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DEEPCHECKS GLOSSARY

ImageDataGenerator

The amount of available data frequently improves the productivity of DL neural networks.

  • Data augmentation is a method of artificially creating fresh train data from existing data. This is accomplished by using domain-specific approaches to transform instances from training data into new and unique training examples.

The most well-known sort of data augmentation is picture data augmentation, which entails transforming pictures in the training data into altered copies. Zooms, flips, shifts, and other operations from the area of picture editing are included in transforms. The goal is to add additional, believable instances to the training collection. This refers to changes in the training data set pictures that the model is likely to observe. As a result, it is evident that the precise data augmentation techniques utilized for training data must be carefully chosen, taking into account the training dataset as well as an understanding of the issue area. In addition, a small domestic data, system, and training run may be used to test data augmentation strategies alone and together to evaluate if they lead to a noticeable improvement in model performance. Modern DL algorithms (CNN), can learn characteristics that are independent of where they appear in the picture. However, augmentation can help with this transform invariant method to learning by assisting the model in learning characteristics that are also transform invariant. Typically, image data augmentation is only used on the training dataset, not the test datasets. Data preparation, such as picture resizing and pixel scaling, differs in that it must be done uniformly throughout all data that interface with the model.

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ImageDataGenerator and image augmentation

When training a model, the Keras deep learning package allows you to employ data augmentation automatically. The ImageDataGenerator class is used to do this. First, the class must be constructed, and the kinds of data augmentation must be configured using parameters sent to the main approach. A variety of approaches, as well as image scaling methods, are supported. The dataset’s photos aren’t directly used. Instead, the model is only given enhanced pictures. So because augmentations are done at random, it is possible to produce and employ changed pictures as well as near imitations of the actual pictures during training. The validation, as well as the test data, can both be specified using a data generator. A second ImageDataGenerator instance is frequently used, which may have the same pixel scaling setup as the ImageDataGenerator example utilized for the learning data, but does not require data augmentation. It is because augmentation is used only to increase the training dataset artificially in terms of improving model performance on an unenhanced dataset.

Data augmentation techniques

  • Horizontal and vertical flip– In the instance of a horizontal or vertical flip, an image flip entails inverting the columns and rows of pixels.

A boolean horizontal flip or the vertical flip option to the ImageDataGenerator main approach specifies the flip augmentation.

  • Random brightness– Randomly darkening photos, lightening images, or both can be used to boost the brightness of an image.

The goal is for a model to adapt across photos that have been trained at various illumination conditions. This may be accomplished by using the brightness range option to the ImageDataGenerator constructor, which provides the min and max range as a float indicating a % for determining the amount of brightening. Numbers just under 1.0 dim the picture, whereas values more than 1.0 lighten it, while 1.0 has no impact.

  • Random rotation– A rotation augmentation spins the picture clockwise by a specified number of degrees between 0 and 360 at random.

The rotation will most probably spin photons out of the captured image, leaving blank spaces in the frame which must be patched in.

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