scvi.nn.Decoder#

class scvi.nn.Decoder(n_input, n_output, n_cat_list=None, n_layers=1, n_hidden=128, **kwargs)[source]#

Bases: torch.nn.modules.module.Module

Decodes data from latent space to data space.

n_input dimensions to n_output dimensions using a fully-connected neural network of n_hidden layers. Output is the mean and variance of a multivariate Gaussian

Parameters
n_input : int

The dimensionality of the input (latent space)

n_output : int

The dimensionality of the output (data space)

n_cat_list : Iterable[int] | NoneOptional[Iterable[int]] (default: None)

A list containing the number of categories for each category of interest. Each category will be included using a one-hot encoding

n_layers : int (default: 1)

The number of fully-connected hidden layers

n_hidden : int (default: 128)

The number of nodes per hidden layer

dropout_rate

Dropout rate to apply to each of the hidden layers

kwargs

Keyword args for FCLayers

Attributes table#

Methods table#

forward(x, *cat_list)

The forward computation for a single sample.

Attributes#

T_destination#

Decoder.T_destination#

alias of TypeVar(‘T_destination’, bound=Mapping[str, torch.Tensor])

alias of TypeVar(‘T_destination’, bound=Mapping[str, torch.Tensor]) .. autoattribute:: Decoder.T_destination dump_patches ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Decoder.dump_patches: bool = False#

This allows better BC support for load_state_dict(). In state_dict(), the version number will be saved as in the attribute _metadata of the returned state dict, and thus pickled. _metadata is a dictionary with keys that follow the naming convention of state dict. See _load_from_state_dict on how to use this information in loading.

If new parameters/buffers are added/removed from a module, this number shall be bumped, and the module’s _load_from_state_dict method can compare the version number and do appropriate changes if the state dict is from before the change.

training#

Decoder.training: bool#

Methods#

forward#

Decoder.forward(x, *cat_list)[source]#

The forward computation for a single sample.

  1. Decodes the data from the latent space using the decoder network

  2. Returns tensors for the mean and variance of a multivariate distribution

Parameters
x : Tensor

tensor with shape (n_input,)

cat_list : int

list of category membership(s) for this sample

Returns

2-tuple of torch.Tensor Mean and variance tensors of shape (n_output,)