Elamur Groupantstranslation-meta-fwt-function_apply
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 |
| 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 |
substitution_context | substitution_context | partial source derived model | substitution_context |
synthetic_span | synthetic_span | partial source derived model | synthetic_span |
head_climb | head_climb | partial source derived model | head_climb |
boundary_insert | boundary_insert | partial source derived model | boundary_insert |
Model text
descriptant
Description and epoch memory
Clone/substitute, mark function drops, emit insertion runs before source i then kept i, build new_of, climb dropped heads and attach inserted tokens to nearest directional kept neighbor.
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
Clone/substitute, mark function drops, emit insertion runs before source i then kept i, build new_of, climb dropped heads and attach inserted tokens to nearest directional kept neighbor.
invariant
Invariant and cost
Domain and preservation
In-range heads, finite strings; malformed insertion tag defaults IN; cycles through dropped nodes stop after n+1 checks.
Cost
O(nĀ²+I*n) worst-case, plus lookup/key/output byte work; O(n+I) coordinates.
Counters and allocation arithmetic must remain representable. String/map costs include compared bytes; finite evidence is not a throughput estimate.
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
A content token cannot be dropped by drops set alone. Deleted positions are never returned as output head indices.
reverse_reconstruction
For fixed table, compatible originals include dropped chains leading to each output head and substitutions mapping into emitted concepts; spans of inserts are always(0,0).
substitution_context
Keys observe substituted neighbors, not originals.
synthetic_span
Inserted MTok carries span(0,0), relation Det even default IN tag.
head_climb
Kept token heads follow removed ancestors until kept/root; bounded cycles root.
boundary_insert
Loop includes i=n, enabling suffix inserts and empty-sequence key ^|$.
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.
This page in Markdown ā https://md.groupants.elamur.ai/free/en/mova/tools/translate/src/fwt.rs.groupant/function_apply.groupant/