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Data augmentation is a key technology in the field of artificial intelligence and machine learning. It involves creating variations on existing datasets to improve model performance and generalization. Python is a popular AI and ML language that provides several powerful data augmentation libraries. In this article, we will introduce ten Python libraries for data augmentation and provide code snippets and explanations for each library.
##Augmentor is a general-purpose Python library for image enhancement. It allows you to easily apply a range of operations to your images, such as rotation, flipping, and color manipulation. Here is a simple example of how to use Augmentor for image enhancement:
import Augmentor p = Augmentor.Pipeline("path/to/your/images") p.rotate(probability=0.7, max_left_rotatinotallow=25, max_right_rotatinotallow=25) p.flip_left_right(probability=0.5) p.sample(100)
Albumentations Master supports various enhancement features such as random rotation , flip and brightness adjustment. He is one of my most commonly used enhancement libraries
import albumentations as A transform = A.Compose([A.RandomRotate90(),A.HorizontalFlip(),A.RandomBrightnessContrast(), ]) augmented_image = transform(image=image)["image"]
import imgaug.augmenters as iaa augmenter = iaa.Sequential([iaa.Fliplr(0.5),iaa.Sometimes(0.5, iaa.GaussianBlur(sigma=(0, 2.0))),iaa.ContrastNormalization((0.5, 2.0)), ]) augmented_image = augmenter.augment_image(image)
import nlpaug.augmenter.word as naw aug = naw.ContextualWordEmbsAug(model_path='bert-base-uncased', actinotallow="insert") augmented_text = aug.augment("This is a sample text.")
from imgaug import augmenters as iaa seq = iaa.Sequential([iaa.Fliplr(0.5),iaa.Sometimes(0.5, iaa.GaussianBlur(sigma=(0, 2.0))),iaa.ContrastNormalization((0.5, 2.0)), ]) augmented_image = seq(image=image)
from textattack.augmentation import WordNetAugmenter augmenter = WordNetAugmenter() augmented_text = augmenter.augment("The quick brown fox")TAAE
from taae import SynonymAugmenter augmenter = SynonymAugmenter() augmented_text = augmenter.augment("This is a test sentence.")Audiomentations
import audiomentations as A augmenter = A.Compose([A.PitchShift(),A.TimeStretch(),A.AddBackgroundNoise(), ]) augmented_audio = augmenter(samples=audio_data, sample_rate=sample_rate)
ImageDataAugmentor
from ImageDataAugmentor.image_data_augmentor import * import tensorflow as tf datagen = ImageDataAugmentor(augment=augmentor,preprocess_input=None, ) train_generator = datagen.flow_from_directory("data/train", batch_size=32, class_mode="binary")
Keras ImageDataGenerator
from tensorflow.keras.preprocessing.image import ImageDataGenerator datagen = ImageDataGenerator(rotation_range=40,width_shift_range=0.2,height_shift_range=0.2,shear_range=0.2,zoom_range=0.2,horizontal_flip=True,fill_mode="nearest", ) augmented_images = datagen.flow_from_directory("data/train", batch_size=32)
Summary
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