ibeltagy / text

Data loaders and abstractions for text and NLP

torchtext

This repository consists of:

• torchtext.data: Generic data loaders, abstractions, and iterators for text (including vocabulary and word vectors)
• torchtext.datasets: Pre-built loaders for common NLP datasets

Installation

Make sure you have Python 2.7 or 3.5+ and PyTorch 0.4.0 or newer. You can then install torchtext using pip:

pip install torchtext

For PyTorch versions before 0.4.0, please use pip install torchtext==0.2.3.

Optional requirements

If you want to use English tokenizer from SpaCy, you need to install SpaCy and download its English model:

pip install spacy
python -m spacy download en

Alternatively, you might want to use the Moses tokenizer port in SacreMoses (split from NLTK). You have to install SacreMoses:

pip install sacremoses

Documentation

Find the documentation here.

Data

The data module provides the following:

• Ability to describe declaratively how to load a custom NLP dataset that's in a "normal" format:

  >>> pos = data.TabularDataset(
  ...    path='data/pos/pos_wsj_train.tsv', format='tsv',
  ...    fields=[('text', data.Field()),
  ...            ('labels', data.Field())])
  ...
  >>> sentiment = data.TabularDataset(
  ...    path='data/sentiment/train.json', format='json',
  ...    fields={'sentence_tokenized': ('text', data.Field(sequential=True)),
  ...            'sentiment_gold': ('labels', data.Field(sequential=False))})

• Ability to define a preprocessing pipeline:

  >>> src = data.Field(tokenize=my_custom_tokenizer)
  >>> trg = data.Field(tokenize=my_custom_tokenizer)
  >>> mt_train = datasets.TranslationDataset(
  ...     path='data/mt/wmt16-ende.train', exts=('.en', '.de'),
  ...     fields=(src, trg))

• Batching, padding, and numericalizing (including building a vocabulary object):

  >>> # continuing from above
  >>> mt_dev = datasets.TranslationDataset(
  ...     path='data/mt/newstest2014', exts=('.en', '.de'),
  ...     fields=(src, trg))
  >>> src.build_vocab(mt_train, max_size=80000)
  >>> trg.build_vocab(mt_train, max_size=40000)
  >>> # mt_dev shares the fields, so it shares their vocab objects
  >>>
  >>> train_iter = data.BucketIterator(
  ...     dataset=mt_train, batch_size=32,
  ...     sort_key=lambda x: data.interleave_keys(len(x.src), len(x.trg)))
  >>> # usage
  >>> next(iter(train_iter))
  <data.Batch(batch_size=32, src=[LongTensor (32, 25)], trg=[LongTensor (32, 28)])>

• Wrapper for dataset splits (train, validation, test):

  >>> TEXT = data.Field()
  >>> LABELS = data.Field()
  >>>
  >>> train, val, test = data.TabularDataset.splits(
  ...     path='/data/pos_wsj/pos_wsj', train='_train.tsv',
  ...     validation='_dev.tsv', test='_test.tsv', format='tsv',
  ...     fields=[('text', TEXT), ('labels', LABELS)])
  >>>
  >>> train_iter, val_iter, test_iter = data.BucketIterator.splits(
  ...     (train, val, test), batch_sizes=(16, 256, 256),
  >>>     sort_key=lambda x: len(x.text), device=0)
  >>>
  >>> TEXT.build_vocab(train)
  >>> LABELS.build_vocab(train)

Datasets

The datasets module currently contains:

• Sentiment analysis: SST and IMDb
• Question classification: TREC
• Entailment: SNLI, MultiNLI
• Language modeling: abstract class + WikiText-2, WikiText103, PennTreebank
• Machine translation: abstract class + Multi30k, IWSLT, WMT14
• Sequence tagging (e.g. POS/NER): abstract class + UDPOS, CoNLL2000Chunking
• Question answering: 20 QA bAbI tasks
• Text classification: AG_NEWS, SogouNews, DBpedia, YelpReviewPolarity, YelpReviewFull, YahooAnswers, AmazonReviewPolarity, AmazonReviewFull

Others are planned or a work in progress:

• Question answering: SQuAD

See the test directory for examples of dataset usage.

Disclaimer on Datasets

This is a utility library that downloads and prepares public datasets. We do not host or distribute these datasets, vouch for their quality or fairness, or claim that you have license to use the dataset. It is your responsibility to determine whether you have permission to use the dataset under the dataset's license.

If you're a dataset owner and wish to update any part of it (description, citation, etc.), or do not want your dataset to be included in this library, please get in touch through a GitHub issue. Thanks for your contribution to the ML community!