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>) -> 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.

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.