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Reference for ultralytics/utils/checks.py

Note

This file is available at https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/checks.py. If you spot a problem please help fix it by contributing a Pull Request 🛠️. Thank you 🙏!


ultralytics.utils.checks.parse_requirements

parse_requirements(file_path=ROOT.parent / 'requirements.txt', package='')

Parse a requirements.txt file, ignoring lines that start with '#' and any text after '#'.

Parameters:

Name Type Description Default
file_path Path

Path to the requirements.txt file.

parent / 'requirements.txt'
package str

Python package to use instead of requirements.txt file, i.e. package='ultralytics'.

''

Returns:

Type Description
List[Dict[str, str]]

List of parsed requirements as dictionaries with name and specifier keys.

Example
from ultralytics.utils.checks import parse_requirements

parse_requirements(package="ultralytics")
Source code in ultralytics/utils/checks.py
def parse_requirements(file_path=ROOT.parent / "requirements.txt", package=""):
    """
    Parse a requirements.txt file, ignoring lines that start with '#' and any text after '#'.

    Args:
        file_path (Path): Path to the requirements.txt file.
        package (str, optional): Python package to use instead of requirements.txt file, i.e. package='ultralytics'.

    Returns:
        (List[Dict[str, str]]): List of parsed requirements as dictionaries with `name` and `specifier` keys.

    Example:
        ```python
        from ultralytics.utils.checks import parse_requirements

        parse_requirements(package="ultralytics")
        ```
    """
    if package:
        requires = [x for x in metadata.distribution(package).requires if "extra == " not in x]
    else:
        requires = Path(file_path).read_text().splitlines()

    requirements = []
    for line in requires:
        line = line.strip()
        if line and not line.startswith("#"):
            line = line.split("#")[0].strip()  # ignore inline comments
            match = re.match(r"([a-zA-Z0-9-_]+)\s*([<>!=~]+.*)?", line)
            if match:
                requirements.append(SimpleNamespace(name=match[1], specifier=match[2].strip() if match[2] else ""))

    return requirements





ultralytics.utils.checks.parse_version

parse_version(version='0.0.0') -> tuple

Convert a version string to a tuple of integers, ignoring any extra non-numeric string attached to the version. This function replaces deprecated 'pkg_resources.parse_version(v)'.

Parameters:

Name Type Description Default
version str

Version string, i.e. '2.0.1+cpu'

'0.0.0'

Returns:

Type Description
tuple

Tuple of integers representing the numeric part of the version and the extra string, i.e. (2, 0, 1)

Source code in ultralytics/utils/checks.py
def parse_version(version="0.0.0") -> tuple:
    """
    Convert a version string to a tuple of integers, ignoring any extra non-numeric string attached to the version. This
    function replaces deprecated 'pkg_resources.parse_version(v)'.

    Args:
        version (str): Version string, i.e. '2.0.1+cpu'

    Returns:
        (tuple): Tuple of integers representing the numeric part of the version and the extra string, i.e. (2, 0, 1)
    """
    try:
        return tuple(map(int, re.findall(r"\d+", version)[:3]))  # '2.0.1+cpu' -> (2, 0, 1)
    except Exception as e:
        LOGGER.warning(f"WARNING ⚠️ failure for parse_version({version}), returning (0, 0, 0): {e}")
        return 0, 0, 0





ultralytics.utils.checks.is_ascii

is_ascii(s) -> bool

Check if a string is composed of only ASCII characters.

Parameters:

Name Type Description Default
s str

String to be checked.

required

Returns:

Type Description
bool

True if the string is composed only of ASCII characters, False otherwise.

Source code in ultralytics/utils/checks.py
def is_ascii(s) -> bool:
    """
    Check if a string is composed of only ASCII characters.

    Args:
        s (str): String to be checked.

    Returns:
        (bool): True if the string is composed only of ASCII characters, False otherwise.
    """
    # Convert list, tuple, None, etc. to string
    s = str(s)

    # Check if the string is composed of only ASCII characters
    return all(ord(c) < 128 for c in s)





ultralytics.utils.checks.check_imgsz

check_imgsz(imgsz, stride=32, min_dim=1, max_dim=2, floor=0)

Verify image size is a multiple of the given stride in each dimension. If the image size is not a multiple of the stride, update it to the nearest multiple of the stride that is greater than or equal to the given floor value.

Parameters:

Name Type Description Default
imgsz int | cList[int]

Image size.

required
stride int

Stride value.

32
min_dim int

Minimum number of dimensions.

1
max_dim int

Maximum number of dimensions.

2
floor int

Minimum allowed value for image size.

0

Returns:

Type Description
List[int]

Updated image size.

Source code in ultralytics/utils/checks.py
def check_imgsz(imgsz, stride=32, min_dim=1, max_dim=2, floor=0):
    """
    Verify image size is a multiple of the given stride in each dimension. If the image size is not a multiple of the
    stride, update it to the nearest multiple of the stride that is greater than or equal to the given floor value.

    Args:
        imgsz (int | cList[int]): Image size.
        stride (int): Stride value.
        min_dim (int): Minimum number of dimensions.
        max_dim (int): Maximum number of dimensions.
        floor (int): Minimum allowed value for image size.

    Returns:
        (List[int]): Updated image size.
    """
    # Convert stride to integer if it is a tensor
    stride = int(stride.max() if isinstance(stride, torch.Tensor) else stride)

    # Convert image size to list if it is an integer
    if isinstance(imgsz, int):
        imgsz = [imgsz]
    elif isinstance(imgsz, (list, tuple)):
        imgsz = list(imgsz)
    elif isinstance(imgsz, str):  # i.e. '640' or '[640,640]'
        imgsz = [int(imgsz)] if imgsz.isnumeric() else eval(imgsz)
    else:
        raise TypeError(
            f"'imgsz={imgsz}' is of invalid type {type(imgsz).__name__}. "
            f"Valid imgsz types are int i.e. 'imgsz=640' or list i.e. 'imgsz=[640,640]'"
        )

    # Apply max_dim
    if len(imgsz) > max_dim:
        msg = (
            "'train' and 'val' imgsz must be an integer, while 'predict' and 'export' imgsz may be a [h, w] list "
            "or an integer, i.e. 'yolo export imgsz=640,480' or 'yolo export imgsz=640'"
        )
        if max_dim != 1:
            raise ValueError(f"imgsz={imgsz} is not a valid image size. {msg}")
        LOGGER.warning(f"WARNING ⚠️ updating to 'imgsz={max(imgsz)}'. {msg}")
        imgsz = [max(imgsz)]
    # Make image size a multiple of the stride
    sz = [max(math.ceil(x / stride) * stride, floor) for x in imgsz]

    # Print warning message if image size was updated
    if sz != imgsz:
        LOGGER.warning(f"WARNING ⚠️ imgsz={imgsz} must be multiple of max stride {stride}, updating to {sz}")

    # Add missing dimensions if necessary
    sz = [sz[0], sz[0]] if min_dim == 2 and len(sz) == 1 else sz[0] if min_dim == 1 and len(sz) == 1 else sz

    return sz





ultralytics.utils.checks.check_version

check_version(
    current: str = "0.0.0",
    required: str = "0.0.0",
    name: str = "version",
    hard: bool = False,
    verbose: bool = False,
    msg: str = "",
) -> bool

Check current version against the required version or range.

Parameters:

Name Type Description Default
current str

Current version or package name to get version from.

'0.0.0'
required str

Required version or range (in pip-style format).

'0.0.0'
name str

Name to be used in warning message.

'version'
hard bool

If True, raise an AssertionError if the requirement is not met.

False
verbose bool

If True, print warning message if requirement is not met.

False
msg str

Extra message to display if verbose.

''

Returns:

Type Description
bool

True if requirement is met, False otherwise.

Example
# Check if current version is exactly 22.04
check_version(current="22.04", required="==22.04")

# Check if current version is greater than or equal to 22.04
check_version(current="22.10", required="22.04")  # assumes '>=' inequality if none passed

# Check if current version is less than or equal to 22.04
check_version(current="22.04", required="<=22.04")

# Check if current version is between 20.04 (inclusive) and 22.04 (exclusive)
check_version(current="21.10", required=">20.04,<22.04")
Source code in ultralytics/utils/checks.py
def check_version(
    current: str = "0.0.0",
    required: str = "0.0.0",
    name: str = "version",
    hard: bool = False,
    verbose: bool = False,
    msg: str = "",
) -> bool:
    """
    Check current version against the required version or range.

    Args:
        current (str): Current version or package name to get version from.
        required (str): Required version or range (in pip-style format).
        name (str, optional): Name to be used in warning message.
        hard (bool, optional): If True, raise an AssertionError if the requirement is not met.
        verbose (bool, optional): If True, print warning message if requirement is not met.
        msg (str, optional): Extra message to display if verbose.

    Returns:
        (bool): True if requirement is met, False otherwise.

    Example:
        ```python
        # Check if current version is exactly 22.04
        check_version(current="22.04", required="==22.04")

        # Check if current version is greater than or equal to 22.04
        check_version(current="22.10", required="22.04")  # assumes '>=' inequality if none passed

        # Check if current version is less than or equal to 22.04
        check_version(current="22.04", required="<=22.04")

        # Check if current version is between 20.04 (inclusive) and 22.04 (exclusive)
        check_version(current="21.10", required=">20.04,<22.04")
        ```
    """
    if not current:  # if current is '' or None
        LOGGER.warning(f"WARNING ⚠️ invalid check_version({current}, {required}) requested, please check values.")
        return True
    elif not current[0].isdigit():  # current is package name rather than version string, i.e. current='ultralytics'
        try:
            name = current  # assigned package name to 'name' arg
            current = metadata.version(current)  # get version string from package name
        except metadata.PackageNotFoundError as e:
            if hard:
                raise ModuleNotFoundError(emojis(f"WARNING ⚠️ {current} package is required but not installed")) from e
            else:
                return False

    if not required:  # if required is '' or None
        return True

    if "sys_platform" in required and (  # i.e. required='<2.4.0,>=1.8.0; sys_platform == "win32"'
        (WINDOWS and "win32" not in required)
        or (LINUX and "linux" not in required)
        or (MACOS and "macos" not in required and "darwin" not in required)
    ):
        return True

    op = ""
    version = ""
    result = True
    c = parse_version(current)  # '1.2.3' -> (1, 2, 3)
    for r in required.strip(",").split(","):
        op, version = re.match(r"([^0-9]*)([\d.]+)", r).groups()  # split '>=22.04' -> ('>=', '22.04')
        if not op:
            op = ">="  # assume >= if no op passed
        v = parse_version(version)  # '1.2.3' -> (1, 2, 3)
        if op == "==" and c != v:
            result = False
        elif op == "!=" and c == v:
            result = False
        elif op == ">=" and not (c >= v):
            result = False
        elif op == "<=" and not (c <= v):
            result = False
        elif op == ">" and not (c > v):
            result = False
        elif op == "<" and not (c < v):
            result = False
    if not result:
        warning = f"WARNING ⚠️ {name}{op}{version} is required, but {name}=={current} is currently installed {msg}"
        if hard:
            raise ModuleNotFoundError(emojis(warning))  # assert version requirements met
        if verbose:
            LOGGER.warning(warning)
    return result





ultralytics.utils.checks.check_latest_pypi_version

check_latest_pypi_version(package_name='ultralytics')

Returns the latest version of a PyPI package without downloading or installing it.

Parameters:

Name Type Description Default
package_name str

The name of the package to find the latest version for.

'ultralytics'

Returns:

Type Description
str

The latest version of the package.

Source code in ultralytics/utils/checks.py
def check_latest_pypi_version(package_name="ultralytics"):
    """
    Returns the latest version of a PyPI package without downloading or installing it.

    Args:
        package_name (str): The name of the package to find the latest version for.

    Returns:
        (str): The latest version of the package.
    """
    try:
        requests.packages.urllib3.disable_warnings()  # Disable the InsecureRequestWarning
        response = requests.get(f"https://pypi.org/pypi/{package_name}/json", timeout=3)
        if response.status_code == 200:
            return response.json()["info"]["version"]
    except Exception:
        return None





ultralytics.utils.checks.check_pip_update_available

check_pip_update_available()

Checks if a new version of the ultralytics package is available on PyPI.

Returns:

Type Description
bool

True if an update is available, False otherwise.

Source code in ultralytics/utils/checks.py
def check_pip_update_available():
    """
    Checks if a new version of the ultralytics package is available on PyPI.

    Returns:
        (bool): True if an update is available, False otherwise.
    """
    if ONLINE and IS_PIP_PACKAGE:
        try:
            from ultralytics import __version__

            latest = check_latest_pypi_version()
            if check_version(__version__, f"<{latest}"):  # check if current version is < latest version
                LOGGER.info(
                    f"New https://pypi.org/project/ultralytics/{latest} available 😃 "
                    f"Update with 'pip install -U ultralytics'"
                )
                return True
        except Exception:
            pass
    return False





ultralytics.utils.checks.check_font

check_font(font='Arial.ttf')

Find font locally or download to user's configuration directory if it does not already exist.

Parameters:

Name Type Description Default
font str

Path or name of font.

'Arial.ttf'

Returns:

Name Type Description
file Path

Resolved font file path.

Source code in ultralytics/utils/checks.py
@ThreadingLocked()
def check_font(font="Arial.ttf"):
    """
    Find font locally or download to user's configuration directory if it does not already exist.

    Args:
        font (str): Path or name of font.

    Returns:
        file (Path): Resolved font file path.
    """
    from matplotlib import font_manager

    # Check USER_CONFIG_DIR
    name = Path(font).name
    file = USER_CONFIG_DIR / name
    if file.exists():
        return file

    # Check system fonts
    matches = [s for s in font_manager.findSystemFonts() if font in s]
    if any(matches):
        return matches[0]

    # Download to USER_CONFIG_DIR if missing
    url = f"https://github.com/ultralytics/assets/releases/download/v0.0.0/{name}"
    if downloads.is_url(url, check=True):
        downloads.safe_download(url=url, file=file)
        return file





ultralytics.utils.checks.check_python

check_python(
    minimum: str = "3.8.0", hard: bool = True, verbose: bool = False
) -> bool

Check current python version against the required minimum version.

Parameters:

Name Type Description Default
minimum str

Required minimum version of python.

'3.8.0'
hard bool

If True, raise an AssertionError if the requirement is not met.

True
verbose bool

If True, print warning message if requirement is not met.

False

Returns:

Type Description
bool

Whether the installed Python version meets the minimum constraints.

Source code in ultralytics/utils/checks.py
def check_python(minimum: str = "3.8.0", hard: bool = True, verbose: bool = False) -> bool:
    """
    Check current python version against the required minimum version.

    Args:
        minimum (str): Required minimum version of python.
        hard (bool, optional): If True, raise an AssertionError if the requirement is not met.
        verbose (bool, optional): If True, print warning message if requirement is not met.

    Returns:
        (bool): Whether the installed Python version meets the minimum constraints.
    """
    return check_version(PYTHON_VERSION, minimum, name="Python", hard=hard, verbose=verbose)





ultralytics.utils.checks.check_requirements

check_requirements(
    requirements=ROOT.parent / "requirements.txt",
    exclude=(),
    install=True,
    cmds="",
)

Check if installed dependencies meet YOLOv8 requirements and attempt to auto-update if needed.

Parameters:

Name Type Description Default
requirements Union[Path, str, List[str]]

Path to a requirements.txt file, a single package requirement as a string, or a list of package requirements as strings.

parent / 'requirements.txt'
exclude Tuple[str]

Tuple of package names to exclude from checking.

()
install bool

If True, attempt to auto-update packages that don't meet requirements.

True
cmds str

Additional commands to pass to the pip install command when auto-updating.

''
Example
from ultralytics.utils.checks import check_requirements

# Check a requirements.txt file
check_requirements("path/to/requirements.txt")

# Check a single package
check_requirements("ultralytics>=8.0.0")

# Check multiple packages
check_requirements(["numpy", "ultralytics>=8.0.0"])
Source code in ultralytics/utils/checks.py
@TryExcept()
def check_requirements(requirements=ROOT.parent / "requirements.txt", exclude=(), install=True, cmds=""):
    """
    Check if installed dependencies meet YOLOv8 requirements and attempt to auto-update if needed.

    Args:
        requirements (Union[Path, str, List[str]]): Path to a requirements.txt file, a single package requirement as a
            string, or a list of package requirements as strings.
        exclude (Tuple[str]): Tuple of package names to exclude from checking.
        install (bool): If True, attempt to auto-update packages that don't meet requirements.
        cmds (str): Additional commands to pass to the pip install command when auto-updating.

    Example:
        ```python
        from ultralytics.utils.checks import check_requirements

        # Check a requirements.txt file
        check_requirements("path/to/requirements.txt")

        # Check a single package
        check_requirements("ultralytics>=8.0.0")

        # Check multiple packages
        check_requirements(["numpy", "ultralytics>=8.0.0"])
        ```
    """
    prefix = colorstr("red", "bold", "requirements:")
    if isinstance(requirements, Path):  # requirements.txt file
        file = requirements.resolve()
        assert file.exists(), f"{prefix} {file} not found, check failed."
        requirements = [f"{x.name}{x.specifier}" for x in parse_requirements(file) if x.name not in exclude]
    elif isinstance(requirements, str):
        requirements = [requirements]

    pkgs = []
    for r in requirements:
        r_stripped = r.split("/")[-1].replace(".git", "")  # replace git+https://org/repo.git -> 'repo'
        match = re.match(r"([a-zA-Z0-9-_]+)([<>!=~]+.*)?", r_stripped)
        name, required = match[1], match[2].strip() if match[2] else ""
        try:
            assert check_version(metadata.version(name), required)  # exception if requirements not met
        except (AssertionError, metadata.PackageNotFoundError):
            pkgs.append(r)

    @Retry(times=2, delay=1)
    def attempt_install(packages, commands):
        """Attempt pip install command with retries on failure."""
        return subprocess.check_output(f"pip install --no-cache-dir {packages} {commands}", shell=True).decode()

    s = " ".join(f'"{x}"' for x in pkgs)  # console string
    if s:
        if install and AUTOINSTALL:  # check environment variable
            n = len(pkgs)  # number of packages updates
            LOGGER.info(f"{prefix} Ultralytics requirement{'s' * (n > 1)} {pkgs} not found, attempting AutoUpdate...")
            try:
                t = time.time()
                assert ONLINE, "AutoUpdate skipped (offline)"
                LOGGER.info(attempt_install(s, cmds))
                dt = time.time() - t
                LOGGER.info(
                    f"{prefix} AutoUpdate success ✅ {dt:.1f}s, installed {n} package{'s' * (n > 1)}: {pkgs}\n"
                    f"{prefix} ⚠️ {colorstr('bold', 'Restart runtime or rerun command for updates to take effect')}\n"
                )
            except Exception as e:
                LOGGER.warning(f"{prefix}{e}")
                return False
        else:
            return False

    return True





ultralytics.utils.checks.check_torchvision

check_torchvision()

Checks the installed versions of PyTorch and Torchvision to ensure they're compatible.

This function checks the installed versions of PyTorch and Torchvision, and warns if they're incompatible according to the provided compatibility table based on: https://github.com/pytorch/vision#installation.

The compatibility table is a dictionary where the keys are PyTorch versions and the values are lists of compatible Torchvision versions.

Source code in ultralytics/utils/checks.py
def check_torchvision():
    """
    Checks the installed versions of PyTorch and Torchvision to ensure they're compatible.

    This function checks the installed versions of PyTorch and Torchvision, and warns if they're incompatible according
    to the provided compatibility table based on:
    https://github.com/pytorch/vision#installation.

    The compatibility table is a dictionary where the keys are PyTorch versions and the values are lists of compatible
    Torchvision versions.
    """
    # Compatibility table
    compatibility_table = {
        "2.4": ["0.19"],
        "2.3": ["0.18"],
        "2.2": ["0.17"],
        "2.1": ["0.16"],
        "2.0": ["0.15"],
        "1.13": ["0.14"],
        "1.12": ["0.13"],
    }

    # Extract only the major and minor versions
    v_torch = ".".join(torch.__version__.split("+")[0].split(".")[:2])
    if v_torch in compatibility_table:
        compatible_versions = compatibility_table[v_torch]
        v_torchvision = ".".join(TORCHVISION_VERSION.split("+")[0].split(".")[:2])
        if all(v_torchvision != v for v in compatible_versions):
            print(
                f"WARNING ⚠️ torchvision=={v_torchvision} is incompatible with torch=={v_torch}.\n"
                f"Run 'pip install torchvision=={compatible_versions[0]}' to fix torchvision or "
                "'pip install -U torch torchvision' to update both.\n"
                "For a full compatibility table see https://github.com/pytorch/vision#installation"
            )





ultralytics.utils.checks.check_suffix

check_suffix(file='yolo11n.pt', suffix='.pt', msg='')

Check file(s) for acceptable suffix.

Source code in ultralytics/utils/checks.py
def check_suffix(file="yolo11n.pt", suffix=".pt", msg=""):
    """Check file(s) for acceptable suffix."""
    if file and suffix:
        if isinstance(suffix, str):
            suffix = (suffix,)
        for f in file if isinstance(file, (list, tuple)) else [file]:
            s = Path(f).suffix.lower().strip()  # file suffix
            if len(s):
                assert s in suffix, f"{msg}{f} acceptable suffix is {suffix}, not {s}"





ultralytics.utils.checks.check_yolov5u_filename

check_yolov5u_filename(file: str, verbose: bool = True)

Replace legacy YOLOv5 filenames with updated YOLOv5u filenames.

Source code in ultralytics/utils/checks.py
def check_yolov5u_filename(file: str, verbose: bool = True):
    """Replace legacy YOLOv5 filenames with updated YOLOv5u filenames."""
    if "yolov3" in file or "yolov5" in file:
        if "u.yaml" in file:
            file = file.replace("u.yaml", ".yaml")  # i.e. yolov5nu.yaml -> yolov5n.yaml
        elif ".pt" in file and "u" not in file:
            original_file = file
            file = re.sub(r"(.*yolov5([nsmlx]))\.pt", "\\1u.pt", file)  # i.e. yolov5n.pt -> yolov5nu.pt
            file = re.sub(r"(.*yolov5([nsmlx])6)\.pt", "\\1u.pt", file)  # i.e. yolov5n6.pt -> yolov5n6u.pt
            file = re.sub(r"(.*yolov3(|-tiny|-spp))\.pt", "\\1u.pt", file)  # i.e. yolov3-spp.pt -> yolov3-sppu.pt
            if file != original_file and verbose:
                LOGGER.info(
                    f"PRO TIP 💡 Replace 'model={original_file}' with new 'model={file}'.\nYOLOv5 'u' models are "
                    f"trained with https://github.com/ultralytics/ultralytics and feature improved performance vs "
                    f"standard YOLOv5 models trained with https://github.com/ultralytics/yolov5.\n"
                )
    return file





ultralytics.utils.checks.check_model_file_from_stem

check_model_file_from_stem(model='yolov8n')

Return a model filename from a valid model stem.

Source code in ultralytics/utils/checks.py
def check_model_file_from_stem(model="yolov8n"):
    """Return a model filename from a valid model stem."""
    if model and not Path(model).suffix and Path(model).stem in downloads.GITHUB_ASSETS_STEMS:
        return Path(model).with_suffix(".pt")  # add suffix, i.e. yolov8n -> yolov8n.pt
    else:
        return model





ultralytics.utils.checks.check_file

check_file(file, suffix='', download=True, download_dir='.', hard=True)

Search/download file (if necessary) and return path.

Source code in ultralytics/utils/checks.py
def check_file(file, suffix="", download=True, download_dir=".", hard=True):
    """Search/download file (if necessary) and return path."""
    check_suffix(file, suffix)  # optional
    file = str(file).strip()  # convert to string and strip spaces
    file = check_yolov5u_filename(file)  # yolov5n -> yolov5nu
    if (
        not file
        or ("://" not in file and Path(file).exists())  # '://' check required in Windows Python<3.10
        or file.lower().startswith("grpc://")
    ):  # file exists or gRPC Triton images
        return file
    elif download and file.lower().startswith(("https://", "http://", "rtsp://", "rtmp://", "tcp://")):  # download
        url = file  # warning: Pathlib turns :// -> :/
        file = Path(download_dir) / url2file(file)  # '%2F' to '/', split https://url.com/file.txt?auth
        if file.exists():
            LOGGER.info(f"Found {clean_url(url)} locally at {file}")  # file already exists
        else:
            downloads.safe_download(url=url, file=file, unzip=False)
        return str(file)
    else:  # search
        files = glob.glob(str(ROOT / "**" / file), recursive=True) or glob.glob(str(ROOT.parent / file))  # find file
        if not files and hard:
            raise FileNotFoundError(f"'{file}' does not exist")
        elif len(files) > 1 and hard:
            raise FileNotFoundError(f"Multiple files match '{file}', specify exact path: {files}")
        return files[0] if len(files) else []  # return file





ultralytics.utils.checks.check_yaml

check_yaml(file, suffix=('.yaml', '.yml'), hard=True)

Search/download YAML file (if necessary) and return path, checking suffix.

Source code in ultralytics/utils/checks.py
def check_yaml(file, suffix=(".yaml", ".yml"), hard=True):
    """Search/download YAML file (if necessary) and return path, checking suffix."""
    return check_file(file, suffix, hard=hard)





ultralytics.utils.checks.check_is_path_safe

check_is_path_safe(basedir, path)

Check if the resolved path is under the intended directory to prevent path traversal.

Parameters:

Name Type Description Default
basedir Path | str

The intended directory.

required
path Path | str

The path to check.

required

Returns:

Type Description
bool

True if the path is safe, False otherwise.

Source code in ultralytics/utils/checks.py
def check_is_path_safe(basedir, path):
    """
    Check if the resolved path is under the intended directory to prevent path traversal.

    Args:
        basedir (Path | str): The intended directory.
        path (Path | str): The path to check.

    Returns:
        (bool): True if the path is safe, False otherwise.
    """
    base_dir_resolved = Path(basedir).resolve()
    path_resolved = Path(path).resolve()

    return path_resolved.exists() and path_resolved.parts[: len(base_dir_resolved.parts)] == base_dir_resolved.parts





ultralytics.utils.checks.check_imshow

check_imshow(warn=False)

Check if environment supports image displays.

Source code in ultralytics/utils/checks.py
def check_imshow(warn=False):
    """Check if environment supports image displays."""
    try:
        if LINUX:
            assert not IS_COLAB and not IS_KAGGLE
            assert "DISPLAY" in os.environ, "The DISPLAY environment variable isn't set."
        cv2.imshow("test", np.zeros((8, 8, 3), dtype=np.uint8))  # show a small 8-pixel image
        cv2.waitKey(1)
        cv2.destroyAllWindows()
        cv2.waitKey(1)
        return True
    except Exception as e:
        if warn:
            LOGGER.warning(f"WARNING ⚠️ Environment does not support cv2.imshow() or PIL Image.show()\n{e}")
        return False





ultralytics.utils.checks.check_yolo

check_yolo(verbose=True, device='')

Return a human-readable YOLO software and hardware summary.

Source code in ultralytics/utils/checks.py
def check_yolo(verbose=True, device=""):
    """Return a human-readable YOLO software and hardware summary."""
    import psutil

    from ultralytics.utils.torch_utils import select_device

    if IS_COLAB:
        shutil.rmtree("sample_data", ignore_errors=True)  # remove colab /sample_data directory

    if verbose:
        # System info
        gib = 1 << 30  # bytes per GiB
        ram = psutil.virtual_memory().total
        total, used, free = shutil.disk_usage("/")
        s = f"({os.cpu_count()} CPUs, {ram / gib:.1f} GB RAM, {(total - free) / gib:.1f}/{total / gib:.1f} GB disk)"
        try:
            from IPython import display

            display.clear_output()  # clear display if notebook
        except ImportError:
            pass
    else:
        s = ""

    select_device(device=device, newline=False)
    LOGGER.info(f"Setup complete ✅ {s}")





ultralytics.utils.checks.collect_system_info

collect_system_info()

Collect and print relevant system information including OS, Python, RAM, CPU, and CUDA.

Source code in ultralytics/utils/checks.py
def collect_system_info():
    """Collect and print relevant system information including OS, Python, RAM, CPU, and CUDA."""
    import psutil

    from ultralytics.utils import ENVIRONMENT  # scope to avoid circular import
    from ultralytics.utils.torch_utils import get_cpu_info, get_gpu_info

    gib = 1 << 30  # bytes per GiB
    cuda = torch and torch.cuda.is_available()
    check_yolo()
    total, used, free = shutil.disk_usage("/")

    info_dict = {
        "OS": platform.platform(),
        "Environment": ENVIRONMENT,
        "Python": PYTHON_VERSION,
        "Install": "git" if IS_GIT_DIR else "pip" if IS_PIP_PACKAGE else "other",
        "RAM": f"{psutil.virtual_memory().total / gib:.2f} GB",
        "Disk": f"{(total - free) / gib:.1f}/{total / gib:.1f} GB",
        "CPU": get_cpu_info(),
        "CPU count": os.cpu_count(),
        "GPU": get_gpu_info(index=0) if cuda else None,
        "GPU count": torch.cuda.device_count() if cuda else None,
        "CUDA": torch.version.cuda if cuda else None,
    }
    LOGGER.info("\n" + "\n".join(f"{k:<20}{v}" for k, v in info_dict.items()) + "\n")

    package_info = {}
    for r in parse_requirements(package="ultralytics"):
        try:
            current = metadata.version(r.name)
            is_met = "✅ " if check_version(current, str(r.specifier), name=r.name, hard=True) else "❌ "
        except metadata.PackageNotFoundError:
            current = "(not installed)"
            is_met = "❌ "
        package_info[r.name] = f"{is_met}{current}{r.specifier}"
        LOGGER.info(f"{r.name:<20}{package_info[r.name]}")

    info_dict["Package Info"] = package_info

    if is_github_action_running():
        github_info = {
            "RUNNER_OS": os.getenv("RUNNER_OS"),
            "GITHUB_EVENT_NAME": os.getenv("GITHUB_EVENT_NAME"),
            "GITHUB_WORKFLOW": os.getenv("GITHUB_WORKFLOW"),
            "GITHUB_ACTOR": os.getenv("GITHUB_ACTOR"),
            "GITHUB_REPOSITORY": os.getenv("GITHUB_REPOSITORY"),
            "GITHUB_REPOSITORY_OWNER": os.getenv("GITHUB_REPOSITORY_OWNER"),
        }
        LOGGER.info("\n" + "\n".join(f"{k}: {v}" for k, v in github_info.items()))
        info_dict["GitHub Info"] = github_info

    return info_dict





ultralytics.utils.checks.check_amp

check_amp(model)

Checks the PyTorch Automatic Mixed Precision (AMP) functionality of a YOLO11 model. If the checks fail, it means there are anomalies with AMP on the system that may cause NaN losses or zero-mAP results, so AMP will be disabled during training.

Parameters:

Name Type Description Default
model Module

A YOLO11 model instance.

required
Example
from ultralytics import YOLO
from ultralytics.utils.checks import check_amp

model = YOLO("yolo11n.pt").model.cuda()
check_amp(model)

Returns:

Type Description
bool

Returns True if the AMP functionality works correctly with YOLO11 model, else False.

Source code in ultralytics/utils/checks.py
def check_amp(model):
    """
    Checks the PyTorch Automatic Mixed Precision (AMP) functionality of a YOLO11 model. If the checks fail, it means
    there are anomalies with AMP on the system that may cause NaN losses or zero-mAP results, so AMP will be disabled
    during training.

    Args:
        model (nn.Module): A YOLO11 model instance.

    Example:
        ```python
        from ultralytics import YOLO
        from ultralytics.utils.checks import check_amp

        model = YOLO("yolo11n.pt").model.cuda()
        check_amp(model)
        ```

    Returns:
        (bool): Returns True if the AMP functionality works correctly with YOLO11 model, else False.
    """
    from ultralytics.utils.torch_utils import autocast

    device = next(model.parameters()).device  # get model device
    prefix = colorstr("AMP: ")
    if device.type in {"cpu", "mps"}:
        return False  # AMP only used on CUDA devices
    else:
        # GPUs that have issues with AMP
        pattern = re.compile(
            r"(nvidia|geforce|quadro|tesla).*?(1660|1650|1630|t400|t550|t600|t1000|t1200|t2000|k40m)", re.IGNORECASE
        )

        gpu = torch.cuda.get_device_name(device)
        if bool(pattern.search(gpu)):
            LOGGER.warning(
                f"{prefix}checks failed ❌. AMP training on {gpu} GPU may cause "
                f"NaN losses or zero-mAP results, so AMP will be disabled during training."
            )
            return False

    def amp_allclose(m, im):
        """All close FP32 vs AMP results."""
        batch = [im] * 8
        imgsz = max(256, int(model.stride.max() * 4))  # max stride P5-32 and P6-64
        a = m(batch, imgsz=imgsz, device=device, verbose=False)[0].boxes.data  # FP32 inference
        with autocast(enabled=True):
            b = m(batch, imgsz=imgsz, device=device, verbose=False)[0].boxes.data  # AMP inference
        del m
        return a.shape == b.shape and torch.allclose(a, b.float(), atol=0.5)  # close to 0.5 absolute tolerance

    im = ASSETS / "bus.jpg"  # image to check
    LOGGER.info(f"{prefix}running Automatic Mixed Precision (AMP) checks...")
    warning_msg = "Setting 'amp=True'. If you experience zero-mAP or NaN losses you can disable AMP with amp=False."
    try:
        from ultralytics import YOLO

        assert amp_allclose(YOLO("yolo11n.pt"), im)
        LOGGER.info(f"{prefix}checks passed ✅")
    except ConnectionError:
        LOGGER.warning(
            f"{prefix}checks skipped ⚠️. " f"Offline and unable to download YOLO11n for AMP checks. {warning_msg}"
        )
    except (AttributeError, ModuleNotFoundError):
        LOGGER.warning(
            f"{prefix}checks skipped ⚠️. "
            f"Unable to load YOLO11n for AMP checks due to possible Ultralytics package modifications. {warning_msg}"
        )
    except AssertionError:
        LOGGER.warning(
            f"{prefix}checks failed ❌. Anomalies were detected with AMP on your system that may lead to "
            f"NaN losses or zero-mAP results, so AMP will be disabled during training."
        )
        return False
    return True





ultralytics.utils.checks.git_describe

git_describe(path=ROOT)

Return human-readable git description, i.e. v5.0-5-g3e25f1e https://git-scm.com/docs/git-describe.

Source code in ultralytics/utils/checks.py
def git_describe(path=ROOT):  # path must be a directory
    """Return human-readable git description, i.e. v5.0-5-g3e25f1e https://git-scm.com/docs/git-describe."""
    try:
        return subprocess.check_output(f"git -C {path} describe --tags --long --always", shell=True).decode()[:-1]
    except Exception:
        return ""





ultralytics.utils.checks.print_args

print_args(args: Optional[dict] = None, show_file=True, show_func=False)

Print function arguments (optional args dict).

Source code in ultralytics/utils/checks.py
def print_args(args: Optional[dict] = None, show_file=True, show_func=False):
    """Print function arguments (optional args dict)."""

    def strip_auth(v):
        """Clean longer Ultralytics HUB URLs by stripping potential authentication information."""
        return clean_url(v) if (isinstance(v, str) and v.startswith("http") and len(v) > 100) else v

    x = inspect.currentframe().f_back  # previous frame
    file, _, func, _, _ = inspect.getframeinfo(x)
    if args is None:  # get args automatically
        args, _, _, frm = inspect.getargvalues(x)
        args = {k: v for k, v in frm.items() if k in args}
    try:
        file = Path(file).resolve().relative_to(ROOT).with_suffix("")
    except ValueError:
        file = Path(file).stem
    s = (f"{file}: " if show_file else "") + (f"{func}: " if show_func else "")
    LOGGER.info(colorstr(s) + ", ".join(f"{k}={strip_auth(v)}" for k, v in args.items()))





ultralytics.utils.checks.cuda_device_count

cuda_device_count() -> int

Get the number of NVIDIA GPUs available in the environment.

Returns:

Type Description
int

The number of NVIDIA GPUs available.

Source code in ultralytics/utils/checks.py
def cuda_device_count() -> int:
    """
    Get the number of NVIDIA GPUs available in the environment.

    Returns:
        (int): The number of NVIDIA GPUs available.
    """
    try:
        # Run the nvidia-smi command and capture its output
        output = subprocess.check_output(
            ["nvidia-smi", "--query-gpu=count", "--format=csv,noheader,nounits"], encoding="utf-8"
        )

        # Take the first line and strip any leading/trailing white space
        first_line = output.strip().split("\n")[0]

        return int(first_line)
    except (subprocess.CalledProcessError, FileNotFoundError, ValueError):
        # If the command fails, nvidia-smi is not found, or output is not an integer, assume no GPUs are available
        return 0





ultralytics.utils.checks.cuda_is_available

cuda_is_available() -> bool

Check if CUDA is available in the environment.

Returns:

Type Description
bool

True if one or more NVIDIA GPUs are available, False otherwise.

Source code in ultralytics/utils/checks.py
def cuda_is_available() -> bool:
    """
    Check if CUDA is available in the environment.

    Returns:
        (bool): True if one or more NVIDIA GPUs are available, False otherwise.
    """
    return cuda_device_count() > 0



📅 Created 1 year ago ✏️ Updated 2 months ago