ncnn

ncnn is a high-performance neural network inference framework optimized for the mobile platform

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Homepage

Project description

ncnn

ncnn is a high-performance neural network inference computing framework optimized for mobile platforms. ncnn is deeply considerate about deployment and uses on mobile phones from the beginning of design. ncnn does not have third-party dependencies. It is cross-platform and runs faster than all known open-source frameworks on mobile phone cpu. Developers can easily deploy deep learning algorithm models to the mobile platform by using efficient ncnn implementation, creating intelligent APPs, and bringing artificial intelligence to your fingertips. ncnn is currently being used in many Tencent applications, such as QQ, Qzone, WeChat, Pitu, and so on.

ncnn 是一个为手机端极致优化的高性能神经网络前向计算框架。 ncnn 从设计之初深刻考虑手机端的部署和使用。无第三方依赖，跨平台，手机端 cpu 的速度快于目前所有已知的开源框架。基于 ncnn，开发者能够将深度学习算法轻松移植到手机端高效执行，开发出人工智能 APP，将 AI 带到你的指尖。 ncnn 目前已在腾讯多款应用中使用，如：QQ，Qzone，微信，天天 P 图等。

技术交流 QQ 群 637093648 (超多大佬) 答案：卷卷卷卷卷（已满）	Telegram Group https://t.me/ncnnyes	Discord Channel https://discord.gg/YRsxgmF
Pocky QQ 群（MLIR YES!） 677104663 (超多大佬) 答案：multi-level intermediate representation
他们都不知道 pnnx 有多好用群 818998520 (新群！)

Download & Build status

https://github.com/Tencent/ncnn/releases/latest

	how to build ncnn library on Linux / Windows / macOS / Raspberry Pi3, Pi4 / POWER / Android / NVIDIA Jetson / iOS / WebAssembly / AllWinner D1 / Loongson 2K1000
	Source
	Build for Android Build for Termux on Android
	Android
	Android shared
	Build for HarmonyOS with cross-compiling
	HarmonyOS
	HarmonyOS shared
	Build for iOS on macOS with xcode
	iOS
	iOS-Simulator
	Build for macOS
	macOS
	Mac-Catalyst
	watchOS
	watchOS-Simulator
	tvOS
	tvOS-Simulator
	visionOS
	visionOS-Simulator
	Apple xcframework
	Build for Linux / NVIDIA Jetson / Raspberry Pi3, Pi4 / POWER
	Ubuntu 20.04
	Ubuntu 22.04
	Ubuntu 24.04
	Build for Windows x64 using VS2017 Build for Windows x64 using MinGW-w64
	VS2015
	VS2017
	VS2019
	VS2022
	Build for WebAssembly
	WebAssembly
	Build for ARM Cortex-A family with cross-compiling Build for Hisilicon platform with cross-compiling Build for AllWinner D1 Build for Loongson 2K1000 Build for QNX
	Linux (arm)
	Linux (aarch64)
	Linux (mips)
	Linux (mips64)
	Linux (ppc64)
	Linux (riscv64)
	Linux (loongarch64)

Support most commonly used CNN network

支持大部分常用的 CNN 网络

Classical CNN: VGG AlexNet GoogleNet Inception ...
Practical CNN: ResNet DenseNet SENet FPN ...
Light-weight CNN: SqueezeNet MobileNetV1 MobileNetV2/V3 ShuffleNetV1 ShuffleNetV2 MNasNet ...
Face Detection: MTCNN RetinaFace scrfd ...
Detection: VGG-SSD MobileNet-SSD SqueezeNet-SSD MobileNetV2-SSDLite MobileNetV3-SSDLite ...
Detection: Faster-RCNN R-FCN ...
Detection: YOLOv2 YOLOv3 MobileNet-YOLOv3 YOLOv4 YOLOv5 YOLOv7 YOLOX YOLOv8 ...
Detection: NanoDet
Segmentation: FCN PSPNet UNet YOLACT ...
Pose Estimation: SimplePose ...

HowTo

use ncnn with alexnet with detailed steps, recommended for beginners :)

ncnn 组件使用指北 alexnet 附带详细步骤，新人强烈推荐 :)

use netron for ncnn model visualization

use ncnn with pytorch or onnx

ncnn low-level operation api

ncnn param and model file spec

ncnn operation param weight table

how to implement custom layer step by step

FAQ

ncnn throw error

ncnn produce wrong result

ncnn vulkan

Features

Supports convolutional neural networks, supports multiple input and multi-branch structure, can calculate part of the branch
No third-party library dependencies, does not rely on BLAS / NNPACK or any other computing framework
Pure C++ implementation, cross-platform, supports Android, iOS and so on
ARM NEON assembly level of careful optimization, calculation speed is extremely high
Sophisticated memory management and data structure design, very low memory footprint
Supports multi-core parallel computing acceleration, ARM big.LITTLE CPU scheduling optimization
Supports GPU acceleration via the next-generation low-overhead Vulkan API
Extensible model design, supports 8bit quantization and half-precision floating point storage, can import caffe/pytorch/mxnet/onnx/darknet/keras/tensorflow(mlir) models
Support direct memory zero copy reference load network model
Can be registered with custom layer implementation and extended
Well, it is strong, not afraid of being stuffed with 卷 QvQ

功能概述

支持卷积神经网络，支持多输入和多分支结构，可计算部分分支
无任何第三方库依赖，不依赖 BLAS/NNPACK 等计算框架
纯 C++ 实现，跨平台，支持 Android / iOS 等
ARM Neon 汇编级良心优化，计算速度极快
精细的内存管理和数据结构设计，内存占用极低
支持多核并行计算加速，ARM big.LITTLE CPU 调度优化
支持基于全新低消耗的 Vulkan API GPU 加速
可扩展的模型设计，支持 8bit 量化和半精度浮点存储，可导入 caffe/pytorch/mxnet/onnx/darknet/keras/tensorflow(mlir) 模型
支持直接内存零拷贝引用加载网络模型
可注册自定义层实现并扩展
恩，很强就是了，不怕被塞卷 QvQ

supported platform matrix

✅ = known work and runs fast with good optimization
✔️ = known work, but speed may not be fast enough
❔ = shall work, not confirmed
/ = not applied

	Windows	Linux	Android	macOS	iOS
intel-cpu	✔️	✔️	❔	✔️	/
intel-gpu	✔️	✔️	❔	❔	/
amd-cpu	✔️	✔️	❔	✔️	/
amd-gpu	✔️	✔️	❔	❔	/
nvidia-gpu	✔️	✔️	❔	❔	/
qcom-cpu	❔	✔️	✅	/	/
qcom-gpu	❔	✔️	✔️	/	/
arm-cpu	❔	❔	✅	/	/
arm-gpu	❔	❔	✔️	/	/
apple-cpu	/	/	/	✔️	✅
apple-gpu	/	/	/	✔️	✔️
ibm-cpu	/	✔️	/	/	/

Project examples

https://github.com/magicse/ncnn-colorization-siggraph17

https://github.com/mizu-bai/ncnn-fortran Call ncnn from Fortran
https://github.com/k2-fsa/sherpa Use ncnn for real-time speech recognition (i.e., speech-to-text); also support embedded devices and provide mobile Apps (e.g., Android App)

License

BSD 3 Clause

Project details

These details have not been verified by PyPI

Project links

Homepage

Release history Release notifications | RSS feed

1.0.20260114

Jan 14, 2026

1.0.20250916

Sep 16, 2025

1.0.20250503

May 3, 2025

This version

1.0.20250428

Apr 28, 2025

1.0.20241226

Dec 26, 2024

1.0.20240820

Aug 20, 2024

1.0.20240410

Apr 10, 2024

1.0.20240102

Jan 2, 2024

1.0.20231027

Oct 27, 2023

1.0.20230816

Aug 16, 2023

1.0.20230517

May 17, 2023

1.0.20230223

Feb 23, 2023

1.0.20221128

Nov 28, 2022

1.0.20220729

Jul 29, 2022

1.0.20220721

Jul 21, 2022

1.0.20220701

Jul 1, 2022

1.0.20220420

Apr 20, 2022

1.0.20220419

Apr 19, 2022

1.0.20220216

Feb 16, 2022

1.0.20211208

Dec 8, 2021

1.0.20210720

Jul 20, 2021

1.0.20210525

May 25, 2021

1.0.2023.2.23

Feb 23, 2023

1.0.2022.11.28

Nov 28, 2022

1.0.2022.7.29

Jul 29, 2022

1.0.2022.7.21

Jul 21, 2022

1.0.2022.7.1

Jul 1, 2022

1.0.2022.4.20

Apr 20, 2022

1.0.2022.4.19

Apr 19, 2022

1.0.2022.2.16

Feb 16, 2022

1.0.2021.12.8

Dec 8, 2021

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ncnn 1.0.20250428

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Support most commonly used CNN network

支持大部分常用的 CNN 网络

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