官网实例详解4.34(mnist_transfer_cnn.py)-keras学习笔记

迁移学习实例

Keras实例目录

代码注释

'''Transfer learning toy example.
迁移学习实例
1 - Train a simple convnet on the MNIST dataset the first 5 digits [0..4].
1 - 基于MINIST数据集,训练简单卷积网络,前5个数字[0..4].
2 - Freeze convolutional layers and fine-tune dense layers
   for the classification of digits [5..9].
2 - 为[5..9]数字分类,冻结卷积层并微调全连接层

Get to 99.8% test accuracy after 5 epochs
for the first five digits classifier
and 99.2% for the last five digits after transfer + fine-tuning.
5个周期后,前5个数字分类测试准确率99.8% ,同时通过迁移+微调,后5个数字测试准确率99.2%
'''

from __future__ import print_function

import datetime
import keras
from keras.datasets import mnist
from keras.models import Sequential
from keras.layers import Dense, Dropout, Activation, Flatten
from keras.layers import Conv2D, MaxPooling2D
from keras import backend as K

now = datetime.datetime.now

batch_size = 128
num_classes = 5
epochs = 5

# input image dimensions
# 输入图像维度
img_rows, img_cols = 28, 28
# number of convolutional filters to use
# 使用的卷积过滤器数量
filters = 32
# size of pooling area for max pooling
# 最大值池化的池化区域大小
pool_size = 2
# convolution kernel size
# 卷积核大小
kernel_size = 3

if K.image_data_format() == 'channels_first':
    input_shape = (1, img_rows, img_cols)
else:
    input_shape = (img_rows, img_cols, 1)


def train_model(model, train, test, num_classes):
    x_train = train[0].reshape((train[0].shape[0],) + input_shape)
    x_test = test[0].reshape((test[0].shape[0],) + input_shape)
    x_train = x_train.astype('float32')
    x_test = x_test.astype('float32')
    x_train /= 255
    x_test /= 255
    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
    # 类别向量转为多分类矩阵
    y_train = keras.utils.to_categorical(train[1], num_classes)
    y_test = keras.utils.to_categorical(test[1], num_classes)

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

    t = now()
    model.fit(x_train, y_train,
              batch_size=batch_size,
              epochs=epochs,
              verbose=1,
              validation_data=(x_test, y_test))
    print('Training time: %s' % (now() - t))
    score = model.evaluate(x_test, y_test, verbose=0)
    print('Test score:', score[0])
    print('Test accuracy:', score[1])


# the data, shuffled and split between train and test sets
# 筛选(数据顺序打乱)、划分训练集和测试集
(x_train, y_train), (x_test, y_test) = mnist.load_data()

# create two datasets one with digits below 5 and one with 5 and above
# 创建2个数据集,一个数字小于5,另一个数学大于等与5
x_train_lt5 = x_train[y_train < 5]
y_train_lt5 = y_train[y_train < 5]
x_test_lt5 = x_test[y_test < 5]
y_test_lt5 = y_test[y_test < 5]

x_train_gte5 = x_train[y_train >= 5]
y_train_gte5 = y_train[y_train >= 5] - 5
x_test_gte5 = x_test[y_test >= 5]
y_test_gte5 = y_test[y_test >= 5] - 5

# define two groups of layers: feature (convolutions) and classification (dense)
# 定义2组层:特征(卷积)和分类(全连接)
feature_layers = [
    Conv2D(filters, kernel_size,
           padding='valid',
           input_shape=input_shape),
    Activation('relu'),
    Conv2D(filters, kernel_size),
    Activation('relu'),
    MaxPooling2D(pool_size=pool_size),
    Dropout(0.25),
    Flatten(),
]

classification_layers = [
    Dense(128),
    Activation('relu'),
    Dropout(0.5),
    Dense(num_classes),
    Activation('softmax')
]

# create complete model
# 创建完整模型
model = Sequential(feature_layers + classification_layers)

# train model for 5-digit classification [0..4]
# 为5数字分类[0..4]训练模型
train_model(model,
            (x_train_lt5, y_train_lt5),
            (x_test_lt5, y_test_lt5), num_classes)

# freeze feature layers and rebuild model
# 冻结特征层并重建模型
for l in feature_layers:
    l.trainable = False

# transfer: train dense layers for new classification task [5..9]
# 迁移:训练全连接层为[5..9]分类任务
train_model(model,
            (x_train_gte5, y_train_gte5),
            (x_test_gte5, y_test_gte5), num_classes)

代码执行



Keras详细介绍

英文:https://keras.io/

中文:http://keras-cn.readthedocs.io/en/latest/

实例下载

https://github.com/keras-team/keras

https://github.com/keras-team/keras/tree/master/examples

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转载自blog.csdn.net/wyx100/article/details/80789203
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