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Using Albumentations with Tensorflow

Author: Ayushman Buragohain

!pip install -q -U albumentations
!echo "$(pip freeze | grep albumentations) is successfully installed"

albumentations==0.4.6 is successfully installed
  • We'll we using an example from tensorflow_datasets.
! pip install --upgrade tensorflow_datasets

Run the example

# necessary imports
import tensorflow as tf
import numpy as np
import matplotlib.pyplot as plt
import tensorflow_datasets as tfds
from functools import partial
from albumentations import (
    Compose, RandomBrightness, JpegCompression, HueSaturationValue, RandomContrast, HorizontalFlip,
    Rotate
)
AUTOTUNE = tf.data.experimental.AUTOTUNE

tfds.__version__

'3.2.1'

# load in the tf_flowers dataset
data, info= tfds.load(name="tf_flowers", split="train", as_supervised=True, with_info=True)
data

<PrefetchDataset shapes: ((None, None, 3), ()), types: (tf.uint8, tf.int64)>

info

tfds.core.DatasetInfo(
    name='tf_flowers',
    version=3.0.1,
    description='A large set of images of flowers',
    homepage='https://www.tensorflow.org/tutorials/load_data/images',
    features=FeaturesDict({
        'image': Image(shape=(None, None, 3), dtype=tf.uint8),
        'label': ClassLabel(shape=(), dtype=tf.int64, num_classes=5),
    }),
    total_num_examples=3670,
    splits={
        'train': 3670,
    },
    supervised_keys=('image', 'label'),
    citation="""@ONLINE {tfflowers,
    author = "The TensorFlow Team",
    title = "Flowers",
    month = "jan",
    year = "2019",
    url = "http://download.tensorflow.org/example_images/flower_photos.tgz" }""",
    redistribution_info=,
)

An Example Pipeline Using tf.image

Process Data

def process_image(image, label, img_size):
    # cast and normalize image
    image = tf.image.convert_image_dtype(image, tf.float32)
    # apply simple augmentations
    image = tf.image.random_flip_left_right(image)
    image = tf.image.resize(image,[img_size, img_size])
    return image, label

ds_tf = data.map(partial(process_image, img_size=120), num_parallel_calls=AUTOTUNE).batch(30).prefetch(AUTOTUNE)
ds_tf

<PrefetchDataset shapes: ((None, 120, 120, 3), (None,)), types: (tf.float32, tf.int64)>

View images from the dataset

def view_image(ds):
    image, label = next(iter(ds)) # extract 1 batch from the dataset
    image = image.numpy()
    label = label.numpy()

    fig = plt.figure(figsize=(22, 22))
    for i in range(20):
        ax = fig.add_subplot(4, 5, i+1, xticks=[], yticks=[])
        ax.imshow(image[i])
        ax.set_title(f"Label: {label[i]}")

view_image(ds_tf)