How to use the zict.Func function in zict

def __init__(self, worker, target_memory, storage_path):
        self.worker = worker
        # Build exact chain that dask already provides,
        # Fill local memory to target then spill to disk
        file = zict.File(storage_path)
        self.slow = zict.Func(partial(protocol.serialize_bytelist, on_error='raise'), protocol.deserialize_bytes, file)

        self.fast = LocalStore()

        self.l1 = zict.Buffer(self.fast, self.slow, target_memory, lambda x, y: safe_sizeof(y))

        logger.info(f'Setting fast store memory limit {target_memory} bytes and disk spill path {storage_path}')

        self.l2 = redis.client.Redis(REDIS_HOST, int(REDIS_PORT), int(REDIS_DB))

self.host_func = dict()
        self.disk_func = Func(
            functools.partial(serialize_bytelist, on_error="raise"),
            deserialize_bytes,
            File(self.disk_func_path),
        )
        if memory_limit == 0:
            self.host_buffer = self.host_func
        else:
            self.host_buffer = Buffer(
                self.host_func, self.disk_func, memory_limit, weight=weight
            )

        self.device_keys = set()
        self.device_func = dict()
        self.device_host_func = Func(device_to_host, host_to_device, self.host_buffer)
        self.device_buffer = Buffer(
            self.device_func, self.device_host_func, device_memory_limit, weight=weight
        )

        self.device = self.device_buffer.fast.d
        self.host = self.host_buffer if memory_limit == 0 else self.host_buffer.fast.d
        self.disk = None if memory_limit == 0 else self.host_buffer.slow.d

        # For Worker compatibility only, where `fast` is host memory buffer
        self.fast = self.host_buffer if memory_limit == 0 else self.host_buffer.fast

def setup(self, worker):
        self.cache = Buffer(
            fast={},
            slow=Func(
                dump=blosc.pack_array,
                load=blosc.unpack_array,
                d=Buffer(
                    fast={},
                    slow=LRU(
                        n=self._maxdisk,
                        d=File(os.path.join(worker.local_directory, 'cache')),
                        weight=lambda k, v: len(v),
                    ),
                    n=self._maxcompressed,
                    weight=lambda k, v: len(v),
                ),
            ),
            n=self._maxmem,
            weight=lambda k, v: v.nbytes,
        )

def __init__(
        self, device_memory_limit=None, memory_limit=None, local_directory=None,
    ):
        if local_directory is None:
            local_directory = dask.config.get("temporary-directory") or os.getcwd()

        if not os.path.exists(local_directory):
            os.makedirs(local_directory, exist_ok=True)
        local_directory = os.path.join(local_directory, "dask-worker-space")

        self.disk_func_path = os.path.join(local_directory, "storage")

        self.host_func = dict()
        self.disk_func = Func(
            functools.partial(serialize_bytelist, on_error="raise"),
            deserialize_bytes,
            File(self.disk_func_path),
        )
        if memory_limit == 0:
            self.host_buffer = self.host_func
        else:
            self.host_buffer = Buffer(
                self.host_func, self.disk_func, memory_limit, weight=weight
            )

        self.device_keys = set()
        self.device_func = dict()
        self.device_host_func = Func(device_to_host, host_to_device, self.host_buffer)
        self.device_buffer = Buffer(
            self.device_func, self.device_host_func, device_memory_limit, weight=weight

self.data = data
        elif callable(data):
            self.data = data()
        elif isinstance(data, tuple):
            self.data = data[0](**data[1])
        elif self.memory_limit and (
            self.memory_target_fraction or self.memory_spill_fraction
        ):
            try:
                from zict import Buffer, File, Func
            except ImportError:
                raise ImportError(
                    "Please `python -m pip install zict` for spill-to-disk workers"
                )
            path = os.path.join(self.local_directory, "storage")
            storage = Func(
                partial(serialize_bytelist, on_error="raise"),
                deserialize_bytes,
                File(path),
            )
            target = int(float(self.memory_limit) * self.memory_target_fraction)
            self.data = Buffer({}, storage, target, weight)
            self.data.memory = self.data.fast
            self.data.disk = self.data.slow
        else:
            self.data = dict()

        self.actors = {}
        self.loop = loop or IOLoop.current()
        self.reconnect = reconnect
        self.executor = executor or ThreadPoolExecutor(
            self.nthreads, thread_name_prefix="Dask-Worker-Threads'"