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tfjs

授权协议 Apache-2.0 License

开发语言 Python

所属分类神经网络/人工智能、机器学习/深度学习

软件类型开源软件

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投递者慕容安易

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软件概览

TensorFlow.js

TensorFlow.js is an open-source hardware-accelerated JavaScript library fortraining and deploying machine learning models.

Develop ML in the Browser
Use flexible and intuitive APIs to build models from scratch using the low-levelJavaScript linear algebra library or the high-level layers API.

Develop ML in Node.js
Execute native TensorFlow with the same TensorFlow.js API under the Node.jsruntime.

Run Existing models
Use TensorFlow.js model converters to run pre-existing TensorFlow models rightin the browser.

Retrain Existing models
Retrain pre-existing ML models using sensor data connected to the browser orother client-side data.

About this repo

This repository contains the logic and scripts that combineseveral packages.

APIs:

TensorFlow.js Core,a flexible low-level API for neural networks and numerical computation.
TensorFlow.js Layers,a high-level API which implements functionality similar toKeras.
TensorFlow.js Data,a simple API to load and prepare data analogous totf.data.
TensorFlow.js Converter,tools to import a TensorFlow SavedModel to TensorFlow.js
TensorFlow.js Vis,in-browser visualization for TensorFlow.js models
TensorFlow.js AutoML,Set of APIs to load and run models produced byAutoML Edge.

Backends/Platforms:

TensorFlow.js CPU Backend, pure-JS backend for Node.js and the browser.
TensorFlow.js WebGL Backend, WebGL backend for the browser.
TensorFlow.js WASM Backend, WebAssembly backend for the browser.
TensorFlow.js WebGPU, WebGPU backend for the browser.
TensorFlow.js Node, Node.js platform via TensorFlow C++ adapter.
TensorFlow.js React Native, React Native platform via expo-gl adapter.

If you care about bundle size, you can import those packages individually.

If you are looking for Node.js support, check out the TensorFlow.js Node directory.

Examples

Check out ourexamples repositoryand our tutorials.

Gallery

Be sure to check out the gallery of all projects related to TensorFlow.js.

Pre-trained models

Be sure to also check out our models repository where we host pre-trained modelson NPM.

Benchmarks

Local benchmark tool. Use this webpage tool to collect the performance related metrics (speed, memory, etc) of TensorFlow.js models and kernels on your local device with CPU, WebGL or WASM backends. You can benchmark custom models by following this guide.
Multi-device benchmark tool. Use this tool to collect the same performance related metrics on a collection of remote devices.

Getting started

There are two main ways to get TensorFlow.js in your JavaScript project:via script tags or by installing it from NPMand using a build tool like Parcel,WebPack, or Rollup.

via Script Tag

Add the following code to an HTML file:

<html>
  <head>
    <!-- Load TensorFlow.js -->
    <script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs/dist/tf.min.js"> </script>


    <!-- Place your code in the script tag below. You can also use an external .js file -->
    <script>
      // Notice there is no 'import' statement. 'tf' is available on the index-page
      // because of the script tag above.

      // Define a model for linear regression.
      const model = tf.sequential();
      model.add(tf.layers.dense({units: 1, inputShape: [1]}));

      // Prepare the model for training: Specify the loss and the optimizer.
      model.compile({loss: 'meanSquaredError', optimizer: 'sgd'});

      // Generate some synthetic data for training.
      const xs = tf.tensor2d([1, 2, 3, 4], [4, 1]);
      const ys = tf.tensor2d([1, 3, 5, 7], [4, 1]);

      // Train the model using the data.
      model.fit(xs, ys).then(() => {
        // Use the model to do inference on a data point the model hasn't seen before:
        // Open the browser devtools to see the output
        model.predict(tf.tensor2d([5], [1, 1])).print();
      });
    </script>
  </head>

  <body>
  </body>
</html>

Open up that HTML file in your browser, and the code should run!

via NPM

Add TensorFlow.js to your project using yarn or npm. Note: Becausewe use ES2017 syntax (such as import), this workflow assumes you are using a modern browser or a bundler/transpilerto convert your code to something older browsers understand. See ourexamplesto see how we use Parcel to buildour code. However, you are free to use any build tool that you prefer.

import * as tf from '@tensorflow/tfjs';

// Define a model for linear regression.
const model = tf.sequential();
model.add(tf.layers.dense({units: 1, inputShape: [1]}));

// Prepare the model for training: Specify the loss and the optimizer.
model.compile({loss: 'meanSquaredError', optimizer: 'sgd'});

// Generate some synthetic data for training.
const xs = tf.tensor2d([1, 2, 3, 4], [4, 1]);
const ys = tf.tensor2d([1, 3, 5, 7], [4, 1]);

// Train the model using the data.
model.fit(xs, ys).then(() => {
  // Use the model to do inference on a data point the model hasn't seen before:
  model.predict(tf.tensor2d([5], [1, 1])).print();
});

See our tutorials, examplesand documentation for more details.

Importing pre-trained models

We support porting pre-trained models from:

Various ops supported in different backends

Please refer below :

TFJS Ops Metrix

Find out more

TensorFlow.js is a part of theTensorFlow ecosystem. For more info:

For help from the community, use tensorflow.js tag on Stack Overflow.
js.tensorflow.org
Tutorials
API reference
Discussion mailing list
TensorFlow.js Blog

Thanks, BrowserStack, for providing testing support.

使用案例

tfjs 内存管理 tidy

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开始年前的时候就有这个想法，想做一个能够人脸识别和物体识别，并且能简单对话识别指令的助手，类似小爱同学离线增强版，顺便能监控自己的小屋。不过年底太忙根本没有时间精力去折腾，想着年初再搞，谁知道来了个疫情，突然多出那么多空闲时间，可惜树莓派还没来得及买，浪费了大把时间。复工后中间还出了次差，这又快到年底了终于克服懒癌晚期，把基本的功能实现出来。这里写下来做个记录，毕竟年级大了记性不太好。树