How to use custom_hook method in Slash

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singleton_utils.py

Source:singleton_utils.py

1"""2Easy-to-use methods for getting the singleton SessionHook.3Sample usage:4import smdebug.(pytorch | tensorflow | mxnet) as smd5hook = smd.hook()6"""7# Standard Library8import atexit9# First Party10from smdebug.core.logger import get_logger11logger = get_logger()12_ts_hook = None13def _create_hook(json_config_path, hook_class):14    from smdebug.core.hook import BaseHook  # prevent circular imports15    if not issubclass(hook_class, BaseHook):16        raise TypeError("hook_class needs to be a subclass of BaseHook", hook_class)17    # Either returns a hook or None18    try:19        hook = hook_class.create_from_json_file(json_file_path=json_config_path)20        set_hook(custom_hook=hook)21    except FileNotFoundError:22        pass23def get_hook(*, json_config_path: str, hook_class, create_if_not_exists: bool) -> "Hook":24    """Return a singleton SessionHook or None.25    If the singleton hook exists, we return it. No questions asked, `json_config_path` is a no-op.26    Otherwise return create_from_json_file().27    """28    global _ts_hook29    # Cannot create a hook if hook_class is not passed; invalid to call isinstance(obj, None).30    if hook_class is None:31        if create_if_not_exists:32            raise ValueError("Cannot create hook because hook_class is None")33        return _ts_hook34    # If hooks exists, either return or reset it based on hook_class35    if _ts_hook:36        # Return the hook if it exists and is the right type37        if isinstance(_ts_hook, hook_class):38            return _ts_hook39        # Reset the hook if it is the wrong type (user runs Session, then Estimator in same script).40        else:41            logger.info(f"Current hook is not instance of {hook_class}, so clearing it.")42            _ts_hook = None43    # Create if the user desires44    if create_if_not_exists and not _ts_hook:45        _create_hook(json_config_path, hook_class)46    return _ts_hook47def set_hook(custom_hook: "BaseHook") -> None:48    """Overwrite the current hook with the passed hook."""49    from smdebug.core.hook import BaseHook  # prevent circular imports50    if not isinstance(custom_hook, BaseHook):51        raise TypeError(f"custom_hook={custom_hook} must be type BaseHook")52    global _ts_hook53    _ts_hook = custom_hook54    atexit.register(del_hook)55def del_hook() -> None:56    """ Set the hook singleton to None. """57    global _ts_hook...

hook.py

Source:hook.py

1"""Hook framework in dataduct.2To make a function hookable, add the hook decorator like so:3@hook('hook_name')4def function():5    ...6"""7import os8import imp9import sys10from .helpers import parse_path11def default_before_hook(*args, **kwargs):12    """The default before hook, will act like it's not even there13    """14    return args, kwargs15def default_after_hook(result):16    """The default after hook, will act like it's not even there17    """18    return result19def get_hooks(hook_name):20    """Returns the before hook and after hook (in a tuple) for a particular21    hook name22    """23    from dataduct.config import Config24    config = Config()25    if 'HOOKS_BASE_PATH' not in config.etl:26        return default_before_hook, default_after_hook27    hook_file = parse_path(hook_name + '.py', 'HOOKS_BASE_PATH')28    if not os.path.isfile(hook_file):29        return default_before_hook, default_after_hook30    # Delete the previous custom hook, so the imports are not merged.31    if 'custom_hook' in sys.modules:32        del sys.modules['custom_hook']33    # Get the hook functions, falling back to the default hooks34    custom_hook = imp.load_source('custom_hook', hook_file)35    before_hook = getattr(custom_hook, 'before_hook', default_before_hook)36    after_hook = getattr(custom_hook, 'after_hook', default_after_hook)37    return before_hook, after_hook38def hook(hook_name):39    """The hook decorator creator40    """41    before_hook, after_hook = get_hooks(hook_name)42    def hook_decorator(func):43        """The hook decorator44        """45        def function_wrapper(*args, **kwargs):46            """The hook wrapper for the function47            """48            new_args, new_kwargs = before_hook(*args, **kwargs)49            result = func(*new_args, **new_kwargs)50            new_result = after_hook(result)51            return new_result52        return function_wrapper...

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