reduction-chain-rule: Reduction chain-rule hooks (dict-in / dict-out)

In CVXR: Disciplined Convex Optimization

Reduction chain-rule hooks (dict-in / dict-out)

Description

Walk the solving chain during Problem$backward() / Problem$derivative(). Each hook takes and returns a named list keyed by as.character(leaf@id) whose values are shaped arrays (the leaf's dim). The base Reduction methods are identity pass-throughs.

Usage

var_backward(x, del_vars)

var_forward(x, dvars)

param_backward(x, dparams)

param_forward(x, param_deltas)

Arguments

x	A Reduction.
del_vars	Named list ⁠var-id -> gradient array⁠ (outer representation).
dvars	Named list ⁠var-id -> delta array⁠ (inner representation).
dparams	Named list ⁠param-id -> gradient array⁠ (inner representation).
param_deltas	Named list ⁠param-id -> delta array⁠ (outer representation).

Value

For var_backward: the same map in the inner (reduced) representation.

For var_forward: the same map in the outer (original) representation.

For param_backward: the same map in the outer (original) representation.

For param_forward: the same map in the inner (transformed) representation.

CVXR documentation built on Aug. 24, 2026, 9:10 a.m.