Module laplace.curvature.backpack

Classes

class BackPackInterface (model: nn.Module, likelihood: Likelihood | str, last_layer: bool = False, subnetwork_indices: torch.LongTensor | None = None, dict_key_x: str = 'input_ids', dict_key_y: str = 'labels')

Interface for Backpack backend.

Ancestors

Subclasses

Methods

def jacobians(self, x: torch.Tensor | MutableMapping[str, torch.Tensor | Any], enable_backprop: bool = False) ‑> tuple[torch.Tensor, torch.Tensor]

Compute Jacobians \nabla_{\theta} f(x;\theta) at current parameter \theta using backpack's BatchGrad per output dimension. Note that BackPACK doesn't play well with torch.func, so this method has to be overridden.

Parameters

x : torch.Tensor
input data (batch, input_shape) on compatible device with model.
enable_backprop : bool, default = False
whether to enable backprop through the Js and f w.r.t. x

Returns

Js : torch.Tensor
Jacobians (batch, parameters, outputs)
f : torch.Tensor
output function (batch, outputs)
def gradients(self, x: torch.Tensor | MutableMapping[str, torch.Tensor | Any], y: torch.Tensor) ‑> tuple[torch.Tensor, torch.Tensor]

Compute gradients \nabla_\theta \ell(f(x;\theta, y) at current parameter \theta using Backpack's BatchGrad. Note that BackPACK doesn't play well with torch.func, so this method has to be overridden.

Parameters

x : torch.Tensor
input data (batch, input_shape) on compatible device with model.
y : torch.Tensor
 

Returns

Gs : torch.Tensor
gradients (batch, parameters)
loss : torch.Tensor
 

Inherited members

class BackPackGGN (model: nn.Module, likelihood: Likelihood | str, last_layer: bool = False, subnetwork_indices: torch.LongTensor | None = None, dict_key_x: str = 'input_ids', dict_key_y: str = 'labels', stochastic: bool = False)

Implementation of the GGNInterface using Backpack.

Ancestors

Inherited members

class BackPackEF (model: nn.Module, likelihood: Likelihood | str, last_layer: bool = False, subnetwork_indices: torch.LongTensor | None = None, dict_key_x: str = 'input_ids', dict_key_y: str = 'labels')

Implementation of EFInterface using Backpack.

Ancestors

Inherited members