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摘要：将三通道图像转为一通道图像，并将类别的通道值统一为0, 1, 2，以解决MMSeg的报错与无法训练问题

描述

• 跑自定义数据集时报错，理论上其它东西都没错，那就只能是图片问题。
• 但我这次弄了两个数据集，上一个虽然也报这个错，不过用某些方式解决了，可行的数据集的 GT 是彩色图片，报错是黑白图片，检查发现黑白图片也是三通道，那就不该是通道问题。
• 但查官方 issue 后，发现他们推荐单通道：https://github.com/open-mmlab/mmsegmentation/issues/1625#issuecomment-1140384065
• 在更改为单通道后，以下报错消失，但出现了新的问题，指标/损失异常

ValueError: Input and output must have the same number of spatial dimensions, but got input with with spatial dimensions of [128, 128] and output size of torch.Size([512, 512, 3]). Please provide input tensor in (N, C, d1, d2, ...,dK) format and output size in (o1, o2, ...,oK) format.

• 多次测试，将单分类分为两类，背景类与目标类，分别对应像素值 0, 1 （值域 0-255），而后解决。
• 但出现目标类难训练，改变损失权重后解决。
  • ref: https://blog.patrickcty.cc/2021/05/21/mmsegmentation%E4%BA%8C%E5%88%86%E7%B1%BB%E9%85%8D%E7%BD%AE/
• 顺带一提，MMSeg 说更新了类别为 1 时的处理，但我更新到最新版后依然和老版一样。
  • 见：https://github.com/open-mmlab/mmsegmentation/pull/2016

代码

• 排序代码有点难写，不想动脑子，因此只有一个量体裁衣的代码。
• 给定图片背景值为 (0, 0, 0)，目标值为 (255, 255, 255)，代码将其改为 (0) 与 (1)
• 以下两个代码放在同级文件夹下，运行 chennel3to1.py，输入待处理文件夹（支持递归），输出结果见 log 文件夹。
  • 我其实写了好多类似的小工具，但是就传了最初版到 GitHub 上，太懒了…

# channel3to1.py
from base_model import BaseModel
import cv2
import numpy as npclass Channels3to1(BaseModel):def __init__(self):super().__init__()self.change_log_path()passdef run(self):path = input("Input path: ")files_path = self.get_path_content(path, 'allfile')self.log(f"Path: {path}")for i, file_path in enumerate(files_path):self.log(f"{i+1}: {file_path}")for i, file_path in enumerate(files_path):img = cv2.imread(file_path)H, W, C = img.shapeimg = img[:, :, 0].tolist()for h in range(H):for w in range(W):if img[h][w] != 0:img[h][w] = [1]else:img[h][w] = [0]img = np.array(img)save_path = self.log_dir + "/"+ self.path2name(file_path, keep_ext=True)cv2.imwrite(save_path, img, [int(cv2.IMWRITE_PNG_COMPRESSION), 0])self.log(f"{i+1}: {file_path} converted (H, W, 3) -> (H, W, 1) to {save_path}")if __name__ == "__main__":Channels3to1().run()

# base_model.py
import os
import os.path as osp
import re
import json
import time
import datetimeclass BaseModel():"""BaseModel, call it "utils" is OK."""def __init__(self, log_dir='', lang='en'):if log_dir == '':self.log_root = f"./log/{self.__class__.__name__}"else:self.log_root = log_dirself.log_dir = self.log_rootself.timestamp = time.time()self.log_file = f"{self.__class__.__name__}_{self.timestamp}.log"# self.lang_path = "./languages"# self.lang_dict = {#     "en": "English.json",#     "zh": "Chinese.json"# }# self.lang_encoding = {#     "en": "utf-8",#     "zh": "gb18030"# }# self.lang = {}# self.parse_from_language("zh")def help(self): """ Help functionPrint the help message"""self.log(self.__doc__)def change_log_path(self, mode="timestamp"):if mode == "timestamp":self.log_dir = osp.join(self.log_root, str(self.timestamp))elif mode == "root":self.log_dir = self.log_rootdef init_log_file(self):self.log_file = f"{self.__class__.__name__}_{time.time()}.log"def get_path_content(self, path, mode='allfile'):"""mode:allfile: All files in path, including files in subfolders.file: Files in path, only including files in this dir: pathdir: Dirs in path, only including Dir in this dir: path"""path_content = []index = 0for root, dirs, files in os.walk(path):index += 1if mode == 'allfile':for file in files:file_path = osp.join(root, file)path_content.append(file_path)if mode == 'file':for file in files:file_path = osp.join(root, file)path_content.append(file_path)breakif mode == 'dir':for dir in dirs:dir_path = osp.join(root, dir)path_content.append(dir_path)breakreturn path_contentdef is_file_meet(self, file_path, condition={'size_max': '10M', 'size_min': '10M', 'ext_allow': ['pth', 'pt', 't'],'ext_forbid': ['pth', 'pt', 't'],'name_allow': ['epoch_99.t'],'name_forbid': ['epoch_99.t']}):meet = Truefor k, v in condition.items():if k == 'size_max':# file size should <= size_maxmax_value = self.unit_conversion(v, 'B')file_size = os.path.getsize(file_path)if not file_size <= max_value:meet = Falseelif k == 'size_min':# file size should >= size_minmin_value = self.unit_conversion(v, 'B')file_size = os.path.getsize(file_path)if not file_size >= min_value:meet = Falseelif k == 'ext_allow':# file's extension name should in ext_allow[]_, file_name = os.path.split(file_path)_, ext = os.path.splitext(file_name)ext = ext[1:]if not ext in v:meet = Falseelif k == 'ext_forbid':# file's extension name shouldn't in ext_forbid[]_, file_name = os.path.split(file_path)_, ext = os.path.splitext(file_name)ext = ext[1:]if ext in v:meet = Falseelif k == 'name_allow':# file's name should in name_allow[]_, file_name = os.path.split(file_path)if not file_name in v:meet = Falseelif k == 'name_forbid':# file's name shouldn't in name_forbid[]_, file_name = os.path.split(file_path)if file_name in v:meet = Falsereturn meetdef unit_conversion(self, size, output_unit='B'):# convert [GB, MB, KB, B] to [GB, MB, KB, B]if not isinstance(size, str):return size# to Bytesize = size.upper()if 'GB' == size[-2:] or 'G' == size[-1]:size = size.replace("G", '')size = size.replace("B", '')size_num = float(size)size_num = size_num * 1024 * 1024 * 1024elif 'MB' == size[-2:] or 'M' == size[-1]:size = size.replace("M", '')size = size.replace("B", '')size_num = float(size)size_num = size_num * 1024 * 1024elif 'KB' == size[-2:] or 'K' == size[-1]:size = size.replace("K", '')size = size.replace("B", '')size_num = float(size)size_num = size_num * 1024elif 'B' == size[-1]:size = size.replace("B", '')size_num = float(size)else:raise# to output_unitif output_unit in ['GB', 'G']:size_num = size_num / 1024 / 1024 / 1024if output_unit in ['MB', 'M']:size_num = size_num / 1024 / 1024if output_unit in ['KB', 'K']:size_num = size_num / 1024if output_unit in ['B']:size_num = size_num# returnreturn size_numdef mkdir(self, path):if not osp.exists(path):os.makedirs(path)def split_content(self, content):if isinstance(content[0], str):content_split = []for path in content:content_split.append(osp.split(path))return content_splitelif isinstance(content[0], list):contents_split = []for group in content:content_split = []for path in group:content_split.append(osp.split(path))contents_split.append(content_split)return contents_splitdef path_to_last_dir(self, path):dirname = osp.dirname(path)last_dir = osp.basename(dirname)return last_dirdef path2name(self, path, keep_ext=False):_, filename = osp.split(path)if keep_ext:return filenamefile, _ = osp.splitext(filename)return filedef sort_list(self, list):# copy from: https://www.modb.pro/db/162223# To make 1, 10, 2, 20, 3, 4, 5 -> 1, 2, 3, 4, 5, 10, 20list = sorted(list, key=lambda s: [int(s) if s.isdigit() else s for s in sum(re.findall(r'(\D+)(\d+)', 'a'+s+'0'), ())])return listdef file_last_subtract_1(self, path, mode='-'):"""Just for myself.file:xxx.png 1ccc.png 2---> mode='-' --->file:xxx.png 0ccc.png 1"""with open(path, 'r') as f:lines = f.readlines()res = []for line in lines:last = -2 if line[-1] == '\n' else -1line1, line2 = line[:last], line[last]if mode == '-':line2 = str(int(line2) - 1)elif mode == '+':line2 = str(int(line2) + 1)line = line1 + line2 + "\n"if last == -1:line = line1 + line2res.append(line)with open(path, 'w') as f:f.write("".join(res))def log(self, content):time_now = datetime.datetime.now()content = f"{time_now}: {content}\n"self.log2file(content, self.log_file, mode='a')print(content, end='')def append2file(self, path, text):with open(path, 'a') as f:f.write(text)def log2file(self, content, log_path='log.txt', mode='w', show=False):self.mkdir(self.log_dir)path = osp.join(self.log_dir, log_path)with open(path, mode, encoding='utf8') as f:if isinstance(content, list):f.write("".join(content))elif isinstance(content, str):f.write(content)elif isinstance(content, dict):json.dump(content, f, indent=2, sort_keys=True, ensure_ascii=False)else:f.write(str(content))if show:self.log(f"Log save to: {path}")def list2tuple2str(self, list):return str(tuple(list))def dict_plus(self, dict, key, value=1):if key in dict.keys():dict[key] += valueelse:dict[key] = valuedef sort_by_label(self, path_label_list):"""list:["mwhls.jpg 1",                      # path and label"mwhls.png 0",                      # path and label"mwhls.gif 0"]                      # path and label-->list:[["0", "1"],                         # label["mwhls.png 0", "mwhls.gif 0"],     # class 0["mwhls.jpg 1"]]                    # class 1"""label_list = []for path_label in path_label_list:label = path_label.split()[-1]label_list.append(label)label_set = set(label_list)res_list = []res_list.append(list(label_set))for label in label_set:index_equal = []    # why index_equal = label_list == label isn't working?for i, lab in enumerate(label_list):if lab == label:index_equal.append(i)res = [path_label_list[i] for i in index_equal] # why path_label_list[index_equal] isn't working either??res_list.append(res)return res_listdef clear_taobao_link(self, text):# try:link = "https://item.taobao.com/item.htm?"try:id_index_1 = text.index('&id=') + 1id_index = id_index_1except:passtry:id_index_2 = text.index('?id=') + 1id_index = id_index_2except:passtry:id = text[id_index: id_index+15]text = link + idexcept:passreturn text# except:#     return textdef parse_from_language(self, lang='en'):path = osp.join(self.lang_path, self.lang_dict[lang])with open(path, "rb") as f:self.lang = json.load(f)if __name__ == '__main__':# .py to .exe# os.system("pyinstaller -F main.py")# print(get_path_content("test2"))# file_last_subtract_1("path_label.txt")pass