ti-runtime

Neutral Taichi runtime for MechDSL (PlanJune14, PJ-0).

This package is the seam + primitive layer of the "Seams & Bodies" architecture:

MechDSL owns the seams + primitives (this package); algo2code generates the bodies (solvers, preconditioners, constitutive updates, time integrators) from LaTeX, injected into these seams.

It contains only stable infrastructure — nothing algorithmic is hardcoded here:

Module	Contents
`vector_ops`	`@ti.kernel` vector primitives: `copy / axpy / xpay / scal / zero / dot / norm2`
`tensor_ti`	Tier-1 `@ti.func` helpers: `det3 / inv3 / F→C→E→J / Voigt / deviatoric / von_mises`
`seams`	injection plumbing: `Operator`, `PreconditionerBase`/`Identity`/`Diagonal`, `Solver`, `LinearSolveContext`
`fields`	`ti.init` + field-allocation boilerplate
`hex8`	Hex8 shape functions, natural-coord gradients, 2×2×2 Gauss quadrature (test harness / element operators)

Provenance & invariants

One-time harvest (PlanJune14 D-B) — adapted from NumerixWeave (libs/tisolvers, libs/ticonstit, apps/tifem); no ongoing sync.
Portable output (D-D) — generated artifacts depend on ti_runtime, never on mechdsl, so they can later feed NumerixWeave / MOOSE / MFEM.
Conventions follow MechDSL dev/design_docs/07-CONVENTIONS.md: Voigt order [xx, yy, zz, xy, xz, yz], tensorial (unscaled shears), metric diag(1,1,1,2,2,2).

Operator / solver contract

A matrix-free operator is an in-place callable apply(out, x) -> None computing out = A @ x over Taichi fields. Inject it and run a (generated) solver against it:

ctx = LinearSolveContext()
ctx.set_operator(my_tangent_matvec)        # out = K(u) @ x, matrix-free @ti.kernel
ctx.set_preconditioner(DiagonalPreconditioner(diag))
# a generated PCG body calls ctx.apply_A / ctx.apply_preconditioner + vector_ops

Development Status
- 3 - Alpha
Intended Audience
- Science/Research
License
- OSI Approved :: MIT License
Programming Language
- Python :: 3
- Python :: 3.12

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