v0.2.4

What's Changed

• Reduced memory and debugged reverse AD by @cgiovanetti in #22

Three major fixes:

• Reduced memory usage dramatically.
• Added reverse AD option (adjoint option at initialization) and checkpointing. Use RecursiveAdjointCheckpoint in adjoint input to Model at initialization for this option.
• Fixed double jnp.where bug leading to NaNs in gradients.

Full Changelog: v0.2.3...v0.2.4