Elamur Groupantstranslation-meta-fwt
The groupant beside tools/translate/src/fwt.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial | approximant |
| ast | partial | syntax.json |
| composition | partial | composition |
| cost | symbolic source derived | invariant |
| descriptant | present | descriptant |
| invariant | partial | invariant |
| tests | bounded native receipts | tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
behavior_complement | behavior_complement | partial source derived model | behavior_complement |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
thresholds | thresholds | partial source derived model | thresholds |
effect_order | effect_order | partial source derived model | effect_order |
insert_head | insert_head | partial source derived model | insert_head |
contiguous_scope | contiguous_scope | partial source derived model | contiguous_scope |
Parts
Model text
descriptant
Description and epoch memory
Training counts LCS gaps and function-only insertion/drop contexts; apply substitutes concepts then computes drops/inserts against substituted sequence. Remap kept heads and inserted attachment. JoinTable rewrites joining feature; ReorderTable moves contiguous root-dependent spans and renumbers.
Prospective epoch 2026-10-31
Models predicted metadata loss, bounded coordinate transport and deterministic tie selection before test changes. Production bytes are preserved; only five inline synthetic tests were appended across the group.
Observation epoch 2026-10-31
Selected named native tests are bound in tests.md; raw receipts are external under $MOVA_DATA/runs/octopus-wave32-tr_meta-2026-10-31. Syntax is generated twice and byte-compared. This is partial syntax without macro expansion or semantic resolution.
Gaps
No real annotator/model loads, corpus translation, teacher calls, GPU, full training/evaluation, or language-accuracy claim. No executable percentage surrogate is supplied: an appropriate reference metric/domain is not established. Supported future caps are1/2/5/10 percent only. Residual reconstruction is conditional on retained diagnostics and is not persistent learning.
approximant
Forward relation
Training counts LCS gaps and function-only insertion/drop contexts; apply substitutes concepts then computes drops/inserts against substituted sequence. Remap kept heads and inserted attachment. JoinTable rewrites joining feature; ReorderTable moves contiguous root-dependent spans and renumbers.
invariant
Invariant and cost
Domain and preservation
Valid0..n heads; bounded counts; learned maps finite. Insertion strings use last slash tag or default IN. Corpus fitting remains unexecuted; selected transform tests only.
Cost
Fw apply worst O(n²+I*n) head/neighbor searches plus map/strings; Join O(bytes+ n log J). Reorder repeated subtree fixed points and Vec retain/insert bounded O(n³) conservative; train LCS plus O(n²) uniqueness counts per verse.
Counters and allocation arithmetic must remain representable. String/map costs include compared bytes; finite evidence is not a throughput estimate.
composition
Local composition
The child isolates the translation-meta-fwt-function_apply relation inside this source. Its observation is a projection of the complete file relation described in approximant.md; costs overlap and must not be added twice. The remaining code supplies context/table inputs and consumes outputs. External joins: meta MTok feeds profile, Hebrew encoder, fwt and rules; meta LCS feeds logic and alignment-based training; Strong labels optionally override IBM ownership. No runtime chain between all children is asserted.
models
Typed models
Subject: exact source hash in manifest; observation is one call or the stated finite training pass. All models are partial source-derived relations, not universal proof. Domain and resource assumptions are in invariant.md. The baseline exclusion is an inner source-derived claim on that domain; reverse is a compatible-antecedent relation. Specialized relations hold fixed the parameters and tables unless stated otherwise. Evidence uses the named checks in tests.md; individual assertions cover only finite parts, other branches remain prospective.
behavior_complement
Drop contexts cannot delete nonfunction tokens. Substitution changes only concept before decisions. Join mapping cannot change spans/heads/tags.
reverse_reconstruction
Output admits removed tokens/heads and pre-substitution concepts; maps are generally noninjective. Reorder with a known unique permutation has inverse head renumbering, but output alone does not identify the selected moves.
thresholds
Drop/insert require3 and half; substitutions5 and .3 occurrence while target<=.05 source.
effect_order
subs first then all context keys; applying drops sequentially would be a different map.
insert_head
Inserted tokens attach next kept source token, else previous, else root.
contiguous_scope
Reorder skips noncontiguous subtrees and updates every kept head via final permutation.
tests
Checks and evidence
- fwt::tests::a_fronted_part_moves_after_its_root
- fwt::tests::drops_and_inserts
Exact cargo commands use package translate, binary translate, --offline --locked and -- --exact --test-threads=1. External native-commands.json lists every name; debug and release run twice, numerical status and named outcomes retained. Some tests target other portions of the file; this fragment has source reasoning plus only the overlapping assertions.
Compiled controls mutate production decision expressions and restore exact original bytes; see external mutations.json and restoration receipt. No assertion-only mutation is counted. The evidence summary is authoritative for completed receipts. Scoped source reasoning and finite tests do not establish total branch coverage.
Recorded 2026-10-31 result
This source contributes 2 exact named checks to the 18-check group. Every name passes twice in debug and twice in release, with identical sorted outcomes. A compiled production mutation in fwt.rs was rejected by its selected runtime assertion; its original and restored SHA-256 match. All 18 checks pass again after all nine restorations. There were nine rejected production mutations, zero assertion-only mutations and zero surviving controls in this batch. Nine source projections matched byte-for-byte across two generations. No original production bytes changed.
The augmented-registry check has no owned source or fragment diagnostic. Only root-owned inference-core/mova child/source bindings await integration. A first isolated-registry experiment was unsuitable because the checker inspects unrelated existing sidecars; those failures are retained separately and are not counted as semantic controls.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/tools/translate/src/fwt.rs.groupant/