solprop.backends.numpy_ref

The NumPy reference backend: the oracle.

Plain NumPy and scipy.fft through solprop.fourier, one named function per pass, no fusion, no in-place tricks and no compiled code. It exists to be read and to be right: every other backend is validated against the numbers it produces (docs/dev/backends.md section 2). It propagates a mode-averaged or multimode problem on either grid with the Kerr, Raman and plasma terms, using interaction-picture DOPRI5 with the cumulative operator, the lagged PI controller, landing on save planes and hard kinks, the shot-noise field and the hard band mask.

solprop.backends.numpy_ref.passes holds the passes; solprop.backends.numpy_ref.backend holds the step loop and the seam; construct is the registry’s constructor (solprop.backends.registry).

Modules

backend	The reference backend: the step loop, the seam and the refusals.
batch	Evaluate reference Runge-Kutta stage arrays across a leading member axis.
envelope_plasma	Evaluate compiled envelope plasma as separate current-source streams.
general_modal	The general modal guide's nonlinear source, on the reference backend.
multistep	The reference's interaction-picture Adams march (SEP 13, SEP 14).
passes	The passes of one interaction-picture stage, one function each.
populations	The reference's scan of the field synthesised on the axis (SEP 19).
tdse	Assemble independently projected TDSE polarisation and current sources.