textflint.generation_layer.transformation.UT.ocr

OcrAugTransformation that apply ocr error simulation to textual input.

class textflint.generation_layer.transformation.UT.ocr.Ocr(min_char=1, trans_min=1, trans_max=10, trans_p=0.2, stop_words=None, **kwargs)[source]

Bases: textflint.generation_layer.transformation.word_substitute.WordSubstitute

Transformation that simulate ocr error by random values.

__init__(min_char=1, trans_min=1, trans_max=10, trans_p=0.2, stop_words=None, **kwargs)[source]
Parameters

min_char (int) – If word less than this value, do not draw word for

augmentation :param int trans_min: Minimum number of character will be augmented. :param int trans_max: Maximum number of character will be augmented.

If None is passed, number of augmentation is calculated via aup_char_p. If calculated result from aug_p is smaller than aug_max, will use calculated result from aup_char_p. Otherwise, using aug_max.

Parameters

  • trans_p (float) – Percentage of character (per token) will be augmented.

  • stop_words (list) – List of words which will be skipped from augment operation.

class textflint.generation_layer.transformation.UT.ocr.WordSubstitute(trans_min=1, trans_max=10, trans_p=0.1, stop_words=None, **kwargs)[source]

Bases: textflint.generation_layer.transformation.transformation.Transformation

Word replace transformation to implement normal word replace functions.

__init__(trans_min=1, trans_max=10, trans_p=0.1, stop_words=None, **kwargs)[source]
Parameters

  • trans_min (int) – Minimum number of word will be augmented.

  • trans_max (int) – Maximum number of word will be augmented. If None is passed, number of augmentation is calculated via aup_char_p. If calculated result from aug_p is smaller than aug_max, will use calculated result from aup_char_p. Otherwise, using aug_max.

  • trans_p (float) – Percentage of word will be augmented.

  • stop_words (list) – List of words which will be skipped from augment operation.

  • processor (EnProcessor) –

  • get_pos (bool) – whether pass pos tag to _get_substitute_words API.

abstract skip_aug(tokens, mask, pos=None)[source]

Returns the index of the replaced tokens.

Parameters

tokens (list) – tokenized words or word with pos tag pairs

Return list

the index of the replaced tokens

is_stop_words(token)[source]

Judge whether the input word belongs to the stop words vocab.

Parameters

token (str) – the input word to be judged

Return bool

is a stop word or not

pre_skip_aug(tokens, mask)[source]

Skip the tokens in stop words list or punctuation list.

Parameters

  • tokens (list) – the list of tokens

  • mask (list) – the list of mask Indicates whether each word is allowed to be substituted. ORIGIN is allowed, while TASK_MASK and MODIFIED_MASK is not.

Return list

List of possible substituted token index.

get_trans_cnt(size)[source]

Get the num of words/chars transformation.

Parameters

size (int) – the size of target sentence

Return int

number of words to apply transformation.