Module bootstrap_backend 

Pillar: III. PACR field: Γ.

Pluggable bootstrap backend abstraction for ε-machine confidence intervals.

Design

BootstrapBackend is a zero-cost trait that decouples the CSSR inference pipeline from the specific resampling engine. Today only CpuBootstrap is active. On genesis_node (M1 Ultra) a [MetalBootstrap] stub compiles in; the stub delegates to CpuBootstrap until the Metal compute pipeline is implemented in ets-probe-ffi.

Contract

resample_and_estimate(data, b) returns a Vec<f64> of length 2 × b laid out as [c_0, h_0, c_1, h_1, …, c_{b-1}, h_{b-1}] where c_i is the C_μ estimate and h_i is the h_μ estimate for bootstrap replicate i.

This flat layout avoids heap-allocating b tuples and maps naturally to SIMD-friendly memory access patterns for future Metal kernels.

Structs

CpuBootstrap

CPU-based parametric bootstrap (the existing B=200 implementation).

Traits

BootstrapBackend

Pluggable backend for parametric bootstrap resampling of ε-machine metrics.