brain.js problem with importing LSTM network from json

I think what might be going on is that what you’re passing into BrainJS is not actually JSON.

In your code, you have this:

fs.readFile('traindata.json', function(err, data) {
  if (err) throw err;
  net.fromJSON(data);
  console.log("file loaded");
});

When I tried running your code, I saw the same error you saw. Using JSON.parse() seemed to fix the issue.

In other words, when I changed net.fromJSON(data); to net.fromJSON(JSON.parse(data));, the error disappeared.

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