Struct PoissonNllLoss 

pub struct PoissonNllLoss {
    pub log_input: bool,
    pub full: bool,
    pub eps: f64,
}

Negative Log Likelihood (NLL) loss with a Poisson distribution assumption for the target.

This loss function is used when the target values are assumed to follow a Poisson distribution. The loss is defined as:

target ~ Poisson(input)
L(predictions, target) = predictions - target * log(predictions) + log(target!)

The last term (log(target!)) can be omitted or approximated using Stirling’s formula. The approximation is applied for target > 1, while for target <= 1, zeros are added to the loss.

For more details, see: https://en.wikipedia.org/wiki/Poisson_regression#Maximum_likelihood-based_parameter_estimation

Fields

log_input: bool

If true, the predictions are expected to be in log-space.

full: bool

Whether to compute the full loss, including the Stirling approximation term.

eps: f64

A small value to avoid evaluation of log(0) when log_input is false.

Implementations

impl PoissonNllLoss

pub fn forward<const D: usize>( &self, predictions: Tensor<D>, targets: Tensor<D>, reduction: Reduction, ) -> Tensor<1>

Computes the loss element-wise for the given predictions and targets, then reduces the result to a single loss value.

Arguments

• predictions: The predicted values.
• targets: The target values.
• reduction: The reduction method to apply. Reduction::Auto behaves as Reduction::Mean.

Shapes

• predictions: [...dims]
• targets: [...dims]
• output: [1]

Panics

• Panics if the shapes of predictions and targets do not match.
• Panics if any target value is negative.
• Panics if log_input is false and any prediction value is negative.

pub fn forward_no_reduction<const D: usize>( &self, predictions: Tensor<D>, targets: Tensor<D>, ) -> Tensor<D>

Computes the loss element-wise for the given predictions and targets without reduction.

Arguments

• predictions: The predicted values.
• targets: The target values.

Shapes

• predictions: [...dims]
• targets: [...dims]
• output: [...dims]

Panics

• Panics if the shapes of predictions and targets do not match.
• Panics if any target value is negative.
• Panics if log_input is false and any prediction value is negative.

Trait Implementations

impl Clone for PoissonNllLoss

fn clone(&self) -> PoissonNllLoss

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PoissonNllLoss

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Display for PoissonNllLoss

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Module for PoissonNllLoss

fn visit<V>(&self, _visitor: &mut V)

where V: ModuleVisitor,

Visit each parameter and module-owned control value with a visitor.

fn map<M>(self, _mapper: &mut M) -> PoissonNllLoss

where M: ModuleMapper,

Map each parameter and module-owned control value with a mapper.

fn to_device(self, _: &Device) -> PoissonNllLoss

Move the module and all of its sub-modules to the given device.

fn fork(self, _: &Device) -> PoissonNllLoss

Fork the module and all of its sub-modules to the given device.

fn collect_devices(&self, devices: Vec<Device>) -> Vec<Device>

Return all the devices found in the underneath module tree added to the given vector without duplicates.

fn materialize(self) -> PoissonNllLoss

Fold parameter reparameterizations into their effective values and remove them.

fn valid(&self) -> PoissonNllLoss

Returns a validation snapshot without autodiff or active training flags.

fn train(self) -> PoissonNllLoss

Enables autodiff and restores configured training state throughout the module.

fn devices(&self) -> Vec<Device>

Return all the devices found in the underneath module tree without duplicates.

fn set_require_grad(self, require_grad: bool) -> Self

Set whether every floating-point tensor parameter in the module tree requires gradients.

fn set_require_grad_group(self, group: ParamGroup, require_grad: bool) -> Self

Set whether matched floating-point tensor parameters require gradients.

fn no_grad(self) -> Self

Disable gradients for every floating-point tensor parameter in the module tree.

fn freeze(self) -> Self

Freeze the whole module tree.

fn unfreeze(self) -> Self

Unfreeze the whole module tree.

fn freeze_group(self, group: ParamGroup) -> Self

Freeze every module-owned value in the given group, leaving the rest of the module untouched.

fn unfreeze_group(self, group: ParamGroup) -> Self

Unfreeze every module-owned value in the given group, leaving the rest of the module untouched.

fn num_params(&self) -> usize

Get the number of parameters the module has, including all of its sub-modules, without initializing the ones not initialized yet.

fn quantize_weights(self, quantizer: &mut Quantizer) -> Self

Quantize the weights of the module.

fn quantize_weights_group( self, quantizer: &mut Quantizer, group: ParamGroup, ) -> Self

Quantize the weights of the given parameter group.

fn apply_reparameterization<R>(self, reparameterizer: R) -> Self

where Self: Sized, R: Reparameterizer,

Attach reparameterizations using the given Reparameterizer.

fn apply_lora(self, lora: Lora) -> Self

where Self: Sized,

Attach LoRA adapters to the module’s 2-D weights, freezing all base tensor parameters.

fn apply_qlora(self, qlora: QLora) -> Self

where Self: Sized,

Apply QLoRA to the module: quantize the (frozen) base tensor parameters and attach trainable LoRA adapters to 2-D weights.

fn into_record(self) -> ModuleRecord

where Self: Sized,

Collect this module’s tensor parameters into a ModuleRecord.

fn into_record_group(self, group: ParamGroup) -> ModuleRecord

where Self: Sized,

Collect the tensor parameters group names into a ModuleRecord.

fn try_load_record(self, record: ModuleRecord) -> Result<Self, RecordError>

where Self: Sized,

Apply a ModuleRecord to this module, returning the loaded module.

fn load_record(self, record: ModuleRecord) -> Self

where Self: Sized,

Apply a ModuleRecord to this module, consuming and returning it.

fn save_file<P>(self, path: P) -> Result<(), RecordError>

where P: AsRef<Path>, Self: Sized,

Save this module’s parameters to a burnpack file on disk.

fn load_file<P>(self, path: P) -> Self

where P: AsRef<Path>, Self: Sized,

Load this module’s parameters from a burnpack file on disk, returning the loaded module.

fn try_load_file<P>(self, path: P) -> Result<Self, RecordError>

where P: AsRef<Path>, Self: Sized,

Fallible variant of load_file.

impl ModuleDisplay for PoissonNllLoss

fn custom_settings(&self) -> Option<DisplaySettings>

Custom display settings for the module.

fn custom_content(&self, content: Content) -> Option<Content>

Custom attributes for the module.

fn format(&self, passed_settings: DisplaySettings) -> String

Formats the module with provided display settings.

impl ModuleDisplayDefault for PoissonNllLoss

fn content(&self, content: Content) -> Option<Content>

Attributes of the module used for display purposes.

fn num_params(&self) -> usize

Gets the number of the parameters of the module.