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feat: safetensors discovery and optional mmap GGUF dequant - #73
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📝 SummarySummary by CodeRabbit
WalkthroughThe crate adds packed GGUF dequantization, optional ChangesGGUF dequantization
Memory-mapped GGUF loading
Safetensors inspection
Feature wiring and documentation
Priority: ⚪ Pending latest changes Estimated code review effort: 5 (Critical) | ~90 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)Safetensors inspectionsequenceDiagram
participant Caller
participant inspect_safetensors_checkpoint
participant PathResolver
participant JsonParser
participant ManifestBuilder
participant CandidateDiscovery
Caller->>inspect_safetensors_checkpoint: checkpoint path
inspect_safetensors_checkpoint->>PathResolver: resolve files and shards
inspect_safetensors_checkpoint->>JsonParser: parse headers and index
JsonParser-->>ManifestBuilder: validated tensor metadata
ManifestBuilder->>CandidateDiscovery: tensor records
CandidateDiscovery-->>ManifestBuilder: router and expert candidates
ManifestBuilder-->>Caller: SafetensorsManifest
Mapped GGUF accesssequenceDiagram
participant Caller
participant load_gguf_mmap
participant memmap2
participant parse_layout
participant GgufLayoutMmap
Caller->>load_gguf_mmap: GGUF path
load_gguf_mmap->>memmap2: create read-only mapping
load_gguf_mmap->>parse_layout: parse mapped bytes
parse_layout-->>GgufLayoutMmap: metadata and tensor directory
GgufLayoutMmap-->>Caller: tensor bytes or page-aligned view
Merge Risk: 🟠 High · up to The new CPU dequantization for Q5_K and Q6_K checkpoints appears to return weight values in the wrong positions, so anything consuming these tensors would silently get incorrect numbers; the accompanying tests use uniform values and cannot catch it. Separately, the new Safetensors header reader can crash the process on a deeply nested file and rejects some valid headers that escape emoji-style characters. The dequantization ordering should be fixed and covered by a test with distinct per-position values before merging. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (1 warning, 1 inconclusive)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The PR implements the coding scope in Full details: Docstring CoverageExplanation Docstring coverage is 46.08% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 217 functions across 18 files. (5 skipped: 5 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Review Summary
This PR adds substantial new functionality for safetensors inspection and optional mmap-based GGUF dequantization. The implementation is generally well-structured with comprehensive test coverage and good error handling.
Critical Issue Found
- Division by zero risk in
src/gguf/map.rsline 154 if page size is zero - requires fix before merge
Strengths
- Zero-dependency JSON parser with duplicate key rejection
- Comprehensive overflow checks in arithmetic operations
- Well-documented unsafe code with clear safety contracts
- Extensive test coverage for quantization formats
- Proper feature-gating for optional dependencies
The code quality is high overall. Please address the critical division-by-zero issue before merging.
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Cursor Bugbot has reviewed your changes using high effort and found 3 potential issues.
Bugbot Autofix prepared fixes for all 3 issues found in the latest run.
- ✅ Fixed: K-quant dequant scrambles value order
- Q5_K and Q6_K now write GGML 32-wide groups (y[l], y[l+32], and for Q6_K also y[l+64]/y[l+96]) instead of interleaved nibble pairs.
- ✅ Fixed: Q6_K block field order is wrong
- dequantize_row_q6_k now reads GGUF block_q6_K as ql[128], qh[64], scales[16], then d as the last two bytes.
- ✅ Fixed: JSON parser recurses without depth limit
- The Safetensors JSON parser now rejects nesting beyond 32 levels so a small crafted header cannot overflow the stack.
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Bugbot showed Q6_K field order and Q5_K/Q6_K group writes diverged from ggml-common.h / dequantize_row_q*_K, so real GGUF payloads would permute. Also reject a zero OS page size and cap JSON nesting. Co-authored-by: Cursor Agent <cursoragent@cursor.com>
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Actionable comments posted: 8
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Inline comments:
In `@src/gguf/dequant.rs`:
- Around line 323-324: Update the row-processing loop around dequant_row to
avoid allocating a new Vec<f32> for every row: either make the row decoder
append directly into out or reuse one width-sized scratch buffer across
iterations, while preserving the existing output ordering and error propagation.
- Around line 188-189: Fix positional ordering in both dequantizers: at
src/gguf/dequant.rs lines 188-189, emit each 64-value sub-block’s 32 low-nibble
values before its 32 high-nibble values; at lines 222-225, place lane values at
offsets l, l + 32, l + 64, and l + 96 within each 128-value group instead of
appending consecutively. Add tests using distinct per-position values to assert
the decoded order.
In `@src/gguf/map.rs`:
- Line 183: Update directory_matches to compare each tensor key and its
directory fields, not just the tensor counts, including names, dtypes,
dimensions, offsets, and byte lengths. Preserve true only for fully matching
tensor directories, and add a test covering equal tensor counts with one
differing tensor entry.
- Line 199: Update the SC_PAGESIZE constant used by tensor_page_aligned_bytes to
select the correct dependency-free _SC_PAGESIZE value per supported BSD target:
29 on Darwin, 47 on FreeBSD, and 28 on NetBSD/OpenBSD. Preserve the existing
fallback behavior and do not add libc or other dependencies.
In `@src/safetensors/json.rs`:
- Around line 232-237: Update the Unicode escape handling in the parser’s `'u'`
branch to combine a high surrogate with the immediately following \u low
surrogate before constructing the character. Reject missing or invalid low
surrogates, while preserving existing validation for non-surrogate code units;
factor this through a helper near parse_unicode_escape if appropriate.
- Around line 200-212: Update the parser state and parse_value recursion to
track nesting depth and return a parse error when a fixed maximum depth is
exceeded. Ensure depth is incremented before descending into parse_object or
parse_array and restored afterward, including error paths, while preserving
existing parsing behavior below the limit.
In `@src/safetensors/manifest.rs`:
- Around line 502-505: In the metadata assembly flow, remove
INDEX_UNREFERENCED_SHARDS_KEY after the merge loop and before the computed
unreferenced-shards value is inserted. Update the logic around
merge_shard_metadata so shard headers cannot leave a stale reserved key when
unreferenced_shards_json is None, while preserving insertion of the computed
value when present.
In `@src/safetensors/paths.rs`:
- Around line 209-210: Update index_shard_path and inspect_index_shards to open
each shard through a single validated file handle rather than returning and
reopening a path. Validate the opened file remains under root, then pass that
handle to inspect_shard for header inspection, preserving the existing
containment error behavior.
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⛔ Files ignored due to path filters (1)
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📒 Files selected for processing (28)
CHANGELOG.mdCargo.tomlREADME.mdREVIEW.mdsrc/error.rssrc/gguf/dequant.rssrc/gguf/layout.rssrc/gguf/map.rssrc/gguf/mod.rssrc/gguf/tensor.rssrc/lib.rssrc/safetensors/discovery.rssrc/safetensors/json.rssrc/safetensors/manifest.rssrc/safetensors/mod.rssrc/safetensors/paths.rssrc/safetensors/tests.rssrc/safetensors/validate.rstests/fixtures/safetensors/directory/a.safetensorstests/fixtures/safetensors/directory/b.safetensorstests/fixtures/safetensors/sharded/model-00001-of-00002.safetensorstests/fixtures/safetensors/sharded/model-00002-of-00002.safetensorstests/fixtures/safetensors/sharded/model.safetensors.index.jsontests/fixtures/safetensors/single/model.safetensorstests/gguf_smoke.rstests/mmap_gguf.rstests/real_gguf.rstests/safetensors_smoke.rs
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🔇 Additional comments (15)
src/gguf/tensor.rs (1)
14-15: LGTM!Also applies to: 89-94, 146-146, 225-227, 260-260, 298-298, 342-343, 408-409, 619-619, 659-659, 784-786, 802-802, 844-844, 864-871
src/gguf/mod.rs (1)
7-8: LGTM!Also applies to: 11-11, 13-14, 20-23, 25-26, 30-34, 50-53
src/lib.rs (1)
11-12: LGTM!Also applies to: 16-17, 22-24, 49-50, 70-70, 105-109, 113-113, 116-117
tests/mmap_gguf.rs (1)
74-74: 🎯 Functional Correctness
PageAlignedTensorBytes::tensor_bytesis defined insrc/gguf/map.rs:70-74as a public method. The call intests/mmap_gguf.rstherefore has a matching method and does not fail for this reason.src/safetensors/validate.rs (1)
15-170: LGTM!src/safetensors/discovery.rs (1)
83-434: LGTM!src/safetensors/tests.rs (1)
59-979: LGTM!tests/gguf_smoke.rs (1)
235-235: LGTM!Also applies to: 483-483
tests/safetensors_smoke.rs (1)
9-11: 🗄️ Data Integrity & IntegrationAll referenced Safetensors fixtures are present, including the single payload, both shard payloads, and both directory payloads. Each file has a 61-byte header, a 2-byte data section, and contiguous
[0, 2]offsets. The missing-fixture and malformed-payload concerns do not apply.src/safetensors/paths.rs (1)
1-159: LGTM!Also applies to: 172-207, 211-211
src/safetensors/mod.rs (1)
1-71: LGTM!CHANGELOG.md (1)
7-23: LGTM!Also applies to: 26-26, 31-36, 39-40
README.md (1)
6-12: LGTM!Also applies to: 23-24, 26-30, 39-39, 46-46, 60-62, 72-72, 78-78, 98-100, 114-114, 185-200, 204-215, 222-224, 230-236, 256-264, 272-272
REVIEW.md (1)
6-12: LGTM!Also applies to: 16-16
tests/fixtures/safetensors/sharded/model.safetensors.index.json (1)
1-7: LGTM!
Codex P2/P1 follow-ups: `chunks_exact(0)` panics on width 0, JSON `1e400` became `inf`, Unix `\` in shard names was rewritten, and empty directory shards bypassed the manifest overwrite guard. Co-authored-by: Cursor Agent <cursoragent@cursor.com>
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CI `cargo fmt --check` failed on the directory shard listing helper. Co-authored-by: Cursor Agent <cursoragent@cursor.com>
CodeRabbit: use target-correct `_SC_PAGESIZE` constants without libc, and strip a shard-supplied unreferenced-shards key before writing the computed index value. Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Dismissed: CodeRabbit must not block (Raul/CoS standing rule).
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| for (i, sc_val) in sc.iter_mut().enumerate() { | ||
| let high_bits = ((scales_h_u32 >> (i * 2)) & 0x03) as u8; | ||
| *sc_val |= high_bits << 6; |
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When an IQ3_M block has nonzero scales_h, this per-scale shift consumes the byte after the first four iterations, so scales 4–15 always receive zero high bits; it also assigns the remaining three two-bit fields only to scales 1–3 instead of their corresponding scale groups. Such blocks are therefore dequantized with incorrect multipliers despite having a valid 111-byte layout; decode each of the four two-bit fields for its associated group of scales.
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| pub(super) fn relative_path(path: &Path, root: &Path) -> String { | ||
| let stripped = path.strip_prefix(root).unwrap_or(path); | ||
| let lossy = stripped.to_string_lossy(); |
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On Unix, when an explicitly supplied index sits beside an unreferenced shard whose filename contains non-UTF-8 bytes, to_string_lossy() replaces those bytes with U+FFFD. The separator fix still leaves this fresh case: reject_output_checkpoint_conflict reconstructs a different path from the lossy unreferenced-shard metadata, so write_safetensors_manifest(index_path, actual_shard_path) bypasses the guard and overwrites the shard. Reject non-UTF-8 shard names or retain the original PathBufs for identity checks.
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| self.seen_deepseek_v3_family |= | ||
| parts.lower.contains("moonlight") || parts.lower.contains("block_sparse_moe"); |
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A normal Mixtral checkpoint uses names such as model.layers.0.block_sparse_moe.gate.weight and ...experts.0.w1.weight; once both router and expert evidence are present, this condition labels it deepseek_v3_family. Since block_sparse_moe is shared by multiple unrelated MoE architectures, the public manifest reports the wrong family for common non-DeepSeek models; require a DeepSeek-specific naming signal rather than this generic container name.
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| edition = "2024" | ||
| rust-version = "1.97.1" | ||
| description = "Pure-Rust, zero-dependency GGUF deserializer and Mixture-of-Experts per-expert weight extractor. Returns raw byte buffers with shape metadata; performs no neural-network math." | ||
| description = "Pure-Rust GGUF/Safetensors checkpoint parser and Mixture-of-Experts per-expert weight extractor. Default builds are zero-dependency (`fs::read` into `Vec<u8>`). Optional `mmap` feature adds memmap2. Packed dequant for Q8_0/Q5_K/Q6_K/IQ3_M. Off-by-default `safetensors` feature is header/manifest/discovery only (no extra crates)." |
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When this version is published to crates.io, the new 329-character description exceeds the registry's 255-character metadata limit, so the upload is rejected before the release can be created. Shorten this field and leave the feature details in the README.
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| unsafe extern "C" { | ||
| fn sysconf(name: i32) -> i64; |
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On 32-bit Unix targets such as i686 or armv7 Linux, sysconf returns a 32-bit C long, but this FFI declaration expects an i64; the caller therefore reads a two-register 64-bit result even though libc only returned one word. Even with the corrected Linux selector, this fresh 32-bit case can make os_page_size() accept garbage upper bits and compute invalid page-aligned tensor ranges. Declare the return value using the target's C long representation, such as isize on these Unix targets.
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Upstream first: rmems/engram-parser#73 closed #45 with an optional mmap feature and packed Q8_0/Q5_K/Q6_K/IQ3_M dequant. Unblock #115; CUDA host-register stays in this crate.
…75) Option 1 for #45/RM-367 already shipped in #73. This tightens the acceptance gap CodeRabbit flagged: directory_matches compares the full tensor directory, Q8_0/Q5_K row dequant fail closed on short rows, and CI mmap tests cover packed Q8_0/Q5_K/Q6_K/IQ3_M dequant from the mapping plus a sparse 2 GiB file that is never fs::read. Co-authored-by: Cursor Agent <cursoragent@cursor.com> Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Upstream first: rmems/engram-parser#73 closed #45 with an optional mmap feature and packed Q8_0/Q5_K/Q6_K/IQ3_M dequant. Unblock #115; CUDA host-register stays in this crate.
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User description
Summary
Land Corinth extraction of Safetensors header/manifest/discovery and optional mmap + K-quant dequant so Corinth can later adopt this crate instead of keeping a local copy.
safetensorsfeature: header-only inspection, deterministic manifests, single-file / Hugging Face shard-index / directory layouts, and MoE router/expert candidate discovery. Zero extra crates; no payload mmap and no Hugging Faceconfig.jsonpolicy.mmapfeature (memmap20.9.11):load_gguf_mmapplus packed CPU dequant for Q8_0, Q5_K, Q6_K, and the internal IQ3_M block layout. Default builds stay zero-dep.DType::Other(31)). IQ3_M uses internalGGML_TYPE_IQ3_M_BLOCK = 0x4949334D(111 bytes / 256 values). CUDA host-register remains out of scope. Real multi-GB mmap parity is#[ignore]behindENGRAM_GGUF.Test plan
cargo test(default)cargo test --features mmapcargo test --features safetensorscargo test --all-features— 104 passed, 3 ignored locallyRelationships
Closes #10
Closes #45
This PR ships the in-repo Safetensors feature and the mmap + Q8_0/Q5_K/Q6_K/IQ3_M surface. Corinth
MODULE_STATUS/PROMOTION_RULESremain on rmems/corinth-canal#116 (docs, not this crate).Refs rmems/corinth-canal#115
Refs rmems/corinth-canal#116
Refs rmems/corinth-canal#144
Refs rmems/corinth-canal#161
Linear twins (GitHub is source of truth; Linear MCP was unavailable this turn, so twins were not updated):
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CodeAnt-AI Description
Add Safetensors inspection, GGUF mmap loading, and packed dequantization
What Changed
safetensorsfeature for single files, shard indexes, and directories, with deterministic manifests and MoE router/expert discoveryf32; wire type 31 remains Q4_0_4_4Impact
✅ Safetensors checkpoint inventories✅ Lower memory during large GGUF loading✅ CPU dequantization for four packed formats💡 Usage Guide
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Summary by cubic
Adds off-by-default Safetensors header/manifest/discovery support (#10) and an optional memory-mapped GGUF reader with packed CPU dequantization (#45), so Corinth can adopt this crate without a local copy. Default builds remain zero-dependency, and the Q5_K/Q6_K decoders now match ggml's field layout and emit order for real payloads; wire type 31 remains historical Q4_0_4_4.
New Features
safetensorsinspects single files, Hugging Face shard indexes, and directories, builds deterministic manifests, discovers MoE candidates, and validates headers, ranges, paths, duplicate keys, output conflicts, and JSON nesting without extra crates.mmapaddsload_gguf_mmapviamemmap20.9.11, page-aligned tensor ranges with target-correct OS page-size detection, and CPU dequantization for Q8_0, Q5_K, Q6_K, and the internal IQ3_M block layout; Safetensors payload mmap, Hugging Faceconfig.jsonpolicy, and CUDA host registration remain out of scope.Bug Fixes
Written for commit c3eb2b9. Summary will update on new commits.