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TensorFlow 1 version View source on GitHub

Class PReLU

Parametric Rectified Linear Unit.

Inherits From: Layer


  • Class tf.compat.v1.keras.layers.PReLU
  • Class tf.compat.v2.keras.layers.PReLU

It follows:

f(x) = alpha * x for x < 0, f(x) = x for x >= 0, where alpha is a learned array with the same shape as x.

Input shape:

Arbitrary. Use the keyword argument input_shape (tuple of integers, does not include the samples axis) when using this layer as the first layer in a model.

Output shape:

Same shape as the input.


  • alpha_initializer: Initializer function for the weights.
  • alpha_regularizer: Regularizer for the weights.
  • alpha_constraint: Constraint for the weights.
  • shared_axes: The axes along which to share learnable parameters for the activation function. For example, if the incoming feature maps are from a 2D convolution with output shape (batch, height, width, channels), and you wish to share parameters across space so that each filter only has one set of parameters, set shared_axes=[1, 2].


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