Augmenter that apply TF-IDF based to textual input.

class nlpaug.augmenter.word.tfidf.TfIdfAug(model_path='.', action='substitute', name='TfIdf_Aug', aug_min=1, aug_max=10, aug_p=0.3, top_k=5, stopwords=None, tokenizer=None, reverse_tokenizer=None, stopwords_regex=None, verbose=0)[source]

Bases: nlpaug.augmenter.word.word_augmenter.WordAugmenter

Augmenter that leverage TF-IDF statistics to insert or substitute word.

  • model_path (str) – Downloaded model directory. Either model_path or model is must be provided
  • action (str) – Either ‘insert or ‘substitute’. If value is ‘insert’, a new word will be injected to random position according to TF-IDF calculation. If value is ‘substitute’, word will be replaced according to TF-IDF calculation
  • top_k (int) – Controlling lucky draw pool. Top k score token will be used for augmentation. Larger k, more token can be used. Default value is 5. If value is None which means using all possible tokens.
  • aug_p (float) – Percentage of word will be augmented.
  • aug_min (int) – Minimum number of word will be augmented.
  • aug_max (int) – Maximum number of word will be augmented. If None is passed, number of augmentation is calculated via aup_p. If calculated result from aug_p is smaller than aug_max, will use calculated result from aug_p. Otherwise, using aug_max.
  • stopwords (list) – List of words which will be skipped from augment operation.
  • stopwords_regex (str) – Regular expression for matching words which will be skipped from augment operation.
  • tokenizer (func) – Customize tokenization process
  • reverse_tokenizer (func) – Customize reverse of tokenization process
  • name (str) – Name of this augmenter
>>> import nlpaug.augmenter.word as naw
>>> aug = naw.TfIdfAug(model_path='.')
augment(data, n=1, num_thread=1)
  • data (object/list) – Data for augmentation. It can be list of data (e.g. list of string or numpy) or single element (e.g. string or numpy)
  • n (int) – Default is 1. Number of unique augmented output. Will be force to 1 if input is list of data
  • num_thread (int) – Number of thread for data augmentation. Use this option when you are using CPU and n is larger than 1

Augmented data

>>> augmented_data = aug.augment(data)