我想定义Lambda层来使用叉积组合特征,然后合并这些模型,就像图中那样,我该怎么做?
测试model_1,从dense层获取128维度,使用pywt
获取两个64维度的特征(cA,cD
),然后返回cA*cD //当然我想要结合两个模型,但首先尝试model_1。
from keras.models import Sequential,Model
from keras.layers import Input,Convolution2D,MaxPooling2D
from keras.layers.core import Dense,Dropout,Activation,Flatten,Lambda
import pywt
def myFunc(x):
(cA, cD) = pywt.dwt(x, 'db1')
# x=x*x
return cA*cD
batch_size=32
nb_classes=3
nb_epoch=20
img_rows,img_cols=200,200
img_channels=1
nb_filters=32
nb_pool=2
nb_conv=3
inputs=Input(shape=(1,img_rows,img_cols))
x=Convolution2D(nb_filters,nb_conv,nb_conv,border_mode='valid',
input_shape=(1,img_rows,img_cols),activation='relu')(inputs)
x=Convolution2D(nb_filters,nb_conv,nb_conv,activation='relu')(x)
x=MaxPooling2D(pool_size=(nb_pool,nb_pool))(x)
x=Dropout(0.25)(x)
x=Flatten()(x)
y=Dense(128,activation='relu')(x)
cross=Lambda(myFunc,output_shape=(64,))(y)
predictions=Dense(nb_classes,activation='softmax')(cross)
model = Model(input=inputs, output=predictions)
model.compile(loss='categorical_crossentropy',optimizer='adadelta',metrics=['accuracy'])
model.fit(X_train,Y_train,batch_size=batch_size,nb_epoch=nb_epoch,
verbose=1,validation_data=(X_test,Y_test))
抱歉,我可以问一个张量相关的问题吗?
import tensorflow as tf
W1 = tf.Variable(np.array([[1,2],[3,4]]))
init = tf.global_variables_initializer()
sess = tf.Session()
sess.run(init)
array = W1.eval(sess)
print (array)
没错!不过,
from keras import backend as K
import numpy as np
kvar=K.variable(np.array([[1,2],[3,4]]))
K.eval(kvar)
print(kvar)
我得到了 <CudaNdarrayType(float32, matrix)>
和 kvar.eval()
。我使用keras,那么如何在keras中获取类似于tensorflow的数组?
karr = kvar.eval()
- Daniel Möllerprint(karr)
,得到了b'CudaNdarray([[ 1. 2.]\n [ 3. 4.]])'
。 - Ting Li