我正在学习使用Keras创建图像分类器的教程,链接如下:https://blog.keras.io/building-powerful-image-classification-models-using-very-little-data.html。训练模型后,我将其保存到文件中,并在下面的测试脚本中重新加载到模型中。
当我使用一张以前从未见过的图片对模型进行评估时,出现以下异常:
错误:
当我使用一张以前从未见过的图片对模型进行评估时,出现以下异常:
错误:
Traceback (most recent call last):
File "test_classifier.py", line 48, in <module>
score = model.evaluate(x, y, batch_size=16)
File "/Library/Python/2.7/site-packages/keras/models.py", line 655, in evaluate
sample_weight=sample_weight)
File "/Library/Python/2.7/site-packages/keras/engine/training.py", line 1131, in evaluate
batch_size=batch_size)
File "/Library/Python/2.7/site-packages/keras/engine/training.py", line 959, in _standardize_user_data
exception_prefix='model input')
File "/Library/Python/2.7/site-packages/keras/engine/training.py", line 108, in standardize_input_data
str(array.shape))
Exception: Error when checking model input: expected convolution2d_input_1 to have shape (None, 3, 150, 150) but got array with shape (1, 3, 150, 198)`
问题出在我训练的模型上还是在我调用评估方法时有问题?
代码:
from keras.preprocessing.image import ImageDataGenerator
from keras.models import Sequential
from keras.layers import Convolution2D, MaxPooling2D
from keras.layers import Activation, Dropout, Flatten, Dense
from keras.preprocessing.image import ImageDataGenerator, array_to_img, img_to_array, load_img
import numpy as np
img_width, img_height = 150, 150
train_data_dir = 'data/train'
validation_data_dir = 'data/validation'
nb_train_samples = 2000
nb_validation_samples = 800
nb_epoch = 5
model = Sequential()
model.add(Convolution2D(32, 3, 3, input_shape=(3, img_width, img_height)))
model.add(Activation('relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Convolution2D(32, 3, 3))
model.add(Activation('relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Convolution2D(64, 3, 3))
model.add(Activation('relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Flatten())
model.add(Dense(64))
model.add(Activation('relu'))
model.add(Dropout(0.5))
model.add(Dense(1))
model.add(Activation('sigmoid'))
model.compile(loss='binary_crossentropy',
optimizer='rmsprop',
metrics=['accuracy'])
model.load_weights('first_try.h5')
img = load_img('data/test2/ferrari.jpeg')
x = img_to_array(img) # this is a Numpy array with shape (3, 150, 150)
x = x.reshape( (1,) + x.shape ) # this is a Numpy array with shape (1, 3, 150, 150)
y = np.array([0])
score = model.evaluate(x, y, batch_size=16)`
x = img_to_array(img) # 这是一个形状为 (3, 150, 150) 的Numpy数组 x = x.reshape( (1,) + x.shape ) # 这是一个形状为 (1, 3, 150, 150) 的Numpy数组
但是错误信息说的不一样。这并不是一个完整的答案,但是为了调试,请尝试在评估模型之前输出你的输入形状。 - user6684101