Create interfaces between reconstruction methods and libertem

[heidemeissner]

For EPIE (DESY-version and Alpaka-version) an interface between C++ and python is required.

Start with Achim's EPIE which is written in python to have an easy full workflow.

[uellue]

Minimal example:

• Stand-alone Python script
• Minimal Alpaka routine ("hello world" style, for example a sum to check correctness)
• Interfacing between Python and Alpaka, for example via cython, ctypes etc
• Two Python functions:
  • init() to set up data structures
  • Repeated calls to process() that moves data into the structures, triggers the Alpaka processing and receives the result

[sk1p]

See also: https://cppyy.readthedocs.io/en/latest/ for a cling-based approach to create a Python<>C++ binding

[SimeonEhrig]

A first version of a python interface is merged in the desy ePIE code and an improved version is WIP.