# ngt を Homebrew, Nix でインストール ngt のインストール経路、実行ファイル、メタデータ、AI エージェント向けセキュリティノートを確認します。 ## インストール ```sh sudo av install brew:ngt ``` 追加のインストールコマンド: ### macOS - Homebrew (100%): ```sh brew install ngt ``` 証拠: local Homebrew formula metadata ### Linux - Nix (92%): ```sh nix profile install nixpkgs#ngt ``` 証拠: nixpkgs package indexes: pkgs/by-name/ng/ngt/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 ## パッケージ情報 - **パッケージキー:** brew:ngt - **パッケージマネージャ:** Homebrew - **バージョン:** 2.7.4 - **ソース概要:** Neighborhood graph and tree for indexing high-dimensional data - **ホームページ:** - **リポジトリ:** - **最終更新:** 2026-05-08T19:35:29Z - **生成日時:** 2026-08-03T19:37:03+00:00 ## 実行可能ファイル - ngt (エイリアス) - qbg (エイリアス) ## インストール挙動 - Bottle: 利用不可 ## バージョンと鮮度 - ページ生成日: 2026-08-03 - マネージャ版: 2.7.4 ## プロジェクトの歴史と使われ方 NGT, Neighborhood Graph and Tree, is Yahoo Japan/LY Corporation's approximate nearest neighbor search library for large, high-dimensional vector data. It provides command-line tools and C, C++, and Python interfaces for building vector indices and searching them quickly. ### プロジェクトの歴史 Masajiro Iwasaki wrote in April 2023 that Yahoo! JAPAN Research released NGT as open-source software in September 2016. The GitHub README credits Yahoo Japan Corporation from 2015 and anchors the project in graph/tree approximate nearest-neighbor methods, later adding ONNG, NGTQ, QG, and QBG variants. The release notes embedded in the README show a progression from ONNG availability in August 2018, quantized NGT in December 2018, PyPI packaging in January and June 2019, QG in January 2021, FP16 in February 2022, and QBG/QG command consolidation in August 2022. Homebrew packaged stable version 2.7.4 on July 1, 2026. ### 採用の歴史 NGT's adoption is specialized but real in the vector-search world. The 2019 Opensource.com article says Yahoo! Japan used it for similarity-based fashion-item search, and the 2023 maintainer article says it was adopted by a number of Yahoo! JAPAN services through Vald. It is also cited in ANN benchmark and similarity-search literature. Homebrew analytics on July 1, 2026 reported 268 install-on-request events over 365 days, which fits the package's role: useful for ML/search engineers and benchmarking people, not a mainstream developer utility. ### 使われ方 The package-nerd path is to install `ngt`, generate or export vectors, create an index with a command such as `ngt create -d 300 -D c index objects.ssv`, and search with `ngt search -n 10 index query.ssv`. Python users can install the binding from PyPI under the `ngt` package and use `ngtpy`. QG and QBG matter when datasets get large enough that memory traffic dominates. The README describes NGT as graph/tree based, QG as quantized graph based, and QBG as quantized blob graph based; QBG is specifically documented for billion-object scale. ### タイムライン - {'date': '2016-09', 'event': "Yahoo! JAPAN Research released NGT as open-source software, according to Masajiro Iwasaki's 2023 article."} - {'date': '2018-08-08', 'event': 'ONNG became available in NGT v1.4.0.'} - {'date': '2019-01-17', 'event': 'Python NGT became installable through PyPI in v1.5.1.'} - {'date': '2021-01-15', 'event': 'NGT v1.13.0 added Quantized Graph support.'} - {'date': '2022-08-10', 'event': 'QBG and renewed QG became available in v2.0.0.'} ### Related projects - Vald - ANN-Benchmarks - Faiss - hnswlib - Annoy - ScaNN ### ソース - - - - - ## セキュリティノート ngt に一致するローカルシークレット処理マニフェストは見つかりませんでした。将来の対応で安定したパッケージ URL を使えるよう、Nucleus パッケージメタデータはここに公開されています。 ## 他のパッケージマネージャ記録 - Nix - ngt: normalized package name match | nixpkgs package indexes: pkgs/by-name/ng/ngt/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 ## Combined YAML source View the package source record on GitHub. [combined/ngt.yml](https://github.com/mxcl/pkgdb/blob/main/combined/ngt.yml) ## ソース - pkg.so package database - Geiger risk classifier - curated package history - pkgdb category and tag curation - external package-manager database matches - cross-ecosystem install command graph