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# coding: utf-8
# pylint: disable=
"""Text datasets."""
__all__ = ['WikiText2', 'WikiText103']
import io
import os
import zipfile
import shutil
import numpy as np
from . import _constants as C
from ...data import dataset
from ...utils import download, check_sha1, _get_repo_file_url
from ....contrib import text
from .... import nd
class _LanguageModelDataset(dataset._DownloadedDataset): # pylint: disable=abstract-method
def __init__(self, root, namespace, vocabulary):
self._vocab = vocabulary
self._counter = None
self._namespace = namespace
super(_LanguageModelDataset, self).__init__(root, None)
@property
def vocabulary(self):
return self._vocab
@property
def frequencies(self):
return self._counter
def _build_vocab(self, content):
if not self._counter:
self._counter = text.utils.count_tokens_from_str(content)
if not self._vocab:
self._vocab = text.vocab.Vocabulary(counter=self.frequencies,
reserved_tokens=[C.EOS_TOKEN])
class _WikiText(_LanguageModelDataset):
def _read_batch(self, filename):
with io.open(filename, 'r', encoding='utf8') as fin:
content = fin.read()
self._build_vocab(content)
raw_data = [line for line in [x.strip().split() for x in content.splitlines()]
if line]
for line in raw_data:
line.append(C.EOS_TOKEN)
raw_data = self.vocabulary.to_indices([x for line in raw_data for x in line if x])
data = raw_data[0:-1]
label = raw_data[1:]
return np.array(data, dtype=np.int32), np.array(label, dtype=np.int32)
def _get_data(self):
archive_file_name, archive_hash = self._archive_file
data_file_name, data_hash = self._data_file[self._segment]
path = os.path.join(self._root, data_file_name)
if not os.path.exists(path) or not check_sha1(path, data_hash):
namespace = 'gluon/dataset/'+self._namespace
downloaded_file_path = download(_get_repo_file_url(namespace, archive_file_name),
path=self._root,
sha1_hash=archive_hash)
with zipfile.ZipFile(downloaded_file_path, 'r') as zf:
for member in zf.namelist():
filename = os.path.basename(member)
if filename:
dest = os.path.join(self._root, filename)
with zf.open(member) as source, \
open(dest, "wb") as target:
shutil.copyfileobj(source, target)
data, label = self._read_batch(path)
self._data = nd.array(data, dtype=data.dtype).reshape((-1, self._seq_len))
self._label = nd.array(label, dtype=label.dtype).reshape((-1, self._seq_len))
def __getitem__(self, idx):
return self._data[idx], self._label[idx]
def __len__(self):
return len(self._label)
[docs]class WikiText2(_WikiText):
"""WikiText-2 word-level dataset for language modeling, from Salesforce research.
From
https://einstein.ai/research/the-wikitext-long-term-dependency-language-modeling-dataset
License: Creative Commons Attribution-ShareAlike
Each sample is a vector of length equal to the specified sequence length.
At the end of each sentence, an end-of-sentence token '' is added.
Parameters
----------
root : str, default '~/.mxnet/datasets/wikitext-2'
Path to temp folder for storing data.
segment : str, default 'train'
Dataset segment. Options are 'train', 'validation', 'test'.
vocab : :class:`~mxnet.contrib.text.vocab.Vocabulary`, default None
The vocabulary to use for indexing the text dataset.
If None, a default vocabulary is created.
seq_len : int, default 35
The sequence length of each sample, regardless of the sentence boundary.
"""
def __init__(self, root=os.path.join('~', '.mxnet', 'datasets', 'wikitext-2'),
segment='train', vocab=None, seq_len=35):
self._archive_file = ('wikitext-2-v1.zip', '3c914d17d80b1459be871a5039ac23e752a53cbe')
self._data_file = {'train': ('wiki.train.tokens',
'863f29c46ef9d167fff4940ec821195882fe29d1'),
'validation': ('wiki.valid.tokens',
'0418625c8b4da6e4b5c7a0b9e78d4ae8f7ee5422'),
'test': ('wiki.test.tokens',
'c7b8ce0aa086fb34dab808c5c49224211eb2b172')}
self._segment = segment
self._seq_len = seq_len
super(WikiText2, self).__init__(root, 'wikitext-2', vocab)
[docs]class WikiText103(_WikiText):
"""WikiText-103 word-level dataset for language modeling, from Salesforce research.
From
https://einstein.ai/research/the-wikitext-long-term-dependency-language-modeling-dataset
License: Creative Commons Attribution-ShareAlike
Each sample is a vector of length equal to the specified sequence length.
At the end of each sentence, an end-of-sentence token '' is added.
Parameters
----------
root : str, default '~/.mxnet/datasets/wikitext-103'
Path to temp folder for storing data.
segment : str, default 'train'
Dataset segment. Options are 'train', 'validation', 'test'.
vocab : :class:`~mxnet.contrib.text.vocab.Vocabulary`, default None
The vocabulary to use for indexing the text dataset.
If None, a default vocabulary is created.
seq_len : int, default 35
The sequence length of each sample, regardless of the sentence boundary.
"""
def __init__(self, root=os.path.join('~', '.mxnet', 'datasets', 'wikitext-103'),
segment='train', vocab=None, seq_len=35):
self._archive_file = ('wikitext-103-v1.zip', '0aec09a7537b58d4bb65362fee27650eeaba625a')
self._data_file = {'train': ('wiki.train.tokens',
'b7497e2dfe77e72cfef5e3dbc61b7b53712ac211'),
'validation': ('wiki.valid.tokens',
'c326ac59dc587676d58c422eb8a03e119582f92b'),
'test': ('wiki.test.tokens',
'8a5befc548865cec54ed4273cf87dbbad60d1e47')}
self._segment = segment
self._seq_len = seq_len
super(WikiText103, self).__init__(root, 'wikitext-103', vocab)
