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# Copyright 2023 OpenMined. | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
"""Contains dataset summary and the computation of the summary.""" | ||
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import pipeline_dp | ||
import dataclasses | ||
from typing import Iterable | ||
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@dataclasses.dataclass | ||
class PublicPartitionsSummary: | ||
num_dataset_public_partitions: int | ||
num_dataset_non_public_partitions: int | ||
num_empty_public_partitions: int | ||
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_DATASET_PUBLIC = 1 | ||
_EMPTY_PUBLIC = 2 | ||
_DATASET_NONPUBLIC = 3 | ||
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def compute_public_partitions_summary(col, backend: pipeline_dp.PipelineBackend, | ||
extractors: pipeline_dp.DataExtractors, | ||
public_partitions): | ||
"""Computes Public Partitions Summary from dataset and public partitions. | ||
Args: | ||
col: the raw dataset. The collection where all elements are of the same | ||
type. | ||
backend: pipeline backend which corresponds to the type of 'col'. | ||
extractors: functions that extract needed pieces of information | ||
from elements of 'col'. | ||
public_partitions: a collection of partition keys that will be present | ||
in the result. If not provided, partitions will be selected in a DP | ||
manner. | ||
Returns: | ||
1 element collection, which contains a PublicPartitionsSummary object. | ||
""" | ||
dataset_partitions = backend.map(col, extractors.partition_extractor, | ||
"Extract partitions") | ||
# (partition) | ||
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dataset_partitions = backend.distinct(dataset_partitions, "Distinct") | ||
# (partition) | ||
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dataset_partitions = backend.map(dataset_partitions, lambda x: (x, True), | ||
"Keyed by partition") | ||
# (partition, is_from_dataset=True) | ||
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public_partitions = backend.map(public_partitions, lambda x: (x, False), | ||
"Keyed by partition") | ||
# (partition, is_from_dataset = False) | ||
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partitions = backend.flatten([dataset_partitions, public_partitions], | ||
"flatten") | ||
# (partition, is_from_dataset: bool) | ||
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col = backend.group_by_key(partitions, "Group by Key") | ||
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# (partition, Iterable) | ||
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def process_fn(_, a: Iterable[bool]) -> int: | ||
# a contains up to 2 booleans. | ||
# True means that the partition is dataset. | ||
# False means that the partition is in public partitions. | ||
a = list(a) | ||
if len(a) == 2: | ||
return _DATASET_PUBLIC | ||
if a[0]: | ||
return _DATASET_NONPUBLIC | ||
return _EMPTY_PUBLIC | ||
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col = backend.map_tuple(col, process_fn, "Get Partition Type") | ||
# (partition_type:int) | ||
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col = backend.count_per_element(col, "Count partition types") | ||
# (partition_type:int, count_partition_type:int) | ||
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col = backend.to_list(col, "To list") | ||
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# 1 element with list of tuples (partition_type, count_partition_type) | ||
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def to_summary(partition_types_count: list) -> PublicPartitionsSummary: | ||
num_dataset_public = num_dataset_non_public = num_empty_public = 0 | ||
for type, count in partition_types_count: | ||
if type == _DATASET_PUBLIC: | ||
num_dataset_public = count | ||
elif type == _DATASET_NONPUBLIC: | ||
num_dataset_non_public = count | ||
else: | ||
num_empty_public = count | ||
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return PublicPartitionsSummary(num_dataset_public, | ||
num_dataset_non_public, num_empty_public) | ||
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return backend.map(col, to_summary, "ToSummary") |
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