Tensorflow 如果使用keras在较小尺寸的图像上训练模型,我如何预测较大尺寸的图像
我在tensorflow后端使用下面的keras代码来分类狗和猫之间的区别。它没有预测任何图像高于800x800图像。如何预测或调整图像大小以预测hd图像 训练代码:Tensorflow 如果使用keras在较小尺寸的图像上训练模型,我如何预测较大尺寸的图像,tensorflow,keras,Tensorflow,Keras,我在tensorflow后端使用下面的keras代码来分类狗和猫之间的区别。它没有预测任何图像高于800x800图像。如何预测或调整图像大小以预测hd图像 训练代码: # Importing the Keras libraries and packages from keras.models import Sequential from keras.layers import Convolution2D from keras.layers import MaxPooling2D from ker
# Importing the Keras libraries and packages
from keras.models import Sequential
from keras.layers import Convolution2D
from keras.layers import MaxPooling2D
from keras.layers import Flatten
from keras.layers import Dense
from keras.preprocessing.image import load_img, img_to_array
from keras.models import model_from_json
from scipy.misc import imresize
# Initialising the CNN
classifier = Sequential()
# Step 1 - Convolution
classifier.add(Convolution2D(32, 3, 3, input_shape = (64, 64, 3), activation = 'relu'))
# Step 2 - Pooling
classifier.add(MaxPooling2D(pool_size = (2, 2)))
# Adding a second convolutional layer
classifier.add(Convolution2D(32, 3, 3, activation = 'relu'))
classifier.add(MaxPooling2D(pool_size = (2, 2)))
# Step 3 - Flattening
classifier.add(Flatten())
# Step 4 - Full connection
classifier.add(Dense(output_dim = 128, activation = 'relu'))
classifier.add(Dense(output_dim = 1, activation = 'sigmoid'))
# Compiling the CNN
classifier.compile(optimizer = 'adam', loss = 'binary_crossentropy', metrics = ['accuracy'])
# Part 2 - Fitting the CNN to the images
from keras.preprocessing.image import ImageDataGenerator
train_datagen = ImageDataGenerator(rescale = 1./255,
shear_range = 0.2,
zoom_range = 0.2,
horizontal_flip = True)
test_datagen = ImageDataGenerator(rescale = 1./255)
training_set = train_datagen.flow_from_directory('dataset/training_set',
target_size = (64, 64),
batch_size = 32,
class_mode = 'binary')
test_set = test_datagen.flow_from_directory('dataset/test_set',
target_size = (64, 64),
batch_size = 32,
class_mode = 'binary')
classifier.fit_generator(
training_set,
samples_per_epoch=80,
nb_epoch=100,
validation_data=test_set,
nb_val_samples=2000
)
print(training_set.class_indices)
from keras.models import model_from_json
json_file = open('model.json', 'r')
model_json = json_file.read()
json_file.close()
model = model_from_json(model_json)
# load weights into new model
model.load_weights("model.h5")
# evaluate loaded model on test data
model.compile(optimizer = 'adam', loss = 'binary_crossentropy', metrics = ['accuracy'])
import shutil
import matplotlib.pyplot as plt
import requests
url = raw_input("Please enter the image url/link")
response = requests.get(url, stream=True)
with open('test.jpg', 'wb') as out_file:
shutil.copyfileobj(response.raw, out_file)
from keras.preprocessing import image
import numpy as np
test = image.load_img('test.jpg')
test = image.img_to_array(test)
test = np.expand_dims(test, axis=0)
result = model.predict(test)
if result[0][0] == 1:
prediction = 'dog'
print prediction
else:
prediction = 'cat'
print prediction
要预测的代码:
# Importing the Keras libraries and packages
from keras.models import Sequential
from keras.layers import Convolution2D
from keras.layers import MaxPooling2D
from keras.layers import Flatten
from keras.layers import Dense
from keras.preprocessing.image import load_img, img_to_array
from keras.models import model_from_json
from scipy.misc import imresize
# Initialising the CNN
classifier = Sequential()
# Step 1 - Convolution
classifier.add(Convolution2D(32, 3, 3, input_shape = (64, 64, 3), activation = 'relu'))
# Step 2 - Pooling
classifier.add(MaxPooling2D(pool_size = (2, 2)))
# Adding a second convolutional layer
classifier.add(Convolution2D(32, 3, 3, activation = 'relu'))
classifier.add(MaxPooling2D(pool_size = (2, 2)))
# Step 3 - Flattening
classifier.add(Flatten())
# Step 4 - Full connection
classifier.add(Dense(output_dim = 128, activation = 'relu'))
classifier.add(Dense(output_dim = 1, activation = 'sigmoid'))
# Compiling the CNN
classifier.compile(optimizer = 'adam', loss = 'binary_crossentropy', metrics = ['accuracy'])
# Part 2 - Fitting the CNN to the images
from keras.preprocessing.image import ImageDataGenerator
train_datagen = ImageDataGenerator(rescale = 1./255,
shear_range = 0.2,
zoom_range = 0.2,
horizontal_flip = True)
test_datagen = ImageDataGenerator(rescale = 1./255)
training_set = train_datagen.flow_from_directory('dataset/training_set',
target_size = (64, 64),
batch_size = 32,
class_mode = 'binary')
test_set = test_datagen.flow_from_directory('dataset/test_set',
target_size = (64, 64),
batch_size = 32,
class_mode = 'binary')
classifier.fit_generator(
training_set,
samples_per_epoch=80,
nb_epoch=100,
validation_data=test_set,
nb_val_samples=2000
)
print(training_set.class_indices)
from keras.models import model_from_json
json_file = open('model.json', 'r')
model_json = json_file.read()
json_file.close()
model = model_from_json(model_json)
# load weights into new model
model.load_weights("model.h5")
# evaluate loaded model on test data
model.compile(optimizer = 'adam', loss = 'binary_crossentropy', metrics = ['accuracy'])
import shutil
import matplotlib.pyplot as plt
import requests
url = raw_input("Please enter the image url/link")
response = requests.get(url, stream=True)
with open('test.jpg', 'wb') as out_file:
shutil.copyfileobj(response.raw, out_file)
from keras.preprocessing import image
import numpy as np
test = image.load_img('test.jpg')
test = image.img_to_array(test)
test = np.expand_dims(test, axis=0)
result = model.predict(test)
if result[0][0] == 1:
prediction = 'dog'
print prediction
else:
prediction = 'cat'
print prediction
根据Keras文档,您可以使用以下方法指定目标尺寸:
test = image.load_img('test.jpg', target_size=(224, 224))
例如,请参阅。如果您使用的是TensorFlow后端,最好的选择可能是编写一个调用。否则,您可以在将数据输入到模型之前调整数据大小,例如使用SciPy。我不介意再次将输入设置为“无”来训练模型,但有没有方法不用重新训练就进行预测?没错,看看(因为函数似乎不在文档中的任何地方)它确实执行了调整大小,而且,更重要的是,该函数返回一个,因此原则上,在调用
img\u to\u array
之前,您可以对其执行PIL支持的任何操作。我得到以下错误:ValueError:检查时出错:预期conv2d\u 7\u输入具有形状(无,64,64,3),但获得具有形状(1,224,224,3)的数组只需将目标大小更改为64,64@convolutionBoy对它一直是64,64,但无法预测更大的图像抱歉,我的意思是你需要将更大的图像缩小到64,64。这是唯一的解决办法。