torch_concepts.nn.SelectorZU

class SelectorZU(in_features: int, memory_size: int, exogenous_size: int, out_features: int, temperature: float = 1.0, *args, **kwargs)

Memory-based selector for concept exogenous with attention mechanism.

This module maintains a learnable memory bank of exogenous and uses an attention mechanism to select relevant exogenous based on input. It supports both soft (weighted) and hard (Gumbel-softmax) selection.

temperature

Temperature for softmax/Gumbel-softmax.

Type:

float

memory_size

Number of memory slots per concept.

Type:

int

exogenous_size

Dimension of each memory exogenous.

Type:

int

memory

Learnable memory bank.

Type:

nn.Embedding

selector

Attention network for memory selection.

Type:

nn.Sequential

Parameters:

• in_features – Number of input latent features.

• memory_size – Number of memory slots per concept.

• exogenous_size – Dimension of each memory exogenous.

• out_features – Number of output concepts.

• temperature – Temperature parameter for selection (default: 1.0).

• *args – Additional arguments for the linear layer.

• **kwargs – Additional keyword arguments for the linear layer.

Example

>>> import torch
>>> from torch_concepts.nn import SelectorZU
>>>
>>> # Create memory selector
>>> selector = SelectorZU(
...     in_features=64,
...     memory_size=10,
...     exogenous_size=32,
...     out_features=5,
...     temperature=0.5
... )
>>>
>>> # Forward pass with soft selection
>>> latent = torch.randn(4, 64)  # batch_size=4
>>> selected = selector(latent, sampling=False)
>>> print(selected.shape)
torch.Size([4, 5, 32])
>>>
>>> # Forward pass with hard selection (Gumbel-softmax)
>>> selected_hard = selector(latent, sampling=True)
>>> print(selected_hard.shape)
torch.Size([4, 5, 32])

References

Debot et al. “Interpretable Concept-Based Memory Reasoning”, NeurIPS 2024. https://arxiv.org/abs/2407.15527

__init__(in_features: int, memory_size: int, exogenous_size: int, out_features: int, temperature: float = 1.0, *args, **kwargs)

Initialize the memory selector.

Parameters:

• in_features – Number of input latent features.

• memory_size – Number of memory slots per concept.

• exogenous_size – Dimension of each memory exogenous.

• out_features – Number of output concepts.

• temperature – Temperature for selection (default: 1.0).

• *args – Additional arguments for the linear layer.

• **kwargs – Additional keyword arguments for the linear layer.

Methods

__init__(in_features, memory_size, ...[, ...])	Initialize the memory selector.
add_module(name, module)	Add a child module to the current module.
apply(fn)	Apply fn recursively to every submodule (as returned by .children()) as well as self.
bfloat16()	Casts all floating point parameters and buffers to bfloat16 datatype.
buffers([recurse])	Return an iterator over module buffers.
children()	Return an iterator over immediate children modules.
compile(*args, **kwargs)	Compile this Module's forward using torch.compile().
cpu()	Move all model parameters and buffers to the CPU.
cuda([device])	Move all model parameters and buffers to the GPU.
double()	Casts all floating point parameters and buffers to double datatype.
eval()	Set the module in evaluation mode.
extra_repr()	Return the extra representation of the module.
float()	Casts all floating point parameters and buffers to float datatype.
forward([input, sampling])	Select memory exogenous based on input input.
get_buffer(target)	Return the buffer given by target if it exists, otherwise throw an error.
get_extra_state()	Return any extra state to include in the module's state_dict.
get_parameter(target)	Return the parameter given by target if it exists, otherwise throw an error.
get_submodule(target)	Return the submodule given by target if it exists, otherwise throw an error.
half()	Casts all floating point parameters and buffers to half datatype.
ipu([device])	Move all model parameters and buffers to the IPU.
load_state_dict(state_dict[, strict, assign])	Copy parameters and buffers from state_dict into this module and its descendants.
modules()	Return an iterator over all modules in the network.
mtia([device])	Move all model parameters and buffers to the MTIA.
named_buffers([prefix, recurse, ...])	Return an iterator over module buffers, yielding both the name of the buffer as well as the buffer itself.
named_children()	Return an iterator over immediate children modules, yielding both the name of the module as well as the module itself.
named_modules([memo, prefix, remove_duplicate])	Return an iterator over all modules in the network, yielding both the name of the module as well as the module itself.
named_parameters([prefix, recurse, ...])	Return an iterator over module parameters, yielding both the name of the parameter as well as the parameter itself.
parameters([recurse])	Return an iterator over module parameters.
register_backward_hook(hook)	Register a backward hook on the module.
register_buffer(name, tensor[, persistent])	Add a buffer to the module.
register_forward_hook(hook, *[, prepend, ...])	Register a forward hook on the module.
register_forward_pre_hook(hook, *[, ...])	Register a forward pre-hook on the module.
register_full_backward_hook(hook[, prepend])	Register a backward hook on the module.
register_full_backward_pre_hook(hook[, prepend])	Register a backward pre-hook on the module.
register_load_state_dict_post_hook(hook)	Register a post-hook to be run after module's load_state_dict() is called.
register_load_state_dict_pre_hook(hook)	Register a pre-hook to be run before module's load_state_dict() is called.
register_module(name, module)	Alias for add_module().
register_parameter(name, param)	Add a parameter to the module.
register_state_dict_post_hook(hook)	Register a post-hook for the state_dict() method.
register_state_dict_pre_hook(hook)	Register a pre-hook for the state_dict() method.
requires_grad_([requires_grad])	Change if autograd should record operations on parameters in this module.
set_extra_state(state)	Set extra state contained in the loaded state_dict.
set_submodule(target, module[, strict])	Set the submodule given by target if it exists, otherwise throw an error.
share_memory()	See torch.Tensor.share_memory_().
state_dict(*args[, destination, prefix, ...])	Return a dictionary containing references to the whole state of the module.
to(*args, **kwargs)	Move and/or cast the parameters and buffers.
to_empty(*, device[, recurse])	Move the parameters and buffers to the specified device without copying storage.
train([mode])	Set the module in training mode.
type(dst_type)	Casts all parameters and buffers to dst_type.
xpu([device])	Move all model parameters and buffers to the XPU.
zero_grad([set_to_none])	Reset gradients of all model parameters.

Attributes

T_destination
call_super_init
dump_patches
training