nn.max_pool(hidden_2,ksize = [1,2,2,1], strides= [1,2,2,1],padding ='SAME')
shape = pool_2.get_shape().as_list()
reshape = tf.reshape(pool_2, [shape[0], shape[1] * shape[2] * shape[3]])
hidden_3 = tf.nn.relu(tf.matmul(reshape, layer3_weights) + layer3_biases)
return tf.matmul(hidden_3, layer4_weights) + layer4_biases
# Training computation.
logits = model(tf_train_dataset)
loss = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits,tf_train_labels))
# Optimizer.
optimizer = tf.train.GradientDescentOptimizer(0.001).minimize(loss)
# Predictions for the training, validation, and test data.
train_prediction = tf.nn.softmax(logits)
valid_prediction = tf.nn.softmax(model(tf_valid_dataset))
test_prediction = tf.nn.softmax(model(tf_test_dataset))
num_steps = 201
with tf.Session(graph=graph) as session:
tf.initialize_all_variables().run()
print('Initialized')
for step in range(num_steps):
offset = (step * batch_size) % (train_labels.shape[0] - batch_size)
batch_data = train_dataset[offset:(offset + batch_size), :, :, :]
batch_labels = train_labels[offset:(offset + batch_size), :]
feed_dict = {tf_train_dataset : batch_data, tf_train_labels : batch_labels}
_, l, predictions = session.run(
[optimizer, loss, train_prediction ], feed_dict=feed_dict)
if (step % 50 == 0):
print('Minibatch loss at step %d: %f' % (step, l))
print('Minibatch accuracy: %.1f%%' % accuracy(predictions, batch_labels)
print('Validation accuracy: %.1f%%' % accuracy(
valid_prediction.eval(), valid_labels))
print('Test accuracy: %.1f%%' % accuracy(test_prediction.eval(), test_labels[:,0:9]))
更改測試數據不會影響訓練網絡,舊測試數據的準確性應該穩定。 –
你怎麼能預測在火車組裏沒有的班級? –
是的,我知道如果我刪除未訓練的圖像,它給了我一個很高的準確性,但我的項目是創建新的類,如果在訓練數據集中不可用 – mido