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What are the steps to convert a tensorflow PrefetchDataset into a format that can be used with ImageDataGenerator to perform data augmentation?

asked 2022-12-11 11:00:00 +0000

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answered 2021-05-10 19:00:00 +0000

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The steps to convert a TensorFlow PrefetchDataset into a format that can be used with ImageDataGenerator to perform data augmentation are:

  1. Load the dataset using TensorFlow's tf.data module:
dataset = tf.data.Dataset.from_tensor_slices((x_train, y_train))
  1. Split the dataset into training and validation sets:
train_dataset = dataset.take(train_size).shuffle(buffer_size=train_size).batch(batch_size).prefetch(buffer_size=-1)
val_dataset = dataset.skip(train_size).shuffle(buffer_size=val_size).batch(batch_size).prefetch(buffer_size=-1)
  1. Create an instance of the ImageDataGenerator class and define the desired data augmentation techniques:
data_generator = ImageDataGenerator(
    rotation_range=15,
    width_shift_range=0.1,
    height_shift_range=0.1,
    shear_range=0.1,
    zoom_range=0.1,
    horizontal_flip=True,
    rescale=1./255
)
  1. Use the flow_from_dataset method of the ImageDataGenerator instance to convert the training and validation datasets into a format that can be used for data augmentation:
train_generator = data_generator.flow_from_dataset(
    train_dataset,
    target_size=(img_height, img_width),
    batch_size=batch_size,
    class_mode='categorical'
)
val_generator = data_generator.flow_from_dataset(
    val_dataset,
    target_size=(img_height, img_width),
    batch_size=batch_size,
    class_mode='categorical'
)
  1. Train the model using the data generators instead of the original datasets:
model.fit(train_generator, epochs=num_epochs, validation_data=val_generator)

Note: The specific arguments passed to the ImageDataGenerator and flowfromdataset methods may differ depending on the specific requirements of the project.

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Asked: 2022-12-11 11:00:00 +0000

Seen: 9 times

Last updated: May 10 '21