tf.io.loadWeights doesn't work with local file in nodejs

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TensorFlow.js version

tfjs 0.11.7 tfjs-node 0.1.7

Browser version

node v8.7.0

Describe the problem or feature request

Got the following error when trying to load local weights file:

(node:73865) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): ReferenceError: fetch is not defined

Code to reproduce the bug / link to feature request

const fs = require('fs');
const tf = require('@tensorflow/tfjs');
require('@tensorflow/tfjs-node');

(async function(){
    let manifest = JSON.parse(fs.readFileSync('weights.json'));
    let weights = await tf.io.loadWeights(manifest, 'file://./weights');
})();

[caisq]

This is now fixed in the latest release (0.2.1) of @tensorflow/tfjs-node and @tensorflow/tfjs-node-gpu

[ubertao]

@caisq The model was trained somewhere else, so far I only have access to the weights.