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我想实现CNN的分类任务。我想看看每个时代的权重是如何优化的。为此,我需要倒数第二层的值。另外,我会自己编写最后一层和反向传播。请推荐API以及哪些有用的API。如何获得倒数第二层的值卷积神经网络(CNN)?
编辑:我从keras实例加入的码。期待编辑它。 This链接提供了一些线索。我已经提到了需要输出的层。
from __future__ import print_function
from keras.preprocessing import sequence
from keras.models import Sequential
from keras.layers import Dense, Dropout, Activation
from keras.layers import Embedding
from keras.layers import Conv1D, GlobalMaxPooling1D
from keras.datasets import imdb
# set parameters:
max_features = 5000
maxlen = 400
batch_size = 100
embedding_dims = 50
filters = 250
kernel_size = 3
hidden_dims = 250
epochs = 100
print('Loading data...')
(x_train, y_train), (x_test, y_test) = imdb.load_data(num_words=max_features)
print(len(x_train), 'train sequences')
print(len(x_test), 'test sequences')
print('Pad sequences (samples x time)')
x_train = sequence.pad_sequences(x_train, maxlen=maxlen)
x_test = sequence.pad_sequences(x_test, maxlen=maxlen)
print('x_train shape:', x_train.shape)
print('x_test shape:', x_test.shape)
print('Build model...')
model = Sequential()
# we start off with an efficient embedding layer which maps
# our vocab indices into embedding_dims dimensions
model.add(Embedding(max_features,
embedding_dims,
input_length=maxlen))
model.add(Dropout(0.2))
# we add a Convolution1D, which will learn filters
# word group filters of size filter_length:
model.add(Conv1D(filters,
kernel_size,
padding='valid',
activation='relu',
strides=1))
# we use max pooling:
model.add(GlobalMaxPooling1D())
# We add a vanilla hidden layer:
model.add(Dense(hidden_dims))
model.add(Dropout(0.2))
model.add(Activation('relu'))
# We project onto a single unit output layer, and squash it with a sigmoid:
model.add(Dense(1))
model.add(Activation('sigmoid')) #<======== I need output after this.
model.compile(loss='binary_crossentropy',
optimizer='adam',
metrics=['accuracy'])
model.fit(x_train, y_train,
batch_size=batch_size,
epochs=epochs,
validation_data=(x_test, y_test))
我想得到倒数第二层的输出,即在它进入最后一层之前。其实我想用我自己的优化器而不是使用keras提供的任何优化器。我认为倒数第二层的输出是'model.add(Activation('relu'))'层的输出。因此,对于25000个数据点,我想输出为25000 * 250。纠正我我错了某个地方。 –
我的回答的最后一位可以让你做到这一点,请务必使用正确的层'层= model.layers [8]'。那么'layer_output'是一个张量,所以你可以继续添加纯张量流的逻辑。 –
我用我在[问题]提及(https://stackoverflow.com/questions/46885680/why-different-intermediate-layer-ouput-of-cnn-in-keras)的代码,以获取中间层输出。 –