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EngramDB 的 Python 分发包

Disk-first storage engine for Engram / PLE n-gram memory tables (Rust).

分发名 engramdb-python(PyPI 相似名规避);import 名仍为 engramdb。

当前 v0.2.x 同时包含两条 Python 接入路径:

  1. PyO3 原生扩展(优先):crates/engramdb-pyo3,构建后以 python/engramdb/_engramdb.so 提供 Store / View / PageReader / Linux IoUringPageReader。
  2. ctypes C-ABI 回退:crates/engramdb-python,无 PyO3 构建产物时也能用。

python/engramdb/__init__.py 会自动优先加载 PyO3,失败则回退 ctypes。

快速使用

# 方式 1:maturin 构建 wheel(推荐,直接产生可安装的 native wheel)
cd python
CARGO_HOME=/tmp/cargo-home RUSTFLAGS="-C link-arg=-undefined -C link-arg=dynamic_lookup" \
  maturin build --release --interpreter python3

# 方式 2:开发期内直接构建并复制到包目录
CARGO_HOME=/tmp/cargo-home RUSTFLAGS="-C link-arg=-undefined -C link-arg=dynamic_lookup" \
  cargo build -p engramdb-pyo3 --release
cp target/release/lib_engramdb.dylib python/engramdb/_engramdb.so

# 在 engram-peft 等项目中用 uv 添加本地开发依赖
cd ~/code/engram-peft
uv add --editable ../EngramDB/python

# 发布到 PyPI 后可直接:
# uv add engramdb-python
import engramdb

# 打开 Store-I:目录内为 shard_000.bin 等定长行文件
store = engramdb.Store("path/to/rows", shards=1, rows_per_shard=100, width=256)
row_bytes = store.fetch([0, 1, 2])   # bytes, 每条 256B
store.close()

# 打开 Store-P 视图
view = engramdb.View("path/to/view.bin")
rec = view.read_record(0)            # 一条 e_t 记录

# SGLang 兼容:从多个 fd/offset 读页(Unix 有 PageReader,Linux 另有 IoUringPageReader)
reader = engramdb.PageReader(page_size=4096)
pages = reader.read_pages([fd0, fd1], [offset0, offset1])

引擎适配层

  • engramdb.sglang.SGLangPageReader:与 SGLang IoUringReader.read_pages(fds, offsets) 同形的适配器,Linux 优先用 IoUringPageReader。
  • engramdb.vllm_plugin.DiskPleEmbedding / patch_named_embedding:用 EngramDB 替代模型中 PLE 表的 nn.Embedding,内部走 PleDiskGather 去重+批量读+展开。

engram-peft 集成

安装 engramdb-python 后,可以直接使用内置的磁盘版 MultiHeadEmbedding:

import engramdb
from engramdb.integrations import install_disk_multi_head_embedding

store = engramdb.Store("path/to/embedding-store", shards=1, rows_per_shard=100, width=256)
install_disk_multi_head_embedding(store)

# 之后再调用 engram-peft 的 get_engram_model(...) 即可让 Engram 层从磁盘读取 embedding

定位(一句话)

让"确定性哈希的 n-gram 记忆表"(Qwen PLE、DeepSeek Engram 等)像数据库一样落盘、建索引、预取、服务化——单机 CPU+NVMe 低延迟推理 / 高吞吐训练预处理。

详细文档见上游仓库 docs/(design.md / specifications / roadmap)以及 examples/interop_engram_peft.py。

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0.3.0

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