adept-augmentations 0.1

A Python library aimed at adeptly, augmenting NLP training data.

Adept Augmentations

Welcome to Adept Augmentations, can be used for creating additional data in Few Shot Named Entity Recognition (NER) setting!

Adept Augmentation is a Python package that provides data augmentation functionalities for NER training data using the spacy and datasets packages. Currently, we support one augmentor EntitySwapAugmenter, however, we plan on adding some more.

EntitySwapAugmenter takes either a datasets.Dataset or a spacy.tokens.DocBin. Additionally, it is optional to provide a set of labels to be included in the augmentations. It initially created a knowledge base of entities belonging to a certain label. When running augmenter.augment() for N runs, it then creates N new sentences with random swaps of the original entities with an entity of the same corresponding label from the knowledge base.

For example, assuming that we have knowledge base for PERSONS and LOCATIONS and PRODUCTS. We can then create additional data for the sentence "Momofuko Ando created instant noodles in Osaka." using augmenter.augment(N=2), resulting in "David created instant noodles in Madrid." or "Tom created Adept Augmentations in the Netherlands".

Adept Augmentation works for NER labels using the IOB, IOB2, BIOES and BILUO tagging schemes, as well as labels not following any tagging scheme.

Usage

Datasets

from datasets import load_dataset

from adept_augmentations import EntitySwapAugmenter

dataset = load_dataset("conll2003", split="train[:3]")
augmenter = EntitySwapAugmenter(dataset)
aug_dataset = augmenter.augment(N=4)

for entry in aug_dataset["tokens"]:
    print(entry)

# ['EU', 'rejects', 'British', 'call', 'to', 'boycott', 'British', 'lamb', '.']
# ['EU', 'rejects', 'German', 'call', 'to', 'boycott', 'German', 'lamb', '.']
# ['EU', 'rejects', 'German', 'call', 'to', 'boycott', 'British', 'lamb', '.']
# ['Peter', 'Blackburn']
# ['BRUSSELS', '1996-08-22']

spaCy

import spacy
from spacy.tokens import DocBin

from adept_augmentations import EntitySwapAugmenter

nlp = spacy.load("en_core_web_sm")

# Create some example training data
TRAIN_DATA = [
    "Apple is looking at buying U.K. startup for $1 billion",
    "Microsoft acquires GitHub for $7.5 billion",
]
docs = nlp.pipe(TRAIN_DATA)

# Create a new DocBin
doc_bin = DocBin(docs=docs)

doc_bin = EntitySwapAugmenter(doc_bin).augment(4)
for doc in doc_bin.get_docs(nlp.vocab):
    print(doc.text)

# GitHub is looking at buying U.K. startup for $ 7.5 billion
# Microsoft is looking at buying U.K. startup for $ 1 billion
# Microsoft is looking at buying U.K. startup for $ 7.5 billion
# GitHub is looking at buying U.K. startup for $ 1 billion
# Microsoft acquires Apple for $ 7.5 billion
# Apple acquires Microsoft for $ 1 billion
# Microsoft acquires Microsoft for $ 7.5 billion
# GitHub acquires GitHub for $ 1 billion

Potential performance gains

Data augmentation can significantly improve model performance in low-data scenarios. To showcase this, we trained a SpanMarker NER model on the 50, 100, 200, 400 and 800 first CoNLL03 training samples.

The augmented dataset is generated like so:

# Select N (50, 100, 200, 400 or 800) samples from the gold training dataset
train_dataset = dataset["train"].select(range(N))

# Generate augmented dataset, with 4 * N samples
augmented_dataset = Augmenter(train_dataset).augment(N=4)

# Combine the original with the augmented to produce the full dataset
# to produce a dataset 5 times as big as the original
train_dataset = concatenate_datasets([augmented_dataset, train_dataset])

Note that the baseline uses 5 epochs. This way, the training time and steps are identical between the two experiments. All scenarios are executed 5 times, and we report means and standard errors.

	Original - 5 Epochs	Augmented - 1 Epoch
N=50	0.387 ± 0.042 F1	0.484 ± 0.054 F1
N=100	0.585 ± 0.070 F1	0.663 ± 0.038 F1
N=200	0.717 ± 0.053 F1	0.757 ± 0.025 F1
N=400	0.816 ± 0.017 F1	0.826 ± 0.011 F1
N=800	0.859 ± 0.004 F1	0.862 ± 0.002 F1

(Note: These results are not optimized and do not indicate maximum performances with SpanMarker.)

From these results, it is clear that performing data augmentation using adept_augmentations can heavily improve performance in low-data settings.

Implemented Augmenters

• EntitySwapAugmenter
• KnowledgeBaseSwapAugmenter
• CoreferenceSwapAugmenter
• SyntaticTreeSwapAugmenter

Potential integrations

Potentially, we can look into integrations of other augmentations packages that do not preserve gold standard knowledge. Good sources for inspiration are:

• https://github.com/KennethEnevoldsen/augmenty
  • https://kennethenevoldsen.github.io/augmenty/tutorials/introduction.html
• https://github.com/QData/TextAttack
• https://github.com/infinitylogesh/mutate