Implement the cacheing option for the CCA response function

[physmlee]

Related Code

• feature/CCAResponse branch > /processors/DataGenerator4D/SpatialSampler/SpatialSampler.py

Motivation

• The time bottleneck of the current CCA response function is in building the 2-dimensional ($\theta_{\text{start}}$-$r_{\text{start}}$ space) PDF and the application of the trapping efficiency to that 2D PDF.
  • The default configuration takes ~10 min to build the 2D PDF. Sampling the variables doesn't take a second.
• What if we can save and load the prebuilt 2D PDF? That will speed up the processor a lot!

Things to Implement

• I/O functionality of the SpatialSampler.
  • It should save the configuration, the 2D PDF, and other stuff.
• Make SpatialSampler to be initializable from the saved SpatialSampler file.
• Optional: a cache look-up method.
  • Compare the cached SpatialSamplers with the provided configuration. If a perfectly matched cache is found, then load it and skip the 2D PDF building process.