load_weights Keras模型错误

我对CNN相当新。这是我第一次使用keras，tensorflow等。我有一个load_weights函数的问题。我已经培训了CNN（cifar100），现在我想通过加载它的权重并评估它来测试它。load_weights Keras模型错误

这是错误，我得到的堆栈回溯：

Traceback (most recent call last): 

    File "<ipython-input-17-247d6312ea1b>", line 1, in <module> 
    runfile('/home/nikola/Desktop/cifar100-Version2.py', wdir='/home/nikola/Desktop') 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/spyder/utils/site/sitecustomize.py", line 866, in runfile 
    execfile(filename, namespace) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/spyder/utils/site/sitecustomize.py", line 94, in execfile 
    builtins.execfile(filename, *where) 

    File "/home/nikola/Desktop/cifar100-Version2.py", line 80, in <module> 
    model.load_weights('cifar100_best_accuracy.hdf5') 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/keras/engine/topology.py", line 2520, in load_weights 
    self.load_weights_from_hdf5_group(f) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/keras/engine/topology.py", line 2605, in load_weights_from_hdf5_group 
    K.batch_set_value(weight_value_tuples) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/keras/backend/tensorflow_backend.py", line 1045, in batch_set_value 
    assign_op = x.assign(assign_placeholder) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/variables.py", line 575, in assign 
    return state_ops.assign(self._variable, value, use_locking=use_locking) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/gen_state_ops.py", line 47, in assign 
    use_locking=use_locking, name=name) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/op_def_library.py", line 759, in apply_op 
    op_def=op_def) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 2242, in create_op 
    set_shapes_for_outputs(ret) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 1617, in set_shapes_for_outputs 
    shapes = shape_func(op) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 1568, in call_with_requiring 
    return call_cpp_shape_fn(op, require_shape_fn=True) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/common_shapes.py", line 610, in call_cpp_shape_fn 
    debug_python_shape_fn, require_shape_fn) 

    File "/home/nikola/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/common_shapes.py", line 675, in _call_cpp_shape_fn_impl 
    raise ValueError(err.message) 

ValueError: Dimension 0 in both shapes must be equal, but are 3 and 32 for 'Assign_11' (op: 'Assign') with input shapes: [3,3,3,32], [32,3,3,3].

我试图延长keras cifar10代码cifar100代码。我设法训练它，但我也想评估它。通过评估，我可以确定我的模型是否好，它的得分是多少。

这是我的代码：

from __future__ import print_function 
from keras.datasets import cifar100 
from keras.preprocessing.image import ImageDataGenerator 
from keras.callbacks import ModelCheckpoint 
from keras.models import Sequential 
from keras.layers import Dense, Dropout, Activation, Flatten 
from keras.layers import Convolution2D, MaxPooling2D 
from keras.utils import np_utils, generic_utils 
from six.moves import range 

#import numpy as np 
#import matplotlib.pyplot as plt 

batch_size = 32 
nb_classes = 100 

classes = [...100 classes...`enter code here`] 

test_only =True; 
save_weights = True; 

nb_epoch = 200 
data_augmentation = True 

# input image dimensions 
img_rows, img_cols = 32, 32 
# The CIFAR10 images are RGB. 
img_channels = 3 

# The data, shuffled and split between train and test sets: 
(X_train, y_train), (X_test, y_test) = cifar100.load_data() 
print('X_train shape:', X_train.shape) 
print(X_train.shape[0], 'train samples') 
print(X_test.shape[0], 'test samples') 

# Convert class vectors to binary class matrices. 
Y_train = np_utils.to_categorical(y_train, nb_classes) 
Y_test = np_utils.to_categorical(y_test, nb_classes) 

model = Sequential() 

model.add(Convolution2D(32, 3, 3, border_mode='same', 
         input_shape=X_train.shape[1:])) 
model.add(Activation('relu')) 
model.add(Convolution2D(32, 3, 3)) 
model.add(Activation('relu')) 
model.add(MaxPooling2D(pool_size=(2, 2))) 
model.add(Dropout(0.25)) 

model.add(Convolution2D(64, 3, 3, border_mode='same')) 
model.add(Activation('relu')) 
model.add(Convolution2D(64, 3, 3)) 
model.add(Activation('relu')) 
model.add(MaxPooling2D(pool_size=(2, 2))) 
model.add(Dropout(0.25)) 

model.add(Flatten()) 
model.add(Dense(512)) 
model.add(Activation('relu')) 
model.add(Dropout(0.5)) 
model.add(Dense(nb_classes)) 
model.add(Activation('softmax')) 

# Let's train the model using RMSprop 
model.compile(loss='categorical_crossentropy', 
       optimizer='rmsprop', 
       metrics=['accuracy']) 




if test_only: 
    model.load_weights('cifar100_best_accuracy.hdf5') 

X_train = X_train.astype('float32') 
X_test = X_test.astype('float32') 
X_train /= 255 
X_test /= 255 

if not data_augmentation: 
    print('Not using data augmentation.') 
    model.fit(X_train, Y_train, 
       batch_size=batch_size, 
       nb_epoch=nb_epoch, 
       validation_data=(X_test, Y_test), 
       shuffle=True) 
    score = model.evaluate(X_test, Y_test, batch_size = batch_size) 
    print('Test score:', score) 
else: 
    print('Using real-time data augmentation.') 
    # This will do preprocessing and realtime data augmentation: 
    datagen = ImageDataGenerator(
     featurewise_center=False, # set input mean to 0 over the dataset 
     samplewise_center=False, # set each sample mean to 0 
     featurewise_std_normalization=False, # divide inputs by std of the dataset 
     samplewise_std_normalization=False, # divide each input by its std 
     zca_whitening=False, # apply ZCA whitening 
     rotation_range=0, # randomly rotate images in the range (degrees, 0 to 180) 
     width_shift_range=0.1, # randomly shift images horizontally (fraction of total width) 
     height_shift_range=0.1, # randomly shift images vertically (fraction of total height) 
     horizontal_flip=True, # randomly flip images 
     vertical_flip=False) # randomly flip images 

    # Compute quantities required for featurewise normalization 
    # (std, mean, and principal components if ZCA whitening is applied). 
    datagen.fit(X_train) 


    model_check_point = ModelCheckpoint('cifar100_best_accuracy.hdf5', monitor='acc', verbose=0, save_best_only=True, save_weights_only=False, mode='auto') 


    # Fit the model on the batches generated by datagen.flow(). 
    model.fit_generator(datagen.flow(X_train, Y_train, 
         batch_size=batch_size), 
         samples_per_epoch=X_train.shape[0], 
         nb_epoch=nb_epoch, 
         callbacks=[model_check_point], 
         validation_data=(X_test, Y_test))

来源

2016-12-29 Nikola Berdić

看起来像是某处形状不匹配。我认为诀窍是在形状中设置正确的顺序：batch_size，图像高度，图像大小和通道数量。我认为你需要调试一下才能找出问题所在。如果我是你，我会减少模型到1层模型，以简化调试。 –

我已经在一台PC（Windows 10）上训练过CNN，并且我试图在另一台PC上的Ubuntu上load_weights。这两者之间的任何不匹配是否会使我成为问题？ –

我想不出任何。你能否在同一台电脑上加载（Windows 10）？ –

要保存的模型，然后加载回作为权数，即重新训练模型之后。

首先，修复脚本以仅保存权重，将其加载回来并检查问题是否存在。

来源

2017-05-18 04:55:27 bigdata2

load_weights Keras模型错误

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