Changelog¶

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning:

[0.2.1] - 2020/11/26¶

The rpu_config is now pretty-printed in a readable manner (excluding the default settings and other readability tweak). (#60)
Added a new ReferenceUnitCell which has two devices, where one is fixed and the other updated and the effective weight is computed a difference between the two. (#61)
VectorUnitCell accepts now arbitrary weighting schemes that can be user-defined by using a new gamma_vec property that specifies how to combine the unit cell devices to form the effective weight. (#61)

The unit cell items in aihwkit.simulator.configs have been renamed, removing their Device suffix, for having a more consistent naming scheme. (#57)
The Exceptions raised by the library have been revised, making use in some cases of the ones introduced in a new aihwkit.exceptions module. (#49)
Some VectorUnitCell properties have been renamed and extended with an update policy specifying how to select the hidden devices. (#61)
The pybind11 version required has been bumped to 2.6.0, which can be installed from pip and makes system-wide installation no longer required. Please update your pybind11 accordingly for compiling the library. (#44)

The BackwardIOParameters specialization has been removed, as bound management is now automatically ignored for the backward pass. Please use the more general IOParameters instead. (#45)

Serialization of Modules that contain children analog layers is now possible, both when using containers such as Sequential and when using analog layers as custom Module attributes. (#74, #80)
The build system has been improved, with experimental Windows support and supporting using CUDA 11 correctly. (#58, #67, #68)

Added more types of resistive devices: IdealResistiveDevice, LinearStep, SoftBounds, ExpStep, VectorUnitCell, TransferCompoundDevice, DifferenceUnitCell. (#14)
Added a new InferenceTile that supports basic hardware-aware training and inference using a statistical noise model that was fitted by real PCM devices. (#25)
Added a new AnalogSequential layer that can be used in place of Sequential for easier operation on children analog layers. (#34)

Specifying the tile configuration (resistive device and the rest of the properties) is now based on a new RPUConfig family of classes, that is passed as a rpu_config argument instead of resistive_device to Tiles and Layers. Please check the aihwkit.simulator.config module for more details. (#23)
The different analog tiles are now organized into a aihwkit.simulator.tiles package. The internal IndexedTiles have been removed, and the rest of previous top-level imports have been kept. (#29)

Improved package compatibility when using non-UTF8 encodings (version file, package description). (#13)
The build system can now detect and use openblas directly when using the conda-installable version. (#22)
When using analog layers as children of another module, the tiles are now correctly moved to CUDA if using AnalogSequential (or by the optimizer if using regular torch container modules). (#34)