fix: lexicographic file sort misorders numbered frames

[andrewwhitecdw]

This PR addresses the following issue in scripts/convert_to_lerobot.py: lexicographic file sort misorders numbered frames.

Changes

• scripts/convert_to_lerobot.py: lexicographic file sort misorders numbered frames.

Details

Before:

# Get the paths of files within a directory.
def get_files_in_dir(path: Path) -> list[Path]:
    return sorted([p for p in path.iterdir() if p.is_file()])

After:

import re

# Get the paths of files within a directory.
def _natural_sort_key(path: Path):
    return [int(s) if s.isdigit() else s.lower() for s in re.split(r"(\d+)", path.name)]

def get_files_in_dir(path: Path) -> list[Path]:
    return sorted([p for p in path.iterdir() if p.is_file()], key=_natural_sort_key)