base64-to-tensor
v1.2.16
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a pure js convert a base64 to a tensor object for node
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base64-to-tensor
pure js convert a base64 image to tensor
Installation
npm i base64-to-tensor --save
Getting Started
Make sure to have @tensorflow/tfjs-core
installed and a valid tensorflow backend set.
You also need to pick between sync package jpeg-js or async package sharp.
# pure js full sync blocking installation
npm i @tensorflow/tfjs-core jpeg-js
# if going to use async non blocking
npm i @tensorflow/tfjs-core sharp
View the convert.test.ts file for an example setup.
import { convert, convertAsync } from "base64-to-tensor";
import { setBackend } from "@tensorflow/tfjs-core";
import "@tensorflow/tfjs-backend-wasm";
await setBackend("wasm");
const tensor = convert(mybase64); // The base64 must be a valid jpeg image.
// or use native sharp for increased performance 2x [Expiremental]
const tensor = await convertAsync(mybase64);
// output example
// {
// kept: false,
// isDisposedInternal: false,
// shape: [189, 300, 3],
// dtype: "int32",
// size: 170100,
// strides: [900, 3],
// dataId: { id: 1 },
// id: 1,
// rankType: "3",
// }
Why
The benefits of using pure js to calc the image is in a couple areas:
- size and portablity required is drastically less since you do not need
cairo
or any of the native img dev converters. - speed is also faster since the calcs are done at hand without needing to bridge any calls.
- can use tensors in worker threads - allows for properly using Tensorflow wasm backends in an API service 🥳.
Benchmarks
Examples of some test ran on a mac m1(64gb):
| Name | chars | size | sync | async | | ---- | ----- | -------- | ----- | ----- | | jpeg | 26791 | 26.16 KB | 100ms | 50ms |