aihwkit.nn.modules.linear_mapped module

Analog mapped linear layer.

class aihwkit.nn.modules.linear_mapped.AnalogLinearMapped(in_features, out_features, bias=True, rpu_config=None, tile_module_class=<class 'aihwkit.simulator.tiles.array.TileModuleArray'>)[source]

Bases: AnalogLinear

Linear layer that uses one or several analog tiles.

Linear layer that uses an analog tile during its forward, backward and update passes. In contrast to Linear the maximal in and/or out dimension can be restricted, in which case the linear layer is split into multiple parts and computed on multiple tiles of given max sizes.

In contrast to Linear, the bias vector (if requested) is always handled in digital (floating point).

Internally the TileModuleArray is used for the logical tiling process.

Note

Mapping is controlled by the MappingParameter.

Note

The tensor parameters of this layer (.weight and .bias) are not guaranteed to contain the same values as the internal weights and biases stored in the analog tile. Please use set_weights and get_weights when attempting to read or modify the weight/bias.

Parameters:

  • in_features (int) – input vector size (number of columns).

  • out_features (int) – output vector size (number of rows).

  • rpu_config (MappableRPU | None) – resistive processing unit configuration.

  • bias (bool) – whether to use a bias row on the analog tile or not

  • tile_module_class (Type | None) –

classmethod from_digital(module, rpu_config, tile_module_class=<class 'aihwkit.simulator.tiles.array.TileModuleArray'>)[source]

Return an AnalogLinear layer from a torch Linear layer.

Parameters:

  • module (Linear) – The torch module to convert. All layers that are defined in the conversion_map.

  • rpu_config (RPUConfigBase) – RPU config to apply to all converted tiles. Applied to all converted tiles.

  • tile_module_class (Type | None) – Class of the underlying TileModule. If not given, will select based on the MappingParameter setting either TileModuleBase or TileModuleArray

Returns:

an AnalogLinear layer based on the digital Linear module.

Raises:

ConfigError – In case the RPUConfig is not of type MappableRPU

Return type:

AnalogLinear