SSD
- 训练
* - data/init.py
- data/config.py
- data/voc0712.py
- layers/modules/multibox_loss.py
- ssd.py
- train.py
- 预训练文件vgg16_reducedfc.pth
- eval.py
- demo.py
- demo/live.py
- 遇到的问题
* - train.py
–- TypeError: unsupported operand type(s) for /=: ‘Tensor’ and ‘builtin_function_or_method’…
- 找不到数据集里的文件夹/文件
- FileNotFoundError: [Errno 2] No such file or directory: ‘C:\Users\Administrator\data/coco/coco_labels.txt’
- RuntimeError: Legacy autograd function with non-static forward method is deprecated. Please use new-style autograd function with static forward method.
- AttributeError: ‘NoneType’ object has no attribute ‘shape’
- IndexError: Too many indices for array:Array is 1-dimensional,but 2 were indexed （20220105更新）
- eval.py
–
训练
去GitHub上下载SSD源码
新建一个VOCdevkit文件夹，放入VOC2007数据集
import os
import random
trainval_percent = 0.9
train_percent = 0.8
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(txtsavepath + '/trainval.txt', 'w')
ftest = open(txtsavepath + '/test.txt', 'w')
ftrain = open(txtsavepath + '/train.txt', 'w')
fval = open(txtsavepath + '/val.txt', 'w')
for i in list:
name = total_xml[i][:-4] + '\n'
if i in trainval:
ftrainval.write(name)
if i in train:
ftrain.write(name)
else:
fval.write(name)
else:
ftest.write(name)
ftrainval.close()
ftrain.close()
fval.close()
ftest.close()
data/ init .py
注释 第3行 from .coco import COCODetection, COCOAnnotationTransform, COCO_CLASSES, COCO_ROOT, get_label_map
data/config.py
第15行的 num_classes改成 自己设定的类别数+1；
设置 max_iter最大迭代数
data/voc0712.py
第20行的 VOC_CLASSES =改成自己的类别名；
第93行改为 image_sets=[('2007', 'trainval')]
layers/modules/multibox_loss.py
第97行的 loss_c[pos] = 0前面加上一句 loss_c = loss_c.view(num, -1)
ssd.py
把所有的 num_classes的数量(第32、198行)都改为 类别数+1
train.py
parser batch_size， learning-rate根据自己电脑情况修改(batchsize=16)；
basenet 预训练模型， start_iter迭代起始点， save_folder模型保存地址
搜索这里面的 data[0]，全部替换为 item()；
第84、85行注释掉；
第198行 iteration % 5000 == 0，意味着每5000次保存一次模型，可改为200。后两行可改保存的模型名。
可以在第195行创建txt记录loss值：
with open('loss.txt', 'a') as f:
f.write(str(loss.item()) + '\n')
165行的 images, targets = next(batch_iterator)改成：
try:
images, targets = next(batch_iterator)
except StopIteration:
batch_iterator = iter(data_loader)
images, targets = next(batch_iterator)
预训练文件vgg16_reducedfc.pth
开始训练时需要一个预训练文件 vgg16_reducedfc.pth
下载之后放在SSD项目下新建的weights文件夹下，然后就可以进行训练了。
注：训练中途遇到 loss=nan 的现象，将 train.py中， parser.add_argument('--lr', '--learning-rate', default=1e-3, type=float,中的 default=1e-3改为 default=1e-4。*直到loss降低到1左右时即可 *
eval.py
trained_model评估的模型路径， save_folder 评估保存路径
demo.py
新建 test_image，在文件夹中放置几张待测图片（四处修改 20220106更新）
import os
import sys
import torch
from torch.autograd import Variable
import numpy as np
import cv2
from ssd import build_ssd
from data import VOC_CLASSES as labels
from matplotlib import pyplot as plt
os.environ["KMP_DUPLICATE_LIB_OK"] = "TRUE"
module_path = os.path.abspath(os.path.join('..'))
if module_path not in sys.path:
sys.path.append(module_path)
if torch.cuda.is_available():
torch.set_default_tensor_type('torch.cuda.FloatTensor')
net = build_ssd('test', 300, 5)
net.load_weights('weights/ssd300_VOC_1995.pth')
imgs = 'test_image/'
img_list = os.listdir(imgs)
for img in img_list:
current_img = imgs + img
image = cv2.imread(current_img)
rgb_image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
x = cv2.resize(image, (300, 300)).astype(np.float32)
x -= (104.0, 117.0, 123.0)
x = x.astype(np.float32)
x = x[:, :, ::-1].copy()
x = torch.from_numpy(x).permute(2, 0, 1)
xx = Variable(x.unsqueeze(0))
if torch.cuda.is_available():
xx = xx.cuda()
y = net(xx)
top_k = 10
plt.figure(figsize=(6, 6))
colors = plt.cm.hsv(np.linspace(0, 1, 21)).tolist()
currentAxis = plt.gca()
detections = y.data
scale = torch.Tensor(rgb_image.shape[1::-1]).repeat(2)
for i in range(detections.size(1)):
j = 0
while detections[0, i, j, 0] >= 0.6:
score = detections[0, i, j, 0]
label_name = labels[i-1]
display_txt = '%s: %.2f'%(label_name, score)
print(display_txt)
pt = (detections[0,i,j,1:]*scale).cpu().numpy()
coords = (pt[0], pt[1]), pt[2]-pt[0]+1, pt[3]-pt[1]+1
color = colors[i]
currentAxis.add_patch(plt.Rectangle(*coords, fill=False, edgecolor=color, linewidth=2))
currentAxis.text(pt[0], pt[1], display_txt, bbox={'facecolor':color, 'alpha':0.5})
j += 1
plt.imshow(rgb_image)
plt.show()
demo/live.py
摄像头识别 (没试)
第10行用…/找到上一级目录
parser.add_argument('--weights', default='../weights/xxxxxx.pth',
第78行 类别+1
遇到的问题
报错顺序不记得了，下面是遇到的大部分错误
train.py
TypeError: unsupported operand type(s) for /=: ‘Tensor’ and ‘builtin_function_or_method’…
loss_l /= N这句错误
因为一些教程里还改了 layers/modules/multibox_loss.py程序：
第115行 N = num_pos.data.sum()改为
N = num_pos.data.sum().double
loss_l = loss_l.double()
loss_c = loss_c.double()
会出现这个问题.
找不到数据集里的文件夹/文件
VOC数据集名字错了 注意名称 和 大小写
FileNotFoundError: [Errno 2] No such file or directory: ‘C:\Users\Administrator\data/coco/coco_labels.txt’
train.py 第二行如果有 from data.coco import COCO_ROOT, COCODetection注释掉
RuntimeError: Legacy autograd function with non-static forward method is deprecated. Please use new-style autograd function with static forward method.
版本问题。 参考
改 detection.py为（更新 注释部分已翻译）
"""
Copyright (c) 2017 Max deGroot, Ellis Brown
Released under the MIT license
https://github.com/amdegroot/ssd.pytorch
Updated by: Takuya Mouri
"""
import torch
from torch.autograd import Function
from ..box_utils import decode, nms
from data import voc as cfg
class Detect(Function):
"""At test time, Detect is the final layer of SSD. Decode location preds,
apply non-maximum suppression to location predictions based on conf
scores and threshold to a top_k number of output predictions for both
confidence score and locations.
"""
@staticmethod
def forward(self, num_classes, bkg_label, top_k, conf_thresh, nms_thresh, loc_data, conf_data, prior_data):
self.num_classes = num_classes
self.background_label = bkg_label
self.top_k = top_k
self.nms_thresh = nms_thresh
if nms_thresh 0:
raise ValueError('nms_threshold must be non negative.')
self.conf_thresh = conf_thresh
self.variance = cfg['variance']
"""
Args:
loc_data: (tensor) Loc preds from loc layers
Shape: [batch,num_priors*4]
conf_data: (tensor) Shape: Conf preds from conf layers
Shape: [batch*num_priors,num_classes]
prior_data: (tensor) Prior boxes and variances from priorbox layers
Shape: [1,num_priors,4]
"""
num = loc_data.size(0)
num_priors = prior_data.size(0)
output = torch.zeros(num, self.num_classes, self.top_k, 5)
conf_preds = conf_data.view(num, num_priors,
self.num_classes).transpose(2, 1)
for i in range(num):
decoded_boxes = decode(loc_data[i], prior_data, self.variance)
conf_scores = conf_preds[i].clone()
for cl in range(1, self.num_classes):
c_mask = conf_scores[cl].gt(self.conf_thresh)
scores = conf_scores[cl][c_mask]
if scores.size(0) == 0:
continue
l_mask = c_mask.unsqueeze(1).expand_as(decoded_boxes)
boxes = decoded_boxes[l_mask].view(-1, 4)
ids, count = nms(boxes, scores, self.nms_thresh, self.top_k)
output[i, cl, :count] = \
torch.cat((scores[ids[:count]].unsqueeze(1),
boxes[ids[:count]]), 1)
flt = output.contiguous().view(num, -1, 5)
_, idx = flt[:, :, 0].sort(1, descending=True)
_, rank = idx.sort(1)
flt[(rank < self.top_k).unsqueeze(-1).expand_as(flt)].fill_(0)
return output
ssd.py中99行左右
output = self.detect(
改为
output = self.detect.apply(self.num_classes, 0, 200, 0.01, 0.45,
AttributeError: ‘NoneType’ object has no attribute ‘shape’
change coco.py:
from: img=cv2.imread(osp.join(self.root,path))
to: img=cv2.imread(path)
IndexError: Too many indices for array:Array is 1-dimensional,but 2 were indexed （20220105更新）
annotation也就是xml文件里面有些包含空目标（我的没有也报错了）
参考 网址
出错的xml和jpg修改 或 删掉 （流程结束后需要重新生成VOC的四个txt文件）
新建 check.py
修改 root 、 classes
import argparse
import sys
import cv2
import os
import os.path as osp
import numpy as np
if sys.version_info[0] == 2:
import xml.etree.cElementTree as ET
else:
import xml.etree.ElementTree as ET
parser = argparse.ArgumentParser(
description='Single Shot MultiBox Detector Training With Pytorch')
train_set = parser.add_mutually_exclusive_group()
parser.add_argument('--root', default="xxxxxxxxxxxxxxxxxxxxxxxxxxx", help='Dataset root directory path')
args = parser.parse_args()
CLASSES = (
'fire', 'xxxxxxxxxxxxxxxxxxxxx')
annopath = osp.join('%s', 'Annotations', '%s.{}'.format("xml"))
imgpath = osp.join('%s', 'JPEGImages', '%s.{}'.format("jpg"))
def vocChecker(image_id, width, height, keep_difficult = False):
target = ET.parse(annopath % image_id).getroot()
res = []
for obj in target.iter('object'):
difficult = int(obj.find('difficult').text) == 1
if not keep_difficult and difficult:
continue
name = obj.find('name').text.lower().strip()
bbox = obj.find('bndbox')
pts = ['xmin', 'ymin', 'xmax', 'ymax']
bndbox = []
for i, pt in enumerate(pts):
cur_pt = int(bbox.find(pt).text) - 1
cur_pt = float(cur_pt) / width if i % 2 == 0 else float(cur_pt) / height
bndbox.append(cur_pt)
print(name)
label_idx = dict(zip(CLASSES, range(len(CLASSES))))[name]
bndbox.append(label_idx)
res += [bndbox]
print(res)
try :
print(np.array(res)[:,4])
print(np.array(res)[:,:4])
except IndexError:
print("\nINDEX ERROR HERE !\n")
exit(0)
return res
if __name__ == '__main__' :
i = 0
for name in sorted(os.listdir(osp.join(args.root,'Annotations'))):
i += 1
img = cv2.imread(imgpath % (args.root,name.split('.')[0]))
height, width, channels = img.shape
print("path : {}".format(annopath % (args.root,name.split('.')[0])))
res = vocChecker((args.root, name.split('.')[0]), height, width)
print("Total of annotations : {}".format(i))
eval.py
右键运行变成test模式
打开pycharm进入了test模式，具体表现为用”Run ‘py.test xxx.py'”
左上角File-settings-python integrated tools里面修改，选择unittest修改后记得apply
开始运行后到某一个图片突然出错
改VOC2007的main里边的 test.txt 删掉错误的那一行
eval运行到最后 FileNotFoundError: [Errno 2] No such file or directory: ‘test.txt’
这只是一个符号问题；os.path.join 不接受在原始实现中加入带有括号”{😒}.txt”的路径。它会忽略所有路径 ~/VOC2007/ImageSets/Main/test.txt 并简单地假设路径是： currentpath/test.txt
修复指定 imgsetpath 的行，如下所示：
imgsetpath = os.path.join(args.voc_root, 'VOC2007', 'ImageSets', 'Main', '%s.txt')
在函数 do_python_eval 中将
filename, annopath, imgsetpath.format(set_type), cls, cachedir,
改为
filename, annopath, imgsetpath % set_type, cls, cachedir,
我不管 未来 会怎么样 但我每天都想见到你
Original: https://blog.csdn.net/zrg_hzr_1/article/details/121661026
Author: 国服最强貂蝉
Title: SSD-Pytorch训练自己的VOC数据集&遇到的问题及解决办法
原创文章受到原创版权保护。转载请注明出处：https://www.johngo689.com/680770/
转载文章受原作者版权保护。转载请注明原作者出处！