Train imported model from JSON fails

Trying to train an imported model from JSON fails.

Use case:

 let net = new LSTM();
      const trainingData = [
        {
          input: 'hi',
          output: 'mom',
        },
        {
          input: 'howdy',
          output: 'dad',
        },
        {
          input: 'hello',
          output: 'sis',
        },
        {
          input: 'yo',
          output: 'bro',
        },
      ];
      net.train(trainingData, { iterations: 20 });

      const net2 = new LSTM().fromJSON(net.toJSON());
      net2.train(trainingData, { iterations: 20 });
      net2.run('hi');

Error:

Error: Network error rate is unexpected NaN, check network configurations and try again.
 Most probably input format is not correct or training data is not enough. 

    at LSTM.train (brain.js\src\recurrent\rnn.ts:628:15)

Fix: Setting dataFormatter.isSetup to true in DataFormatter.fromJSON solve the problem

    dataFormatter.isSetup = true;

So is there any drawback for this Fix ?

[cpgb85]

Thanks for reproducing. I’ll look at this early this week.

Any progress on figuring this out? This is pretty much useless without being able to save a previous network.

[robertleeplummerjr]

Thanks for reproducing. I’ll look at this early this week.