data_key = image_file.split('/')[-1].split('.')[0] label_key = label_file.split('/')[-1].split('.')[0]

These lines of code extract the name of the image file and the label file, respectively, from their file paths.

The `split()` method is used twice to remove the file path and the file extension from the file name.

`image_file.split('/')[-1]` splits the file path using the `/` separator and returns the last item in the resulting list, which is the file name.

`.split('.')[0]` then splits the file name using the `.` separator and returns the first item in the resulting list, which is the name of the file without the extension.

The same process is applied to the `label_file` variable to extract the label file name.

The resulting `data_key` and `label_key` variables can be used as unique identifiers for the image and its corresponding label in a dataset.