windown+cpu+Keras/Tensorflow+python+yolo3训练自己的数据集

转自：https://blog.csdn.net/Patrick_Lxc/article/details/80615433 感谢博主

第一步：下载VOC2007数据集，把所有文件夹里面的东西删除，保留所有文件夹的名字。

    像这样：

    第二步：把你所有的图片都复制到JPEGImages里面

    像这样：

    第三步：生成Annotations下的文件

    工具：LabelImg ，链接：https://pan.baidu.com/s/1GJFYcFm5Zlb-c6tIJ2N4hw 密码：h0i5

    像这样：

    第四步：生成ImageSets/Main/4个文件。在VOC2007下建个文件test.py，然后运行

    像这样：

    test.py代码：

import os
import random

trainval_percent = 0.1
train_percent = 0.9
xmlfilepath = 'Annotations'
txtsavepath = 'ImageSets\Main'
total_xml = os.listdir(xmlfilepath)

num = len(total_xml)
list = range(num)
tv = int(num * trainval_percent)
tr = int(tv * train_percent)
trainval = random.sample(list, tv)
train = random.sample(trainval, tr)

ftrainval = open('ImageSets/Main/trainval.txt', 'w')
ftest = open('ImageSets/Main/test.txt', 'w')
ftrain = open('ImageSets/Main/train.txt', 'w')
fval = open('ImageSets/Main/val.txt', 'w')

for i in list:
    name = total_xml[i][:-4] + '\n'
    if i in trainval:
        ftrainval.write(name)
        if i in train:
            ftest.write(name)
        else:
            fval.write(name)
    else:
        ftrain.write(name)

ftrainval.close()
ftrain.close()
fval.close()
ftest.close()

    第五步：生成yolo3所需的train.txt,val.txt,test.txt

    VOC2007数据集制作完成，但是，yolo3并不直接用这个数据集，开心么？

    需要的运行voc_annotation.py ，classes以三个颜色为例，你的数据集记得改

   

    运行之后，会在主目录下多生成三个txt文件，

    像这样：

手动删除2007_,

    第六步：修改参数文件yolo3.cfg

    注明一下，这个文件是用于转换官网下载的.weights文件用的。训练自己的网络并不需要去管他。详见readme

    IDE里直接打开cfg文件，ctrl+f搜 yolo, 总共会搜出3个含有yolo的地方，睁开你的卡姿兰大眼睛，3个yolo！！

    每个地方都要改3处，filters：3*（5+len（classes））；

                                    classes: len(classes) = 3，这里以红、黄、蓝三个颜色为例

                                    random：原来是1，显存小改为0

   

    第七步：修改model_data下的文件，放入你的类别，coco,voc这两个文件都需要修改。

    像这样：

  

    第八步：修改代码，准备训练。代码以yolo3模型为目标，tiny_yolo不考虑。

    为什么说这篇文章是从头开始训练？代码原作者在train.py做了两件事情：

    1、会加载预先对coco数据集已经训练完成的yolo3权重文件，

    像这样：

    2、冻结了开始到最后倒数第N层（源代码为N=-2），

   像这样：

   但是，你和我想训练的东西，coco里没有啊，所以，就干脆从头开始训练吧

    对train.py做了一下修改，直接复制替换原文件就可以了，细节大家自己看吧，直接运行，loss达到10几的时候效果就可以了

    train.py:

"""
Retrain the YOLO model for your own dataset.
"""
import numpy as np
import keras.backend as K
from keras.layers import Input, Lambda
from keras.models import Model
from keras.callbacks import TensorBoard, ModelCheckpoint, EarlyStopping

from yolo3.model import preprocess_true_boxes, yolo_body, tiny_yolo_body, yolo_loss
from yolo3.utils import get_random_data

def _main():
    annotation_path = 'train.txt'
    log_dir = 'logs/000/'
    classes_path = 'model_data/voc_classes.txt'
    anchors_path = 'model_data/yolo_anchors.txt'
    class_names = get_classes(classes_path)
    anchors = get_anchors(anchors_path)
    input_shape = (416,416) # multiple of 32, hw
    model = create_model(input_shape, anchors, len(class_names) )
    train(model, annotation_path, input_shape, anchors, len(class_names), log_dir=log_dir)

def train(model, annotation_path, input_shape, anchors, num_classes, log_dir='logs/'):
    model.compile(optimizer='adam', loss={
        'yolo_loss': lambda y_true, y_pred: y_pred})
    logging = TensorBoard(log_dir=log_dir)
    checkpoint = ModelCheckpoint(log_dir + "ep{epoch:03d}-loss{loss:.3f}-val_loss{val_loss:.3f}.h5",
        monitor='val_loss', save_weights_only=True, save_best_only=True, period=1)
    batch_size = 10
    val_split = 0.1
    with open(annotation_path) as f:
        lines = f.readlines()
    np.random.shuffle(lines)
    num_val = int(len(lines)*val_split)
    num_train = len(lines) - num_val
    print('Train on {} samples, val on {} samples, with batch size {}.'.format(num_train, num_val, batch_size))

    model.fit_generator(data_generator_wrap(lines[:num_train], batch_size, input_shape, anchors, num_classes),
            steps_per_epoch=max(1, num_train//batch_size),
            validation_data=data_generator_wrap(lines[num_train:], batch_size, input_shape, anchors, num_classes),
            validation_steps=max(1, num_val//batch_size),
            epochs=500,
            initial_epoch=0)
    model.save_weights(log_dir + 'trained_weights.h5')

def get_classes(classes_path):
    with open(classes_path) as f:
        class_names = f.readlines()
    class_names = [c.strip() for c in class_names]
    return class_names

def get_anchors(anchors_path):
    with open(anchors_path) as f:
        anchors = f.readline()
    anchors = [float(x) for x in anchors.split(',')]
    return np.array(anchors).reshape(-1, 2)

def create_model(input_shape, anchors, num_classes, load_pretrained=False, freeze_body=False,
            weights_path='model_data/yolo_weights.h5'):
    K.clear_session() # get a new session
    image_input = Input(shape=(None, None, 3))
    h, w = input_shape
    num_anchors = len(anchors)
    y_true = [Input(shape=(h//{0:32, 1:16, 2:8}[l], w//{0:32, 1:16, 2:8}[l], \
        num_anchors//3, num_classes+5)) for l in range(3)]

    model_body = yolo_body(image_input, num_anchors//3, num_classes)
    print('Create YOLOv3 model with {} anchors and {} classes.'.format(num_anchors, num_classes))

    if load_pretrained:
        model_body.load_weights(weights_path, by_name=True, skip_mismatch=True)
        print('Load weights {}.'.format(weights_path))
        if freeze_body:
            # Do not freeze 3 output layers.
            num = len(model_body.layers)-7
            for i in range(num): model_body.layers[i].trainable = False
            print('Freeze the first {} layers of total {} layers.'.format(num, len(model_body.layers)))

    model_loss = Lambda(yolo_loss, output_shape=(1,), name='yolo_loss',
        arguments={'anchors': anchors, 'num_classes': num_classes, 'ignore_thresh': 0.5})(
        [*model_body.output, *y_true])
    model = Model([model_body.input, *y_true], model_loss)
    return model
def data_generator(annotation_lines, batch_size, input_shape, anchors, num_classes):
    n = len(annotation_lines)
    np.random.shuffle(annotation_lines)
    i = 0
    while True:
        image_data = []
        box_data = []
        for b in range(batch_size):
            i %= n
            image, box = get_random_data(annotation_lines[i], input_shape, random=True)
            image_data.append(image)
            box_data.append(box)
            i += 1
        image_data = np.array(image_data)
        box_data = np.array(box_data)
        y_true = preprocess_true_boxes(box_data, input_shape, anchors, num_classes)
        yield [image_data, *y_true], np.zeros(batch_size)

def data_generator_wrap(annotation_lines, batch_size, input_shape, anchors, num_classes):
    n = len(annotation_lines)
    if n==0 or batch_size<=0: return None
    return data_generator(annotation_lines, batch_size, input_shape, anchors, num_classes)

if __name__ == '__main__':
    _main()    

第九步：预测图片。修改了yolo.py下的预测图片的函数，将检测的图片都储存在了outdir里

'''
def detect_img(yolo):
    while True:
        img = input('Input image filename:')
        try:
            image = Image.open(img)
        except:
            print('Open Error! Try again!')
            continue
        else:
            r_image = yolo.detect_image(image)
            r_image.show()
    yolo.close_session()
'''
import glob
def detect_img(yolo):
    path = "D:\VOCdevkit\VOC2007\JPEGImages\*.jpg"
    outdir = "D:\\VOCdevkit\VOC2007\SegmentationClass"
    for jpgfile in glob.glob(path):
        img = Image.open(jpgfile)
        img = yolo.detect_image(img)
        img.save(os.path.join(outdir, os.path.basename(jpgfile)))
    yolo.close_session()