dataset issue

[RiyazAina-DeepML]

i am getting division by zero error when i am running train.py code

File "./train.py", line 504, in
train()
File "./train.py", line 244, in train
num_epochs = math.ceil(cfg.max_iter / epoch_size)
ZeroDivisionError: division by zero

[disisisid]

Hi @RiyazAina-DeepML, were you able figure out the issue?

[SaimAli420]

i am getting division by zero error when i am running train.py code

File "./train.py", line 504, in
train()
File "./train.py", line 244, in train
num_epochs = math.ceil(cfg.max_iter / epoch_size)
ZeroDivisionError: division by zero

did u solve it?

[IgMart]

@disisisid @SaimAli420 @RiyazAina-DeepML were you able to solve it?

[tehkillerbee]

Correct me if I am wrong but I think this can happen if you have an epoch size greater than the number of training images.

[ma-minsu]

somebody help me...................

[leo010923]

as i am...

[protikmostafa083]

@dbolya can you please help? still couldn't solve this problem.

[TowardsAurora]

I also meet the problem. But when I change my dataset, the problem breake down.
you can use labelme to label your dataset and use the under code to reshape your dataset.

import os
import json
import numpy as np
import glob
import shutil
from sklearn.model_selection import train_test_split
np.random.seed(41)

#0为背景，此处根据你数据集的类别来修改key
classname_to_id = {"Portraits": 1}

class Lableme2CoCo:

    def __init__(self):
        self.images = []
        self.annotations = []
        self.categories = []
        self.img_id = 0
        self.ann_id = 0

    def save_coco_json(self, instance, save_path):
        json.dump(instance, open(save_path, 'w', encoding='utf-8'), ensure_ascii=False, indent=1)  # indent=2 更加美观显示

    # 由json文件构建COCO
    def to_coco(self, json_path_list):
        self._init_categories()
        for json_path in json_path_list:
            obj = self.read_jsonfile(json_path)
            self.images.append(self._image(obj, json_path))
            shapes = obj['shapes']
            for shape in shapes:
                annotation = self._annotation(shape)
                self.annotations.append(annotation)
                self.ann_id += 1
            self.img_id += 1
        instance = {}
        instance['info'] = 'spytensor created'
        instance['license'] = ['license']
        instance['images'] = self.images
        instance['annotations'] = self.annotations
        instance['categories'] = self.categories
        return instance

    # 构建类别
    def _init_categories(self):
        for k, v in classname_to_id.items():
            category = {}
            category['id'] = v
            category['name'] = k
            self.categories.append(category)

    # 构建COCO的image字段
    def _image(self, obj, path):
        image = {}
        from labelme import utils
        img_x = utils.img_b64_to_arr(obj['imageData'])
        h, w = img_x.shape[:-1]
        image['height'] = h
        image['width'] = w
        image['id'] = self.img_id
        image['file_name'] = os.path.basename(path).replace(".json", ".jpg")
        return image

    # 构建COCO的annotation字段
    def _annotation(self, shape):
        label = shape['label']
        points = shape['points']
        annotation = {}
        annotation['id'] = self.ann_id
        annotation['image_id'] = self.img_id
        annotation['category_id'] = int(classname_to_id[label])
        annotation['segmentation'] = [np.asarray(points).flatten().tolist()]
        annotation['bbox'] = self._get_box(points)
        annotation['iscrowd'] = 0
        annotation['area'] = 1.0
        return annotation

    # 读取json文件，返回一个json对象
    def read_jsonfile(self, path):
        with open(path, "r", encoding='utf-8') as f:
            return json.load(f)

    # COCO的格式： [x1,y1,w,h] 对应COCO的bbox格式
    def _get_box(self, points):
        min_x = min_y = np.inf
        max_x = max_y = 0
        for x, y in points:
            min_x = min(min_x, x)
            min_y = min(min_y, y)
            max_x = max(max_x, x)
            max_y = max(max_y, y)
        return [min_x, min_y, max_x - min_x, max_y - min_y]


if __name__ == '__main__':
    labelme_path = "labelme/"   # 此处根据你的数据集地址来修改
    saved_coco_path = "./"
    # 创建文件
    if not os.path.exists("%scoco/annotations/"%saved_coco_path):
        os.makedirs("%scoco/annotations/"%saved_coco_path)
    if not os.path.exists("%scoco/images/train2017/"%saved_coco_path):
        os.makedirs("%scoco/images/train2017"%saved_coco_path)
    if not os.path.exists("%scoco/images/val2017/"%saved_coco_path):
        os.makedirs("%scoco/images/val2017"%saved_coco_path)
    # 获取images目录下所有的joson文件列表
    json_list_path = glob.glob(labelme_path + "/*.json")
    # 数据划分,这里没有区分val2017和tran2017目录，所有图片都放在images目录下
    train_path, val_path = train_test_split(json_list_path, test_size=0.12)
    print("train_n:", len(train_path), 'val_n:', len(val_path))

    # 把训练集转化为COCO的json格式
    l2c_train = Lableme2CoCo()
    train_instance = l2c_train.to_coco(train_path)
    l2c_train.save_coco_json(train_instance, '%scoco/annotations/instances_train2017.json'%saved_coco_path)
    for file in train_path:
        shutil.copy(file.replace("json","jpg"),"%scoco/images/train2017/"%saved_coco_path)
    for file in val_path:
        shutil.copy(file.replace("json","jpg"),"%scoco/images/val2017/"%saved_coco_path)

    # 把验证集转化为COCO的json格式
    l2c_val = Lableme2CoCo()
    val_instance = l2c_val.to_coco(val_path)
    l2c_val.save_coco_json(val_instance, '%scoco/annotations/instances_val2017.json'%saved_coco_path)