Source code for flwr_datasets.partitioner.partitioner
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"""Partitioner class that works with Hugging Face Datasets."""
from abc import ABC, abstractmethod
from typing import Optional
from datasets import Dataset
[docs]class Partitioner(ABC):
"""The base partitioner class that enables obtaining federated partitions.
The initialization is intended to take all necessary arguments such that the call to
the `load_partition` method can be used in the same way for all partitioners.
"""
def __init__(self) -> None:
self._dataset: Optional[Dataset] = None
@property
def dataset(self) -> Dataset:
"""Dataset property."""
if self._dataset is None:
raise AttributeError(
"The dataset field should be set before using it (directly, via "
"`load_partition` or some other method). "
)
return self._dataset
@dataset.setter
def dataset(self, value: Dataset) -> None:
if self._dataset is not None:
raise Exception(
"The dataset should be assigned only once to the partitioner."
"This operation might also wipe out the saved references to the "
"created partitions (in case the partitioning scheme needs to create "
"the full partitioning also in order to return a single partition)."
)
self._dataset = value
[docs] @abstractmethod
def load_partition(self, partition_id: int) -> Dataset:
"""Load a single partition based on the partition index.
Parameters
----------
partition_id : int
the index that corresponds to the requested partition
Returns
-------
dataset_partition : Dataset
single dataset partition
"""
[docs] def is_dataset_assigned(self) -> bool:
"""Check if a dataset has been assigned to the partitioner.
This method returns True if a dataset is already set for the partitioner,
otherwise, it returns False.
Returns
-------
dataset_assigned : bool
True if a dataset is assigned, otherwise False.
"""
return self._dataset is not None
@property
@abstractmethod
def num_partitions(self) -> int:
"""Total number of partitions."""