

'''simple docstring'''



import contextlib
from multiprocessing import Pool, RLock

from tqdm.auto import tqdm

from ..utils import experimental, logging


_UpperCamelCase						:  Dict							       =				logging.get_logger(__name__)



class 				_snake_case					:
  SCREAMING_SNAKE_CASE			:       List[str]				=     None



@experimental
def       snake_case   (	snake_case      : List[Any]					,		snake_case      : List[Any]					,		snake_case      : Dict					,		snake_case      : List[Any]					,		snake_case      : Dict					,		snake_case      : Optional[Any]					,		snake_case      : Optional[Any]			) ->  str:


    """simple docstring"""


    if ParallelBackendConfig.backend_name is None:
        return _map_with_multiprocessing_pool(
            snake_case					,		snake_case					,		snake_case					,		snake_case					,		snake_case					,		snake_case					,		snake_case			)

    return _map_with_joblib(snake_case					,		snake_case					,		snake_case					,		snake_case					,		snake_case					,		snake_case					,		snake_case			)


def       snake_case   (	snake_case      : str					,		snake_case      : List[Any]					,		snake_case      : Optional[int]					,		snake_case      : Union[str, Any]					,		snake_case      : List[Any]					,		snake_case      : List[str]					,		snake_case      : Tuple			) ->  Dict:


    """simple docstring"""


    lowerCAmelCase 						=							num_proc if num_proc <= len(snake_case			) else len(snake_case			)
    lowerCAmelCase 						=							[]  # We organize the splits ourselve (contiguous splits)
    for index in range(snake_case			):
        lowerCAmelCase 						=							len(snake_case			) // num_proc
        lowerCAmelCase 						=							len(snake_case			) % num_proc
        lowerCAmelCase 						=							div * index + min(snake_case					,		snake_case			)
        lowerCAmelCase 						=							start + div + (1 if index < mod else 0)
        split_kwds.append((function, iterable[start:end], types, index, disable_tqdm, desc)			)

    if len(snake_case			) != sum(len(i[1]			) for i in split_kwds			):
        raise ValueError(
            F'Error dividing inputs iterable among processes. '
            F'Total number of objects {len(snake_case			)}, '
            F'length: {sum(len(i[1]			) for i in split_kwds			)}'			)

    logger.info(
        F'Spawning {num_proc} processes for {len(snake_case			)} objects in slices of {[len(i[1]			) for i in split_kwds]}'			)
    lowerCAmelCase						,   lowerCAmelCase 						=							None, None
    if not disable_tqdm:
        lowerCAmelCase						,   lowerCAmelCase 						=							(RLock(),), tqdm.set_lock
    with Pool(snake_case					,		initargs=snake_case					,		initializer=snake_case			) as pool:
        lowerCAmelCase 						=							pool.map(snake_case					,		snake_case			)
    logger.info(F'Finished {num_proc} processes'			)
    lowerCAmelCase 						=							[obj for proc_res in mapped for obj in proc_res]
    logger.info(F'Unpacked {len(snake_case			)} objects'			)

    return mapped


def       snake_case   (	snake_case      : List[str]					,		snake_case      : List[Any]					,		snake_case      : Optional[int]					,		snake_case      : List[str]					,		snake_case      : Tuple					,		snake_case      : Dict					,		snake_case      : Any			) ->  Any:


    """simple docstring"""


    import joblib

    with joblib.parallel_backend(ParallelBackendConfig.backend_name					,		n_jobs=snake_case			):
        return joblib.Parallel()(
            joblib.delayed(snake_case			)((function, obj, types, None, True, None)			) for obj in iterable			)


@experimental
@contextlib.contextmanager
def       snake_case   (	snake_case      : str			) ->  Dict:


    """simple docstring"""


    lowerCAmelCase 						=							backend_name

    if backend_name == "spark":
        from joblibspark import register_spark

        register_spark()

        # TODO: call create_cache_and_write_probe if "download" in steps
        # TODO: raise NotImplementedError when Dataset.map etc is called

    try:
        yield
    finally:
        lowerCAmelCase 						=							None








'''simple docstring'''



def       snake_case   (	snake_case      : dict			) ->  set:


    """simple docstring"""


    lowerCAmelCase 						=							set()
    # edges = list of graph's edges
    lowerCAmelCase 						=							get_edges(snake_case			)

    # While there are still elements in edges list, take an arbitrary edge
    # (from_node, to_node) and add his extremity to chosen_vertices and then
    # remove all arcs adjacent to the from_node and to_node
    while edges:
        lowerCAmelCase						,   lowerCAmelCase 						=							edges.pop()
        chosen_vertices.add(snake_case			)
        chosen_vertices.add(snake_case			)
        for edge in edges.copy():
            if from_node in edge or to_node in edge:
                edges.discard(snake_case			)
    return chosen_vertices


def       snake_case   (	snake_case      : dict			) ->  set:


    """simple docstring"""


    lowerCAmelCase 						=							set()
    for from_node, to_nodes in graph.items():
        for to_node in to_nodes:
            edges.add((from_node, to_node)			)
    return edges


if __name__ == "__main__":
     import doctest

     doctest.testmod()

     # graph = {0: [1, 3], 1: [0, 3], 2: [0, 3, 4], 3: [0, 1, 2], 4: [2, 3]}
     # print(f"Matching vertex cover:\n{matching_min_vertex_cover(graph)}")





