How to run tensorflow tfjs-models demos?

if you follow the guider in README.md, it may fail.

rm -rf .cache dist node_modules
yarn

It will prompt you to run yarn install first.

Internal Error: @tensorflow-models/pose-detection@workspace:.: This package doesn't seem to be present in your lockfile; run "yarn install" to update the lockfile
    at Xx.getCandidates (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:205:8149)
    at Dd.getCandidates (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:141:1311)
    at /home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:210:8409
    at Ky (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:140:53916)
    at Fe (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:210:8389)
    at async Promise.allSettled (index 0)
    at async Uc (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:140:53244)
    at async /home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:210:9140
    at async Qi.startProgressPromise (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:140:137284)
    at async Pt.resolveEverything (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:210:7138)

and you may encounter this error too.

➤ YN0001: │ Error: @tensorflow-models/pose-detection@file:../../dist#../../dist::hash=6b035b&locator=posedetection_demo%40workspace%3A.: Manifest not found
    at AE.find (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:140:120021)
    at async /home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:559:6256
    at async Object.bZe (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:140:53847)
    at async O2.resolve (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:559:6217)
    at async Dd.resolve (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:141:1451)
    at async Dd.resolve (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:141:1451)
    at async /home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:210:7249
    at async Ky (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:140:53910)
    at async ne (/home/jianglibo/.yarn/releases/yarn-4.1.1.cjs:210:7231)
    at async Promise.allSettled (index 4)

and:

➤ YN0007: │ core-js@npm:2.6.12 must be built because it never has been before or the last one failed
➤ YN0007: │ deasync@npm:0.1.23 must be built because it never has been before or the last one failed
➤ YN0009: │ deasync@npm:0.1.23 couldn't be built successfully (exit code 1, logs can be found here: /tmp/xfs-e1d2fa9e/build.log)
➤ YN0007: │ parcel-bundler@npm:1.12.5 must be built because it never has been before or the last one failed

# This file contains the result of Yarn building a package (deasync@npm:0.1.23)
# Script name: install

Usage Error: Couldn't find a script name "node-gyp" in the top-level (used by deasync@npm:0.1.23). This typically happens because some package depends on "node-gyp" to build itself, but didn't list it in their dependencies. To fix that, please run "yarn add node-gyp" into your top-level workspace. You also can open an issue on the repository of the specified package to suggest them to use an optional peer dependency.

Steps to run demos

The working step are as follows:

• go to the parent folder of demos, like ~/tfjs-models/pose-detection
• invoke yarn and yarn build, it will get ./dist folder ready.
• `echo ‘{}’ > ./dist/package.json, If not you may enconter the “Manifest not found” error
• go to ~/tfjs-models/pose-detection/demos/live_video
• yarn add node-gyp and yarn and yarn watch