IBM Analog Hardware Acceleration Kit 0.2.1

Added

• 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)

Changed

• 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)

Removed

• 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)

Fixed

• 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)