Crate rlx_pkg 

RLX package format (.rlxp) — flat mmap (default), ZIP, or directory.

Overview

Piece	Role
Package	Open flat / ZIP / dir; mmap hot weights; inflate warm/cold
write_package	Emit a pack from MIR graph + PackedWeight rows
WriteOptions::include_graph	Optional executable MIR (default on); weight-only when false
StorageTier	Hot (mmap) / warm (zstd_blocks) / cold (zstd)

Spec: docs/rlxp.md.

Bake exports via package_from_bake / rlx-bake --format rlxp. ONNX import with an executable graph lives on rlx-bake (--features onnx).

Features

• encrypt — seal_bytes / unseal_bytes (RLXSEAL1)
• remote — [RemoteFlat] HTTP Range reader

Structs

AutoTierOptions

Options for apply_auto_tier.

BakeWeight

Minimal weight row matching bake’s table (avoids depending on rlx-bake).

DdufImportOptions

Options for dduf_to_rlxp.

DistRef

Optional distribution section.

ExpertPlacement

Expert-parallel placement for one expert id.

FlatHeader

Fixed header before the TOC (24 bytes).

FlatToc

Table of contents after the fixed header.

GgufImportOptions

Options for gguf_to_rlxp.

GraphRef

Graph member reference inside the pack.

Manifest

Root package manifest (rlx.json).

MlxImportOptions

Options for mlx_to_rlxp.

NemoImportOptions

Options for nemo_to_rlxp.

Package

Opened RLX package.

PackedWeight

One weight to pack (from bake or another producer).

Placement

Distribution placement metadata.

PtImportOptions

Options for pt_to_rlxp.

SidecarRef

Named sidecar blob.

TensorShard

How one tensor is sharded across ranks.

VerifyReport

WeightEntry

One weight tensor in the package catalog.

WeightsIndex

Weight catalog file.

WeightsRef

Weights catalog pointer.

WriteOptions

Options for write_package.

Enums

Codec

On-disk encoding of a blob’s payload bytes.

ContainerKind

On-disk container kind.

MaterializeMode

Which weight tiers to bind into graph Constants on Package::graph.

MemberSource

Where package members are served from.

StorageTier

Access class for a blob inside a flat package.

Constants

COMPAT_VERSION

Minimum loader compat_version this crate supports.

DEFAULT_WARM_BLOCK

Default uncompressed block size for warm zstd_blocks (1 MiB).

FLAG_BINCODE_TOC

Flag bit: TOC is bincode rather than JSON.

FLAG_HYBRID

Flag bit: package uses hybrid hot/warm/cold codecs.

FLAT_CONTAINER_VERSION

Flat container format version. v2 = hybrid tiers; v1 still readable.

FLAT_MAGIC

Magic for the flat package (RLXPFLAT).

FORMAT_NAME

Package format identifier ("rlxp").

FORMAT_VERSION

Current structural schema version.

SEAL_MAGIC

Magic prefix for sealed blobs.

Functions

apply_auto_tier

Mutate weights tiers in place using heuristics / allow-lists.

checksum_hex

xxh3-64 hex checksum of raw (uncompressed) bytes.

dduf_to_rlxp

Convert model.dduf → .rlxp (weights + optional stub graph).

decode_zstd_block_at

Decode one warm block by index without inflating the whole tensor.

decode_zstd_blocks

Decode a warm ZBLK blob to owned raw bytes (sequential).

decode_zstd_blocks_parallel

Decode warm blocks in parallel via rayon (better for large tensors).

dtype_for_weight_scheme

Map RLXP scheme strings to a host bind dtype for set_param_typed.

encode_zstd_blocks

Encode a warm blob: header + per-block zstd frames.

gguf_to_rlxp

Convert model.gguf → .rlxp (weights + optional stub graph).

graph_with_stripped_weights

Strip named weight constant payloads from a graph clone (disk size win).

infer_container

Infer container from path / explicit override.

infer_zip_from_path

Back-compat alias: true → Zip, false → Dir; None uses path inference (.rlxp → Flat).

is_flat_magic

is_sealed

True if bytes begin with the seal magic.

mlx_to_rlxp

Convert an MLX weight path (dir / .safetensors / .npz / .npy) → .rlxp.

nemo_to_rlxp

Convert model.nemo → .rlxp (f32 weights + config / tokenizer sidecars).

package_from_bake

Write a package from a baked graph and weight table.

pt_to_rlxp

Convert a PyTorch checkpoint → .rlxp (dense f32 weights).

seal_bytes

unseal_bytes

verify_package

Verify every tensor (and optional sidecars) against TOC checksums.

write_package

Write a package to out (path inferred as flat / ZIP / dir unless WriteOptions::container is set).

write_package_dir

Write an unpacked directory package.

write_package_flat

Write the flat mmap package (default .rlxp).

write_package_zip

Write a ZIP64 STORE archive (inspectable; larger/slower than flat).