Each of the following get copied during "prepare" phase, which is on local NPM install (but not when a dependent package installs): https://docs.npmjs.com/misc/scripts
- tfjs-node/src => tfjs-node-gpu/src
- tfjs-node/binding => tfjs-node-gpu/binding
- tfjs-node/scripts => tfjs-node-gpu/scripts
- tfjs-node/binding.gyp => tfjs-node-gpu/binding.gyp
We do this with a copy because symlinks have the incorrect local directory structure.
This PR also fixes a bug where the node backend file caches the backend (this is incorrect behavior because it may switch out during unit tests or if there are accidentally 2 copies of tfjs-node as a dependency).
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Na Li