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from functools import partial
import itertools
from multiprocessing import Pool
from typing import Any, Callable, Dict, Iterable, Tuple, Union
import numpy as np
import tensorflow as tf
import tensorflow_datasets as tfds
from tensorflow_datasets.core import (
dataset_builder,
download,
example_serializer,
file_adapters,
naming,
)
from tensorflow_datasets.core import split_builder as split_builder_lib
from tensorflow_datasets.core import splits as splits_lib
from tensorflow_datasets.core import utils
from tensorflow_datasets.core import writer as writer_lib
Key = Union[str, int]
# The nested example dict passed to `features.encode_example`
Example = Dict[str, Any]
KeyExample = Tuple[Key, Example]
class MultiThreadedAdhocDatasetBuilder(tfds.core.dataset_builders.AdhocBuilder):
"""Multithreaded adhoc dataset builder."""
def __init__(
self, *args, generator_fcn, n_workers, max_episodes_in_memory, **kwargs
):
super().__init__(*args, **kwargs)
self._generator_fcn = generator_fcn
self._n_workers = n_workers
self._max_episodes_in_memory = max_episodes_in_memory
def _download_and_prepare( # pytype: disable=signature-mismatch # overriding-parameter-type-checks
self,
dl_manager: download.DownloadManager,
download_config: download.DownloadConfig,
) -> None:
"""Generate all splits and returns the computed split infos."""
assert (
self._max_episodes_in_memory % self._n_workers == 0
) # need to divide max_episodes by workers
split_builder = ParallelSplitBuilder(
split_dict=self._split_datasets,
features=self.info.features,
dataset_size=self.info.dataset_size,
max_examples_per_split=download_config.max_examples_per_split,
beam_options=download_config.beam_options,
beam_runner=download_config.beam_runner,
file_format=self.info.file_format,
shard_config=download_config.get_shard_config(),
generator_fcn=self._generator_fcn,
n_workers=self._n_workers,
max_episodes_in_memory=self._max_episodes_in_memory,
)
split_generators = self._split_generators(dl_manager)
split_generators = split_builder.normalize_legacy_split_generators(
split_generators=split_generators,
generator_fn=self._generate_examples,
is_beam=False,
)
dataset_builder._check_split_names(split_generators.keys())
# Start generating data for all splits
path_suffix = file_adapters.ADAPTER_FOR_FORMAT[
self.info.file_format
].FILE_SUFFIX
split_info_futures = []
for split_name, generator in utils.tqdm(
split_generators.items(),
desc="Generating splits...",
unit=" splits",
leave=False,
):
filename_template = naming.ShardedFileTemplate(
split=split_name,
dataset_name=self.name,
data_dir=self.data_path,
filetype_suffix=path_suffix,
)
future = split_builder.submit_split_generation(
split_name=split_name,
generator=generator,
filename_template=filename_template,
disable_shuffling=self.info.disable_shuffling,
)
split_info_futures.append(future)
# Finalize the splits (after apache beam completed, if it was used)
split_infos = [future.result() for future in split_info_futures]
# Update the info object with the splits.
split_dict = splits_lib.SplitDict(split_infos)
self.info.set_splits(split_dict)
def _split_generators(self, dl_manager: tfds.download.DownloadManager):
"""Define dummy split generators."""
def dummy_generator():
yield None
return {split: dummy_generator() for split in self._split_datasets}
class _SplitInfoFuture:
"""Future containing the `tfds.core.SplitInfo` result."""
def __init__(self, callback: Callable[[], splits_lib.SplitInfo]):
self._callback = callback
def result(self) -> splits_lib.SplitInfo:
return self._callback()
def parse_examples_from_generator(
episodes, max_episodes, fcn, split_name, total_num_examples, features, serializer
):
upper = episodes[-1] + 1
upper_str = f'{upper}' if upper < max_episodes else ''
generator = fcn(split=split_name + f"[{episodes[0]}:{upper_str}]")
outputs = []
for key, sample in utils.tqdm(
zip(episodes, generator),
desc=f"Generating {split_name} examples...",
unit=" examples",
total=total_num_examples,
leave=False,
mininterval=1.0,
):
if sample is None:
continue
try:
sample = features.encode_example(sample)
except Exception as e: # pylint: disable=broad-except
utils.reraise(e, prefix=f"Failed to encode example:\n{sample}\n")
outputs.append((str(key), serializer.serialize_example(sample)))
return outputs
class ParallelSplitBuilder(split_builder_lib.SplitBuilder):
def __init__(
self, *args, generator_fcn, n_workers, max_episodes_in_memory, **kwargs
):
super().__init__(*args, **kwargs)
self._generator_fcn = generator_fcn
self._n_workers = n_workers
self._max_episodes_in_memory = max_episodes_in_memory
def _build_from_generator(
self,
split_name: str,
generator: Iterable[KeyExample],
filename_template: naming.ShardedFileTemplate,
disable_shuffling: bool,
) -> _SplitInfoFuture:
"""Split generator for example generators.
Args:
split_name: str,
generator: Iterable[KeyExample],
filename_template: Template to format the filename for a shard.
disable_shuffling: Specifies whether to shuffle the examples,
Returns:
future: The future containing the `tfds.core.SplitInfo`.
"""
total_num_examples = None
serialized_info = self._features.get_serialized_info()
writer = writer_lib.Writer(
serializer=example_serializer.ExampleSerializer(serialized_info),
filename_template=filename_template,
hash_salt=split_name,
disable_shuffling=disable_shuffling,
file_format=self._file_format,
shard_config=self._shard_config,
)
del generator # use parallel generators instead
episode_lists = chunk_max(
list(np.arange(self._split_dict[split_name].num_examples)),
self._n_workers,
self._max_episodes_in_memory,
) # generate N episode lists
print(f"Generating with {self._n_workers} workers!")
pool = Pool(processes=self._n_workers)
for i, episodes in enumerate(episode_lists):
print(f"Processing chunk {i + 1} of {len(episode_lists)}.")
results = pool.map(
partial(
parse_examples_from_generator,
fcn=self._generator_fcn,
split_name=split_name,
total_num_examples=total_num_examples,
serializer=writer._serializer,
features=self._features,
max_episodes=self._split_dict[split_name].num_examples,
),
episodes,
)
# write results to shuffler --> this will automatically offload to disk if necessary
print("Writing conversion results...")
for result in itertools.chain(*results):
key, serialized_example = result
writer._shuffler.add(key, serialized_example)
writer._num_examples += 1
pool.close()
print("Finishing split conversion...")
shard_lengths, total_size = writer.finalize()
split_info = splits_lib.SplitInfo(
name=split_name,
shard_lengths=shard_lengths,
num_bytes=total_size,
filename_template=filename_template,
)
return _SplitInfoFuture(lambda: split_info)
def dictlist2listdict(DL):
"Converts a dict of lists to a list of dicts"
return [dict(zip(DL, t)) for t in zip(*DL.values())]
def chunks(l, n):
"""Yield n number of sequential chunks from l."""
d, r = divmod(len(l), n)
for i in range(n):
si = (d + 1) * (i if i < r else r) + d * (0 if i < r else i - r)
yield l[si : si + (d + 1 if i < r else d)]
def chunk_max(l, n, max_chunk_sum):
out = []
for _ in range(int(np.ceil(len(l) / max_chunk_sum))):
out.append([c for c in chunks(l[:max_chunk_sum], n) if c])
l = l[max_chunk_sum:]
return out
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