open-jev-deberta-v3-large

open-jev-deberta-v3-large

An open, Jev-shaped typed-decision model. One program state and any number of typed questions (choice over up to 255 options / score over 2–10 ordered levels / noul yes-no) go in; a calibrated probability distribution per question comes back from one forward pass. Nothing is generated, so the structured-output error rate is 0 by construction.

This is an independent reproduction of the shape of TypeSafe AI's Jev ("System One Model"); it is not affiliated with TypeSafe, uses none of their data or code, and its numbers are not comparable to theirs (they report agreement with frontier models on private workflows; this model is measured on public gold labels). Code, corpus builder, ablations and the full measured record: kotoba-lang/typed-decisions and the ADRs it cites.

Use

# pip install torch transformers safetensors huggingface_hub sentencepiece protobuf
import sys; sys.path.insert(0, "<path to this repo snapshot>")   # or: pip install git+https://github.com/kotoba-lang/typed-decisions
from typed_decisions.open_jev import OpenJev

m = OpenJev.from_pretrained("com-kotobalabs/open-jev-deberta-v3-large")
m.decide(
    "I was charged twice for the same order and nobody answers my emails. I want my money back now.",
    [{"type": "choice", "instructions": "Which product area is the message about?",
      "options": ["fees & charges", "pin & security", "refund & dispute", "top-up", "exchange & fiat", "atm & cash", "transfer", "card", "account & identity", "other"]},
     {"type": "score",  "instructions": "How positive is the sentiment of this message?",
      "options": ["very negative", "negative", "neutral", "positive", "very positive"]},
     {"type": "noul",   "instructions": "The customer is asking for a refund."}])
# [{'choice': 'fees & charges', 'probabilities': {...}, 'confidence': 0.733},
#  {'score': 0.846, 'probabilities': {...}, 'confidence': 0.527},
#  {'noul': 0.892}]

score is the expected level index (may fall between levels); noul is p(yes). Every answer carries the full distribution. Context: 512 tokens total (state is cut to 256 tokens). CPU fp32 on an M1 Max: 1.8 s for 4 questions; H100 bf16: 28 ms end-to-end for 10 questions on one state (25 ms forward), 518 questions/s at batch 8.

How it works

[CLS] [STATE] state [Q] instructions [OPT] option_1 [OPT] option_2 … [Q] … [SEP]

A DeBERTa-v3-large encoder reads state and all questions at once. For each option the head scores [mean(question tokens); mean(option tokens); product]; a softmax within each question's option group is that question's distribution. The three marker tokens are added to the tokenizer; head.safetensors holds the 3-layer scoring head; open_jev_config.json holds the pooling mode, the post-hoc temperature (fitted on a validation split) and the training provenance. Loss was cross-entropy + Brier; training used gold-preserving question augmentation (option shuffling, paraphrase templates, distractor dropping, level relabelling, noul negation with flipped gold) at p = 0.7.

Training data

Public gold labels only — no synthetic answers, no teacher model:

18,000 train states / 42,000 questions, 1 epoch, seed 2, one H100 (229 s, ≈ $0.25).

Measured (test: 1,500 states / 3,508 questions; OOD: 4,012 never-seen questions on the same states)

Three seeds of this configuration: in-domain 0.847 ± 0.005, OOD 0.678 ± 0.012. Larger context-free sweeps, the head ablation (a fresh marker-token head does not learn; the span head does), the comparison against ModernBERT-base/large and against a LoRA-tuned LLaDA-MoE-7B-A1B (0.835 in-domain at 16× the latency), and the code-decision variant (which definition does this one reference, 0.63 on held-out namespaces, chance 0.18) are in the repository README.

Limitations

• It reads the question only partly. In-domain 0.85 vs OOD 0.69 is the honest gap; unseen ordered scales are the weakest (score on new level sets is barely above majority).
• English only; 512-token context; three public domains (banking support, movie reviews, Wikipedia yes/no). Anything else is out of distribution and should be measured before use.
• Confidence is the max probability after temperature scaling on the validation split (in-domain ECE 0.022); on OOD questions it is over-confident by ~0.03 mean and should be re-calibrated on your data.
• It cannot generate text or arguments; it chooses among the options you give it.

Provenance

Built in the kotoba-lang workspace with the recipe and measurements recorded in ADR-2609181544 / ADR-2609181715 (superproject com-junkawasaki/root). Base model microsoft/deberta-v3-large (MIT). Datasets: banking77 (CC-BY-4.0), SST-5, BoolQ (CC-BY-SA-3.0).