Datasets:
wiki_split

	"""TODO(wiki_split): Add a description here."""

	from __future__ import absolute_import, division, print_function

	import csv
	import os

	import datasets


	# TODO(wiki_split): BibTeX citation
	_CITATION = """\
	@InProceedings{BothaEtAl2018,
	title = {{Learning To Split and Rephrase From Wikipedia Edit History}},
	author = {Botha, Jan A and Faruqui, Manaal and Alex, John and Baldridge, Jason and Das, Dipanjan},
	booktitle = {Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing},
	pages = {to appear},
	note = {arXiv preprint arXiv:1808.09468},
	year = {2018}
	}
	"""

	# TODO(wiki_split):
	_DESCRIPTION = """\
	One million English sentences, each split into two sentences that together preserve the original meaning, extracted from Wikipedia
	Google's WikiSplit dataset was constructed automatically from the publicly available Wikipedia revision history. Although
	the dataset contains some inherent noise, it can serve as valuable training data for models that split or merge sentences.
	"""
	_URL = "https://github.com/google-research-datasets/wiki-split/raw/master"
	_TRAIN_FILE = "train.tsv.zip"
	_TEST_FILE = "test.tsv"
	_DEV_FILE = "validation.tsv"


	class WikiSplit(datasets.GeneratorBasedBuilder):
	"""TODO(wiki_split): Short description of my dataset."""

	# TODO(wiki_split): Set up version.
	VERSION = datasets.Version("0.1.0")

	def _info(self):
	# TODO(wiki_split): Specifies the datasets.DatasetInfo object
	return datasets.DatasetInfo(
	# This is the description that will appear on the datasets page.
	description=_DESCRIPTION,
	# datasets.features.FeatureConnectors
	features=datasets.Features(
	{
	"complex_sentence": datasets.Value("string"),
	"simple_sentence_1": datasets.Value("string"),
	"simple_sentence_2": datasets.Value("string"),
	# These are the features of your dataset like images, labels ...
	}
	),
	# If there's a common (input, target) tuple from the features,
	# specify them here. They'll be used if as_supervised=True in
	# builder.as_dataset.
	supervised_keys=None,
	# Homepage of the dataset for documentation
	homepage="https://dataset-homepage/",
	citation=_CITATION,
	)

	def _split_generators(self, dl_manager):
	"""Returns SplitGenerators."""
	# TODO(wiki_split): Downloads the data and defines the splits
	# dl_manager is a datasets.download.DownloadManager that can be used to
	# download and extract URLs
	urls_to_download = {
	"train": os.path.join(_URL, _TRAIN_FILE),
	"test": os.path.join(_URL, _TEST_FILE),
	"dev": os.path.join(_URL, _DEV_FILE),
	}
	dl_dir = dl_manager.download_and_extract(urls_to_download)
	return [
	datasets.SplitGenerator(
	name=datasets.Split.TRAIN,
	# These kwargs will be passed to _generate_examples
	gen_kwargs={"filepath": os.path.join(dl_dir["train"], "train.tsv")},
	),
	datasets.SplitGenerator(
	name=datasets.Split.TEST,
	# These kwargs will be passed to _generate_examples
	gen_kwargs={"filepath": dl_dir["test"]},
	),
	datasets.SplitGenerator(
	name=datasets.Split.VALIDATION,
	# These kwargs will be passed to _generate_examples
	gen_kwargs={"filepath": dl_dir["dev"]},
	),
	]

	def _generate_examples(self, filepath):
	"""Yields examples."""
	# TODO(wiki_split): Yields (key, example) tuples from the dataset
	with open(filepath, encoding="utf-8") as f:
	data = csv.reader(f, delimiter="\t")
	# data = csv.reader(f, delimiter='\t')

	for id_, row in enumerate(data):
	yield id_, {
	"complex_sentence": row[0],
	"simple_sentence_1": row[1].split("<::::>")[0],
	"simple_sentence_2": row[1].split("<::::>")[1],
	}