Remove from the image folder any image that is not in the labels folder.

align_dataset.py

"""
Source: https://unix.stackexchange.com/questions/528490/python-removing-jpg-files-without-matching-txt-files
Remove from the image folder any image that is not in the labels folder. 
It is recommended to make a previous raw folder for security. In the opposite 
case (more labels than images) rename the necessary directories and variables.

.
├── images
│   ├── 1.jpg
│   ├── 2.jpg
│   ├── 3.jpg
│   ├── 4.jpg
│   └── 5.jpg
└── labels
    ├── 1.txt
    ├── 2.txt
    └── 5.txt

"""

from os import listdir, remove

labels = listdir('labels')  # *.txt
images = listdir('images')  # *.jpg

for image in images:
    if '{}.{}'.format(image.split('.')[0], 'txt') not in labels:
        print(f'Going to remove {image}')
        remove(f'images/{image}')