试试使用 set_weights。
例如:
from __future__ import print_function
import numpy as np
np.random.seed(1234)
from keras.layers import Input
from keras.layers.convolutional import Convolution2D
from keras.models import Model
print("Building Model...")
inp = Input(shape=(1,None,None))
x = Convolution2D(1, 3, 3, border_mode='same', init='normal',bias=False)(inp)
output = Convolution2D(1, 3, 3, border_mode='same', init='normal',bias=False)(x)
model_network = Model(input=inp, output=output)
w = np.asarray([
[[[
[0,0,0],
[0,2,0],
[0,0,0]
]]]
])
for layer_i in range(len(model_network.layers)):
print (model_network.layers[layer_i])
for layer_i in range(1,len(model_network.layers)):
model_network.layers[layer_i].set_weights(w)
input_mat = np.asarray([
[[
[1.,2.,3.,10.],
[4.,5.,6.,11.],
[7.,8.,9.,12.]
]]
])
print("Input:")
print(input_mat)
print("Output:")
print(model_network.predict(input_mat))
w2 = np.asarray([
[[[
[0,0,0],
[0,3,0],
[0,0,0]
]]]
])
for layer_i in range(1,len(model_network.layers)):
model_network.layers[layer_i].set_weights(w2)
print("Output:")
print(model_network.predict(input_mat))
建立一个模型,例如,使用两个卷积层
print("Building Model...")
inp = Input(shape=(1,None,None))
x = Convolution2D(1, 3, 3, border_mode='same', init='normal',bias=False)(inp)
output = Convolution2D(1, 3, 3, border_mode='same', init='normal',bias=False)(x)
model_network = Model(input=inp, output=output)
然后定义您的权重(我使用简单的w,但如果您想要,可以使用np.random.uniform或任何其他方法)
w = np.asarray([
[[[
[0,0,0],
[0,2,0],
[0,0,0]
]]]
])
看一下模型内部的层是什么
for layer_i in range(len(model_network.layers)):
print (model_network.layers[layer_i])
为每个卷积层设置权重(你会发现第一层实际上是输入层,你不想改变它,所以范围从1而不是0开始)。
for layer_i in range(1,len(model_network.layers)):
model_network.layers[layer_i].set_weights(w)
生成一些测试输入并预测模型的输出
input_mat = np.asarray([
[[
[1.,2.,3.,10.],
[4.,5.,6.,11.],
[7.,8.,9.,12.]
]]
])
print("Output:")
print(model_network.predict(input_mat))
你可以再次更改它,然后检查输出:
w2 = np.asarray([
[[[
[0,0,0],
[0,3,0],
[0,0,0]
]]]
])
for layer_i in range(1,len(model_network.layers)):
model_network.layers[layer_i].set_weights(w2)
print("Output:")
print(model_network.predict(input_mat))
示例输出:
Using Theano backend.
Building Model...
<keras.engine.topology.InputLayer object at 0x7fc0c619fd50>
<keras.layers.convolutional.Convolution2D object at 0x7fc0c6166250>
<keras.layers.convolutional.Convolution2D object at 0x7fc0c6150a10>
Weights after change:
[array([[[[ 0., 0., 0.],
[ 0., 2., 0.],
[ 0., 0., 0.]]]], dtype=float32)]
Input:
[[[[ 1. 2. 3. 10.]
[ 4. 5. 6. 11.]
[ 7. 8. 9. 12.]]]]
Output:
[[[[ 4. 8. 12. 40.]
[ 16. 20. 24. 44.]
[ 28. 32. 36. 48.]]]]
Output:
[[[[ 9. 18. 27. 90.]
[ 36. 45. 54. 99.]
[ 63. 72. 81. 108.]]]]
通过查看.layers,您可以看到第一层是输入层,其他层是卷积层。
weights = model.get_weights()
,model.compile(args)
,model.fit(args)
,model.set_weights(weights)
。 - BallpointBenweights = model.get_weights()
这样的事情;reset_model = lambda model: model.set_weights(weights)
,这样我以后只需要调用reset_model(model)
即可。 - Andrew