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import random
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import os
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import numpy as np
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from sklearn.model_selection import train_test_split
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from keras.preprocessing.image import ImageDataGenerator
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from keras.models import Sequential
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from keras.layers import Dense, Dropout, Activation, Flatten
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from keras.layers import Convolution2D, MaxPooling2D
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from keras.optimizers import SGD
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from keras.utils import np_utils
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from keras.models import load_model
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from keras import backend as K
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from load_dataset import load_dataset, resize_image
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IMAGE_SIZE = 128
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class Dataset:
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def __init__(self, path_name):
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# 训练集
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self.train_images = None
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self.train_labels = None
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# 验证集
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self.valid_images = None
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self.valid_labels = None
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# 测试集
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self.test_images = None
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self.test_labels = None
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# 数据集加载路径
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self.path_name = path_name
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# 图像种类
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self.user_num = len(os.listdir(path_name))
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# 当前库采用的维度顺序
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self.input_shape = None
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# 加载数据集并按照交叉验证的原则划分数据集并进行相关预处理工作
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def load(self, img_rows= IMAGE_SIZE, img_cols= IMAGE_SIZE, img_channels=3):
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# 数据种类
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nb_classes = self.user_num
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# 加载数据集到内存
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images, labels = load_dataset(self.path_name)
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train_images, valid_images, train_labels, valid_labels = train_test_split(images, labels, test_size=0.3,
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random_state=random.randint(0, 100))
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_, test_images, _, test_labels = train_test_split(images, labels, test_size=0.5,
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random_state=random.randint(0, 100))
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# 当前的维度顺序如果为'th'，则输入图片数据时的顺序为：channels,rows,cols，否则:rows,cols,channels
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# 这部分代码就是根据keras库要求的维度顺序重组训练数据集
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if K.image_data_format() == "channels_first":
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train_images = train_images.reshape(train_images.shape[0], img_channels, img_rows, img_cols)
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valid_images = valid_images.reshape(valid_images.shape[0], img_channels, img_rows, img_cols)
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test_images = test_images.reshape(test_images.shape[0], img_channels, img_rows, img_cols)
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self.input_shape = (img_channels, img_rows, img_cols)
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else:
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train_images = train_images.reshape(train_images.shape[0], img_rows, img_cols, img_channels)
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valid_images = valid_images.reshape(valid_images.shape[0], img_rows, img_cols, img_channels)
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test_images = test_images.reshape(test_images.shape[0], img_rows, img_cols, img_channels)
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self.input_shape = (img_rows, img_cols, img_channels)
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# 输出训练集、验证集、测试集的数量
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print(train_images.shape[0], 'train samples')
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print(valid_images.shape[0], 'valid samples')
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print(test_images.shape[0], 'test samples')
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# 类别标签进行one-hot编码使其向量化，在这里我们的类别只有两种，经过转化后标签数据变为二维
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train_labels = np_utils.to_categorical(train_labels, nb_classes)
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valid_labels = np_utils.to_categorical(valid_labels, nb_classes)
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test_labels = np_utils.to_categorical(test_labels, nb_classes)
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# 像素数据浮点化以便归一化
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train_images = train_images.astype('float32')
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valid_images = valid_images.astype('float32')
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test_images = test_images.astype('float32')
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# 将其归一化,图像的各像素值归一化到0~1区间
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train_images /= 255
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valid_images /= 255
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test_images /= 255
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#保存
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self.train_images = train_images
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self.valid_images = valid_images
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self.test_images = test_images
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self.train_labels = train_labels
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self.valid_labels = valid_labels
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self.test_labels = test_labels
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# CNN网络模型类
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class Model:
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def __init__(self):
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self.model = None
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# 建立模型
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def build_model(self, dataset, nb_classes):
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# 构建一个空的网络模型，它是一个线性堆叠模型，各神经网络层会被顺序添加，专业名称为序贯模型或线性堆叠模型
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self.model = Sequential()
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# 以下代码将顺序添加CNN网络需要的各层，一个add就是一个网络层
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self.model.add(Convolution2D(32, (3, 3), padding='same',input_shape=dataset.input_shape)) # 1 2维卷积层
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self.model.add(Activation('relu')) # 2 激活函数层
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self.model.add(Convolution2D(32, (3, 3))) # 3 2维卷积层
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self.model.add(Activation('relu')) # 4 激活函数层
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self.model.add(MaxPooling2D(pool_size=(2, 2))) # 5 池化层
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self.model.add(Dropout(0.25)) # 6 Dropout层
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self.model.add(Convolution2D(64, (3, 3), padding='same')) # 7 2维卷积层
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self.model.add(Activation('relu')) # 8 激活函数层
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self.model.add(Convolution2D(64, (3, 3))) # 9 2维卷积层
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self.model.add(Activation('relu')) # 10 激活函数层
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self.model.add(MaxPooling2D(pool_size=(2, 2))) # 11 池化层
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self.model.add(Dropout(0.25)) # 12 Dropout层
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self.model.add(Flatten()) # 13 Flatten层
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self.model.add(Dense(512)) # 14 Dense层,又被称作全连接层
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self.model.add(Activation('sigmoid')) # 15 激活函数层
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self.model.add(Dropout(0.5)) # 16 Dropout层
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self.model.add(Dense(nb_classes)) # 17 Dense层
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self.model.add(Activation('softmax')) # 18 分类层，输出最终结果
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# 输出模型概况
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self.model.summary()
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# 训练模型
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def train (self, dataset, batch_size=5, nb_epoch=10, data_augmentation=True):
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sgd = SGD(lr=0.01, decay=1e-6,
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momentum=0.99, nesterov=True) # 采用SGD+momentum的优化器进行训练，首先生成一个优化器对象
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#adam = Adam(lr=0.001, beta_1=0.9, beta_2=0.99, epsilon=1e-08, decay=0.0)
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#使用adam优化器
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self.model.compile(loss = 'categorical_crossentropy',
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optimizer = 'sgd', metrics = ['accuracy'])
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# 完成实际的模型配置工作
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# 不使用数据提升，所谓的提升就是从我们提供的训练数据中利用旋转、翻转、加噪声等方法创造新的
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# 训练数据，有意识的提升训练数据规模，增加模型训练量
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if not data_augmentation:
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self.model.fit(dataset.train_images,
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dataset.train_labels,
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batch_size=batch_size,
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epochs=nb_epoch,
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shuffle=True)
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# 使用实时数据提升
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else:
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# 定义数据生成器用于数据提升，其返回一个生成器对象datagen，datagen每被调用一
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# 次其生成一组数据（顺序生成），节省内存，其实就是python的数据生成器
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datagen = ImageDataGenerator(
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featurewise_center=False, # 是否使输入数据去中心化（均值为0），
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samplewise_center=False, # 是否使输入数据的每个样本均值为0
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featurewise_std_normalization=False, # 是否数据标准化（输入数据除以数据集的标准差）
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samplewise_std_normalization=False, # 是否将每个样本数据除以自身的标准差
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zca_whitening=False, # 是否对输入数据施以ZCA白化
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rotation_range=20, # 数据提升时图片随机转动的角度(范围为0～180)
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width_shift_range=0.2, # 数据提升时图片水平偏移的幅度（单位为图片宽度的占比，0~1之间的浮点数）
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height_shift_range=0.2, # 同上，只不过这里是垂直
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horizontal_flip=True, # 是否进行随机水平翻转
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vertical_flip=False) # 是否进行随机垂直翻转
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# 计算整个训练样本集的数量以用于特征值归一化、ZCA白化等处理
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datagen.fit(dataset.train_images)
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# 利用生成器开始训练模型
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self.model.fit_generator(datagen.flow(dataset.train_images, dataset.train_labels,
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batch_size=batch_size),
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steps_per_epoch=np.ceil(dataset.train_images.shape[0]/batch_size),
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nb_epoch=nb_epoch,
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validation_data=(dataset.train_images, dataset.train_labels),
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)
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MODEL_PATH = './aggregate.face.model.h5'
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def save_model(self, file_path=MODEL_PATH):
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self.model.save(file_path)
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def load_model(self, file_path=MODEL_PATH):
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self.model = load_model(file_path)
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def evaluate(self, dataset):
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score = self.model.evaluate(dataset.test_images, dataset.test_labels, verbose=1)
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print("%s: %.2f%%" % (self.model.metrics_names[1], score[1] * 100))
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# 识别人脸
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def face_predict(self, image):
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# 依然是根据后端系统确定维度顺序
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if K.image_data_format() == "channels_first" and image.shape != (1, 3, IMAGE_SIZE, IMAGE_SIZE):
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image = resize_image(image)
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# 尺寸必须与训练集一致都应该是IMAGE_SIZE x IMAGE_SIZE
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image = image.reshape((1, 3, IMAGE_SIZE, IMAGE_SIZE))
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# 与模型训练不同，这次只是针对1张图片进行预测
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elif K.image_data_format() == "channels_last" and image.shape != (1, IMAGE_SIZE, IMAGE_SIZE, 3):
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image = resize_image(image)
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image = image.reshape((1, IMAGE_SIZE, IMAGE_SIZE, 3))
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# 浮点并归一化
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image = image.astype('float32')
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image /= 255
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# 给出输入属于各个类别的概率
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result_probability = self.model.predict_proba(image)
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print(result_probability)
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if max(result_probability[0]) >= 0.8:
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result = self.model.predict_classes(image)
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print(result)
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return result[0]
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else:
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return -1
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