Keras 2.0版本运行

Keras 2.0版本运行demo出错：

d:\program\python3\lib\site-packages\ipykernel_launcher.py:8: UserWarning: Update your `Conv2D` call to the Keras 2 API: `Conv2D(32, (3, 3), activation="relu")`

 

使用Keras时用到了卷积层Convolution2D( )以及Model.fit( )：

x = Convolution2D(8, 3, 3, activation='relu', border_mode='same')(x)
Model.fit(x_train, x_train, nb_epoch=10, batch_size=256, shuffle=True, validation_data=(x_test, x_test))

遇到了以下错误：

UserWarning: Update your `Conv2D` call to the Keras 2 API: `Conv2D(1, (3, 3), padding="same", activation="sigmoid")`
decoded = Convolution2D(1, 3, 3, activation='sigmoid', border_mode='same')(x)

在查看了github上的Keras 2.0发行说明后，发现这是从Keras 1到Keras 2发生的变化．

此处涉及到的有：
Convolution* 层被从新命名 Conv*　；
border_mode - > padding　；
nb_epoch - > epochs；
kernel_size能够设置为一个整数，例如Conv2D(10, 3)至关于Conv2D(10, (3, 3))；

所以，

x = Convolution2D(8, 3, 3, activation='relu', border_mode='same')(x)
Model.fit(x_train, x_train, nb_epoch=10, batch_size=256, shuffle=True, validation_data=(x_test, x_test))

改成：

x = Conv2D(8, 3, activation='relu', padding='same')(x)
Model.fit(x_train, x_train, epochs=10, batch_size=256, shuffle=True, validation_data=(x_test, x_test))

 

修正后版本：

from keras.models import *
from keras.layers import *
import sys

input_tensor = Input((height, width, 3))
x = input_tensor
for i in range(4):
    x = Conv2D(32*2**i, 3, activation='relu')(x)
    x = Conv2D(32*2**i, 3, activation='relu')(x)
    x = MaxPooling2D((2, 2))(x)

x = Flatten()(x)
x = Dropout(0.25)(x)
x = [Dense(n_class, activation='softmax', name='c%d'%(i+1))(x) for i in range(4)]
model = Model(inputs=input_tensor, outputs=x)

model.compile(loss='categorical_crossentropy',
              optimizer='adadelta',
              metrics=['accuracy'])

　　

其余更多变化参见：Keras 2.0发行说明
原文：https://blog.csdn.net/akadiao/article/details/80405766

 

ImportError: No module named 'keras.utils.visualize_util'

一、Q：ImportError: No module named visualize_util

A：自从2017年以后，visualize_util 变成vis_utils, 而且plot函数从新命名成plot_model.

down vote accepted

You will have to either fix the code manually, or downgrade Keras.

By looking at the commit history of that module, you can see that it was renamed on February 28, 2017 from visualize_util to vis_utils. The plot function was also renamed to plot_model.

 

 

python 版本问题

Traceback (most recent call last):
  File “<pyshell#32>”, line 1, in <module>
    f.next()
AttributeError: ‘generator’ object has no attribute ‘next’

缘由是在python 3.x中 generator（有yield关键字的函数则会被识别为generator函数）中的next变为__next__了,next是python 3.x之前版本中的方法

修改成下面这样运行正常f=fab(5)f.__next__()