ยป Keras API reference / KerasCV / Layers / Preprocessing layers / RandomAugmentationPipeline layer

RandomAugmentationPipeline layer

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RandomAugmentationPipeline class

keras_cv.layers.RandomAugmentationPipeline(
    layers, augmentations_per_image, rate=1.0, auto_vectorize=False, seed=None, **kwargs
)

RandomAugmentationPipeline constructs a pipeline based on provided arguments.

The implemented policy does the following: for each inputs provided in call(), the policy first inputs a random number, if the number is < rate, the policy then selects a random layer from the provided list of layers. It then calls the layer() on the inputs. This is done augmentations_per_image times.

This layer can be used to create custom policies resembling RandAugment or AutoAugment.

Usage:

# construct a list of layers
layers = keras_cv.layers.RandAugment.get_standard_policy(
    value_range=(0, 255), magnitude=0.75, magnitude_stddev=0.3
)
layers = layers[:4]  # slice out some layers you don't want for whatever reason
layers = layers + [keras_cv.layers.GridMask()]

# create the pipeline.
pipeline = keras_cv.layers.RandomAugmentationPipeline(
    layers=layers, augmentations_per_image=3
)

augmented_images = pipeline(images)

Arguments

  • layers: a list of keras.Layers. These are randomly inputs during augmentation to augment the inputs passed in call(). The layers passed should subclass BaseImageAugmentationLayer. Passing layers=[] would result in a no-op.
  • augmentations_per_image: the number of layers to apply to each inputs in the call() method.
  • rate: the rate at which to apply each augmentation. This is applied on a per augmentation bases, so if augmentations_per_image=3 and rate=0.5, the odds an image will receive no augmentations is 0.5^3, or 0.50.50.5.
  • auto_vectorize: whether to use tf.vectorized_map or tf.map_fn to apply the augmentations. This offers a significant performance boost, but can only be used if all the layers provided to the layers argument support auto vectorization.
  • seed: Integer. Used to create a random seed.