tff.simulation.datasets.FilePerUserClientData

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A tff.simulation.datasets.ClientData that maps a set of files to a dataset.

Inherits From: ClientData

tff.simulation.datasets.FilePerUserClientData(
    client_ids_to_files: Mapping[str, str],
    dataset_fn: Callable[[str], tf.data.Dataset]
)

This mapping is restricted to one file per user.

Args
client_ids_to_files	A mapping from string client IDs to filepaths containing the user's data.
dataset_fn	A factory function that takes a filepath (must accept both strings and tensors) and returns a tf.data.Dataset corresponding to this path.

Attributes
client_ids	A list of string identifiers for clients in this dataset.
dataset_computation	A tff.Computation accepting a client ID, returning a dataset.
element_type_structure	The element type information of the client datasets. elements returned by datasets in this ClientData object.
serializable_dataset_fn	Creates a tf.data.Dataset for a client in a TF-serializable manner.

Methods

create_from_dir

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@classmethod
create_from_dir(
    path, create_tf_dataset_fn=tf.data.TFRecordDataset
)

Builds a tff.simulation.datasets.FilePerUserClientData.

Iterates over all files in path, using the filename as the client ID. Does not recursively search path.

Args
path	A directory path to search for per-client files.
create_tf_dataset_fn	A callable that creates a tf.data.Datasaet object for a given file in the directory specified in path.

Returns
A tff.simulation.datasets.FilePerUserClientData object.

create_tf_dataset_for_client

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create_tf_dataset_for_client(
    client_id: str
) -> tf.data.Dataset

Creates a new tf.data.Dataset containing the client training examples.

This function will create a dataset for a given client if client_id is contained in the client_ids property of the FilePerUserClientData. Unlike self.serializable_dataset_fn, this method is not serializable.

Args
client_id	The string identifier for the desired client.

Returns
A tf.data.Dataset object.

create_tf_dataset_from_all_clients

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create_tf_dataset_from_all_clients(
    seed: Optional[Union[int, Sequence[int]]] = None
) -> tf.data.Dataset

Creates a new tf.data.Dataset containing all client examples.

This function is intended for use training centralized, non-distributed models (num_clients=1). This can be useful as a point of comparison against federated models.

Currently, the implementation produces a dataset that contains all examples from a single client in order, and so generally additional shuffling should be performed.

Args
seed	Optional, a seed to determine the order in which clients are processed in the joined dataset. The seed can be any nonnegative 32-bit integer, an array of such integers, or None.

Returns
A tf.data.Dataset object.

datasets

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datasets(
    limit_count: Optional[int] = None,
    seed: Optional[Union[int, Sequence[int]]] = None
) -> Iterable[tf.data.Dataset]

Yields the tf.data.Dataset for each client in random order.

This function is intended for use building a static array of client data to be provided to the top-level federated computation.

Args
limit_count	Optional, a maximum number of datasets to return.
seed	Optional, a seed to determine the order in which clients are processed in the joined dataset. The seed can be any nonnegative 32-bit integer, an array of such integers, or None.

from_clients_and_tf_fn

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@classmethod
from_clients_and_tf_fn(
    client_ids: Iterable[str],
    serializable_dataset_fn: Callable[[str], tf.data.Dataset]
) -> 'ClientData'

Constructs a ClientData based on the given function.

Args
client_ids	A non-empty list of strings to use as input to create_dataset_fn.
serializable_dataset_fn	A function that takes a client_id from the above list, and returns a tf.data.Dataset. This function must be serializable and usable within the context of a tf.function and tff.Computation.

Raises
TypeError	If serializable_dataset_fn is a tff.Computation.

Returns
A ClientData object.

preprocess

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preprocess(
    preprocess_fn: Callable[[tf.data.Dataset], tf.data.Dataset]
) -> 'ClientData'

Applies preprocess_fn to each client's data.

Args
preprocess_fn	A callable accepting a tf.data.Dataset and returning a preprocessed tf.data.Dataset. This function must be traceable by TF.

Returns
A tff.simulation.datasets.ClientData.

Raises
IncompatiblePreprocessFnError	If preprocess_fn is a tff.Computation.

train_test_client_split

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@classmethod
train_test_client_split(
    client_data: 'ClientData',
    num_test_clients: int,
    seed: Optional[Union[int, Sequence[int]]] = None
) -> tuple['ClientData', 'ClientData']

Returns a pair of (train, test) ClientData.

This method partitions the clients of client_data into two ClientData objects with disjoint sets of ClientData.client_ids. All clients in the test ClientData are guaranteed to have non-empty datasets, but the training ClientData may have clients with no data.

Args
client_data	The base ClientData to split.
num_test_clients	How many clients to hold out for testing. This can be at most len(client_data.client_ids) - 1, since we don't want to produce empty ClientData.
seed	Optional seed to fix shuffling of clients before splitting. The seed can be any nonnegative 32-bit integer, an array of such integers, or None.

Returns
A pair (train_client_data, test_client_data), where test_client_data has num_test_clients selected at random, subject to the constraint they each have at least 1 batch in their dataset.

Raises
ValueError	If num_test_clients cannot be satistifed by client_data, or too many clients have empty datasets.