Struct HessianProgram 

pub struct HessianProgram { /* private fields */ }

Precompiled Hessian-of-one-tape program. Built once via HessianProgram::compile; executed many times.

Implementations

impl HessianProgram

pub fn compile( tape: &Tape, hess_map: &HashMap<(usize, usize), usize>, ) -> Option<Self>

Build the program. The hess_map is the same (row, col) -> values-index map that Tape::hessian_accumulate uses; the compiler inlines each lookup into a HessEmit op.

Returns None when tape contains an opcode the program path cannot lower (see [program_supports_op]). A caller must fall back to the Tape (build_with_externals) interpreter path for those tapes — this is a graceful signal, not a panic, so a problem built from arbitrary user .nl input can never crash the process here (code review L28).

pub fn n_slots(&self) -> usize

pub fn n_ops(&self) -> usize

pub fn execute( &self, x: &[f64], weight: f64, scratch: &mut [f64], values: &mut [f64], )

Execute the program. scratch is overwritten throughout; it must be at least [n_slots] long. values is the shared Hessian-values buffer the caller is accumulating into (same semantics as Tape::hessian_accumulate’s values).

Trait Implementations

impl Clone for HessianProgram

fn clone(&self) -> HessianProgram

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HessianProgram

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.