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cis2-conformance

All digests below are SHA-256, lowercase hex. These are the pinned values a conforming clean-room implementation of docs/CIS2_SPEC_v0.3b.md (current) MUST reproduce bit-for-bit. No timing numbers are recorded anywhere in this repository by policy. Historical v0.2 digests are kept below for reference.

Primary normative test vector (§13.1, spec v0.3b): SmolLM2-135M, `gen_toks=16`

Model: HuggingFaceTB/SmolLM2-135M, prompt "Once upon a time", 16 greedy-decoded tokens, fp32 compute. Only table_digest and CIS2_REF changed from v0.2 (RoPE range-reduction fix, see CHANGELOG.md v0.3/v0.3b); inv_freq_table_digest, argmax_digest, and generated_token_ids are unchanged from v0.1/v0.2.

weights_sha256          = 80521b40281d6ce74e35c9282c22539e75aa0ac8578892b2a59955ef78d55da1
config_sha256            = 1d556eab73b69c7f11f64c557a2f9c6f440bd4c6b89bb2584a6b498c92603843
tokenizer_sha256          = 9ca9acddb6525a194ec8ac7a87f24fbba7232a9a15ffa1af0c1224fcd888e47c
table_digest              = 23c7bfaf5cef0095fd021af2eb1808abb4928bae4219756d86bdac670a06b35d
inv_freq_table_digest     = da9f6dcfde0425588815509e874515cdcd3d6b8818b6d0136590052e7bbf6f12
argmax_digest             = 0b9c8f3ac90d0b9cd5f1719ac327dca1fc639fd87468305fccebbe3d56f67aff
generated_token_ids       = 28,665,436,253,1838,8180,3365,14176,30,2306,4161,281,253,2066,2291,351

CIS2_REF (witness digest) = d82743059d1db929e710236fe4ec37f89e6f932524801345a006980f7c3cc9df

This is the value scripts/self_check.sh builds verify3/ and compares against.

Historical: spec v0.2 primary test vector (superseded)

Model: HuggingFaceTB/SmolLM2-135M, prompt "Once upon a time", 16 greedy-decoded tokens, fp32 compute.

weights_sha256        = 80521b40281d6ce74e35c9282c22539e75aa0ac8578892b2a59955ef78d55da1
config_sha256          = 1d556eab73b69c7f11f64c557a2f9c6f440bd4c6b89bb2584a6b498c92603843
tokenizer_sha256        = 9ca9acddb6525a194ec8ac7a87f24fbba7232a9a15ffa1af0c1224fcd888e47c
table_digest            = 465d358ccd63721256dbd2abbc77ad5de755adf3230635f95b12b1727dfa1ea3
inv_freq_table_digest   = da9f6dcfde0425588815509e874515cdcd3d6b8818b6d0136590052e7bbf6f12
argmax_digest           = 0b9c8f3ac90d0b9cd5f1719ac327dca1fc639fd87468305fccebbe3d56f67aff
generated_token_ids     = 28,665,436,253,1838,8180,3365,14176,30,2306,4161,281,253,2066,2291,351

CIS2_REF (witness digest) = a0c563ef804f50413b7fb6619ae4afe9b51b1ffa7655e944221393e85d6261da

Superseded by the v0.3b vector above; scripts/self_check.sh now targets v0.3b's CIS2_REF.

Note: the informative 128-token, Qwen2.5-0.5B, and scale/horizon vectors below were generated and confirmed against spec v0.2 only; they have not been re-run against v0.3b as part of this port.

GPU confirmation of the §13.1 normative vector

The CIS2_REF value above was reproduced bit-for-bit by an independent CUDA implementation on an NVIDIA Tesla P100 (sm_60) on 2026-09-08, alongside a byte-identical per-step trace. Full result, scope limits and provenance: docs/GPU_RESULT.md. One further informative vector was pinned by that run — the same model and prompt at a longer horizon:

SmolLM2-135M, "Once upon a time", gen_toks=128, spec v0.3b
CIS2_REF = 22f69ad87a615d66a77efaca8b1172d22bdfb4bd5092ceffd302e35669a050f6

Two further digests from that run belong to a candidate pinned-tree reduction order that is not part of v0.3b and is not normative; they are recorded in docs/GPU_RESULT.md only.

Informative: 128-token prompt set (SmolLM2-135M, spec v0.2)

Five prompts of varying length, gen_toks=128 each, confirmed identical between x86_64 and aarch64 CI runners. These are informative cross-ISA evidence, not §13.1 normative test vectors.

prompt_idx	prompt_toks	`CIS2_REF` digest (`gen_toks=128`)
0	4	`e8d4f83fe623c329e2a56acb0efb0aa11614eda168e009ffcd014da110d5ac7d`
1	11	`e805baec6a932ff74d933ff0b51df045a75603f5409536a5325e46ab5a7ccc05`
2	11	`cf1ef40e0fda59fc72218e8f7daa9935e3f15083a1d92c4cde9729d8b015b803`
3	19	`ee1247798e49f766adf10b64fb9cce07ee9cf80a34394e5e38c47485939c6c01`
4	215	`135f50b5850e9e7bf31ee4fd9b935a002c7627cce6e1b7260e665e726c2c450b`

Informative: SmolLM2-360M (second-model-scale evidence, same family/tokenizer)

Not a §13.1 test vector (that role belongs to SmolLM2-135M above); exercises the reference construction (src/, not the clean-rooms) against a second, genuinely different checkpoint in the same model family — 32 layers vs. 9, hidden_size 960 vs. 576, rope_theta=100000 (same as 135M) — sharing only the tokenizer with the primary vector. Confirmed bit-identical between an AVX2 x86_64 machine and a scalar (no AVX2/FMA) x86_64 machine on 2026-09-22.

Model: HuggingFaceTB/SmolLM2-360M, prompt "Once upon a time", gen_toks=16, spec v0.3b, dtype=fp32

weights_sha256          = 7aaff6661428bed033abba9522bec81938678642cca3181fe752b6ca9e1e540f
config_sha256            = 34f7801487078de7e434e19162c497e5cc6ff397080e40e8586627cb68a5168a
tokenizer_sha256          = 9ca9acddb6525a194ec8ac7a87f24fbba7232a9a15ffa1af0c1224fcd888e47c
table_digest              = 23c7bfaf5cef0095fd021af2eb1808abb4928bae4219756d86bdac670a06b35d
inv_freq_table_digest     = da9f6dcfde0425588815509e874515cdcd3d6b8818b6d0136590052e7bbf6f12
argmax_digest             = 90681903ebafdc4f8d8141be882e19b95b7a2c0f0761f16fa213df196db794a8
generated_token_ids       = 28,281,253,1666,1869,2025,28,665,436,253,9077,1379,1217,260,476,61

CIS2_REF (witness digest) = 3d159b94fd7a241fcc380bb6bc158cf03a6b4c13c03f46325c8a91d75c477dad

Reproduced via src/ (cis2_ref --weights-dir <dir>, default --gen-toks 16) on:

x86_64, AVX2, aefinity-box (box1) — 23.9s wall.
x86_64, scalar (no AVX2/FMA — Intel Celeron N4020), aefinity-box2 (box2), same commit, cross-machine replay — 43.2s wall.

Both machines produced the identical witness/argmax/table/inv_freq_table digests above, byte-for-byte, in a single run per machine (not just the in-process two-run check). table_digest and inv_freq_table_digest are identical to the primary SmolLM2-135M vector, as expected — both are independent of model weights (the transcendental-polynomial table is a fixed constant, and rope_theta=100000 is shared with 135M).

Informative: Qwen2.5-0.5B (theta-general RoPE exercise, `rope_theta=1000000`)

Not a §13.1 test vector; exercises §7's general RoPE construction against a second model family with a different rope_theta and vocab size.

gen_toks	`CIS2_REF` digest
16	`2c9f623589520aba9cc557edf53185808086f5f6f81cab5e78ee136d0375344c`
128	`dccd55e68a44eae3d62e36092295b40f980a07e1be72aadf37fe14ca306b20e7`

Scale/horizon evidence: Qwen2.5-1.5B and SmolLM2-135M at longer horizons

A later hardening pass confirmed x86_64/aarch64 digest equality (not listed here as literal hex — the source report records pass/fail assertions, not the raw digest values) for:

Qwen2.5-1.5B (~1.5B parameters) at gen_toks = 16, 128, and 512, plus a PyTorch fp32 oracle comparison at 16 and 512 tokens.
SmolLM2-135M at gen_toks=512.

These are cited here as evidence of scale- and horizon-robustness, not as reproducible literal digests in this document; a reproducer wanting exact hex values for these cases should regenerate them by running the reference construction at the stated (model, gen_toks) pairs and checking x86_64 vs. aarch64 equality directly, per §13.2 of the spec.

Sources

Reference-implementation CI results and hardware logs (private repository, not included here — see README "Scope").
docs/E15j_CLEANROOM_C_RESULT.md-equivalent CI run (C clean-room, verify3/), CI run id 33200155942 (post-§12.1-fix, 4/4 bit-exact on x86_64/aarch64 x gcc/clang).
Rust clean-room (verify2/) CI run id 33194049057 (spec v0.2, both ISAs).
Cross-ISA/compiler-invariance matrix CI run id 33195649908 (20/20 cells).
Longer-horizon/scale hardening CI run id 33214545380 (9/9 jobs).

Expected digests

Primary normative test vector (§13.1, spec v0.3b): SmolLM2-135M, gen_toks=16