[w3ctag/design-reviews] Web Neural Network API (#570)

Hi TAG!

I'm requesting a TAG review of the Web Neural Network API.

The Web Neural Network API (or WebNN API in short) is a specification for constructing and executing computational graphs of neural networks. It provides web applications with the ability to create, compile, and run machine learning networks on the web browsers. The WebNN API may be implemented in web browsers using the available native operating system machine learning APIs for the best performance and reliability of results.

  - Explainer: https://github.com/webmachinelearning/webnn/blob/master/explainer.md

  - Specification URL: https://webmachinelearning.github.io/webnn/

  - Tests: [mocha tests](https://webmachinelearning.github.io/webnn-polyfill/test/), plan to migrate to wpt testharness.js
  - Security and Privacy self-review: https://github.com/webmachinelearning/webnn/issues/119 (related: [it was suggested](https://www.w3.org/2020/06/machine-learning-workshop/report.html) the W3C TAG to drive coordination on the larger question of permission model for compute-heavy APIs (WebNN, WebGL, WebGPU, Wasm) from a platform-wide perspective)
  - GitHub repo: https://github.com/webmachinelearning/webnn

  - Primary contacts:
      - Ningxin Hu (@huningxin), Intel, Editor
      - Chai Chaoweeraprasit (@wchao1115), Microsoft, Editor
      - Anssi Kostiainen (@anssiko), Intel, Chair
  - Organization(s)/project(s) driving the specification: [Machine Learning for the Web Community Group](https://webmachinelearning.github.io/)
  - Key pieces of existing multi-stakeholder review or discussion of this specification: [Web and Machine Learning workshop report](https://www.w3.org/2020/06/machine-learning-workshop/report.html) and [spec GH issues](https://github.com/webmachinelearning/webnn/issues) 
  - External status/issue trackers for this specification:

Further details:

  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - Relevant time constraints or deadlines: We appreciate feedback by the end of 2020.
  - The group where the work on this specification is currently being done: [Machine Learning for the Web Community Group](https://webmachinelearning.github.io/)
  - The group where standardization of this work is intended to be done: Web Machine Learning Working Group (see [advance notice](https://lists.w3.org/Archives/Public/public-new-work/2020Oct/0001.html)) 
  - Major unresolved issues with or opposition to this specification: Appropriate API abstraction level discussed in [WG Charter GH repo](https://github.com/w3c/machine-learning-charter/issues)
  - This work is being funded by: N/A

You should also know that...

[please tell us anything you think is relevant to this review]

We'd prefer the TAG provide feedback as:

  🐛 open issues in our GitHub repo for **each point of feedback**

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