Class Poisson

java.lang.Object
org.tensorflow.framework.losses.Poisson
All Implemented Interfaces:
Loss
public class Poisson extends Object
Computes the Poisson loss between labels and predictions.

loss = predictions - labels * log(predictions)

Standalone usage: 

   Operand<TFloat32> labels =
       tf.constant(new float[][] {{0.f, 1.f}, {0.f, 0.f}});
   Operand<TFloat32> predictions =
       tf.constant(new float[][] {{1.f, 1.f}, {0.f, 0.f}});
   Poisson poissonLoss = new Poisson(tf);
   Operand<TFloat32> result = poissonLoss.call(Ops tf, labels, predictions);
   // produces 0.5f

Calling with sample weight: 

   Operand<TFloat32> sampleWeight = tf.constant(new float[] {0.8f, 0.2f});
   Operand<TFloat32> result = poissonLoss.call(Ops tf, labels, predictions, sampleWeight);
   // produces 0.4f

Using SUM reduction type: 

   Poisson poissonLoss = new Poisson(Reduction.SUM);
   Operand<TFloat32> result = poissonLoss.call(Ops tf, labels, predictions);
   // produces 0.999f

Using NONE reduction type: 

   Poisson poissonLoss = new Poisson(Reduction.NONE);
   Operand<TFloat32> result = poissonLoss.call(Ops tf, labels, predictions);
   // produces [0.999f, 0f]

  • Field Details

    • REDUCTION_DEFAULT

      public static final Reduction REDUCTION_DEFAULT

    • reduction

      protected final Reduction reduction

  • Constructor Details

    • Poisson

      public Poisson()
      Creates a Poisson AbstractLoss using Class.getSimpleName() as the loss name and a AbstractLoss Reduction of AbstractLoss.REDUCTION_DEFAULT

    • Poisson

      public Poisson(String name)
      Creates a Poisson AbstractLoss using a AbstractLoss Reduction of AbstractLoss.REDUCTION_DEFAULT
      Parameters:
      name - the name of the loss, if null then Class.getSimpleName() is used.

    • Poisson

      public Poisson(Reduction reduction)
      Creates a Poisson AbstractLoss using Class.getSimpleName() as the loss name
      Parameters:
      reduction - Type of Reduction to apply to the loss.

    • Poisson

      public Poisson(String name, Reduction reduction)
      Creates a Poisson AbstractLoss
      Parameters:
      name - the name of the loss, if null then Class.getSimpleName() is used.
      reduction - Type of Reduction to apply to the loss.

  • Method Details

    • call

      public <T extends TNumber> Operand<T> call(Ops tf, Operand<? extends TNumber> labels, Operand<T> predictions, Operand<T> sampleWeights)
      Generates an Operand that calculates the loss.
      Type Parameters:
      T - The data type of the predictions, sampleWeights and loss.
      Parameters:
      tf - the TensorFlow Ops
      labels - the truth values or labels
      predictions - the predictions
      sampleWeights - Optional sampleWeights acts as a coefficient for the loss. If a scalar is provided, then the loss is simply scaled by the given value. If SampleWeights is a tensor of size [batch_size], then the total loss for each sample of the batch is rescaled by the corresponding element in the SampleWeights vector. If the shape of SampleWeights is [batch_size, d0, .. dN-1] (or can be broadcast to this shape), then each loss element of predictions is scaled by the corresponding value of SampleWeights. (Note on dN-1: all loss functions reduce by 1 dimension, usually axis=-1.)
      Returns:
      the loss

    • call

      public <T extends TNumber> Operand<T> call(Ops tf, Operand<? extends TNumber> labels, Operand<T> predictions)
      Calculates the loss
      Type Parameters:
      T - The data type of the predictions and loss.
      Parameters:
      tf - the TensorFlow Ops
      labels - the truth values or labels
      predictions - the predictions
      Returns:
      the loss

    • getReduction

      public Reduction getReduction()
      Gets the loss reduction
      Returns:
      the loss reduction

    • getName

      public String getName()
      Gets the name for this loss
      Returns:
      the name for this loss