Engines

Pty-Chi supports multiple algorithms, or engines, for ptychography reconstruction. The table below compares their merits and limitations.

Engine	LSQML	PIE (incl. ePIE, rPIE)	Difference map	Bilinear Hessian	Autodiff
Minibatching allowed	Yes	Yes	No	Yes	Yes
GPU support	Multiple	Single	Single	Single	Multiple
Memory usage	Moderate	Moderate	High	Moderate	Low
Mixed-state probe support	Yes	Yes	Yes	Yes	Yes
OPR support	Yes	Yes	No	No	Yes
Multislice support	Yes	Yes	No	No	Yes