Brain.js：TypeError：无法读取未定义的属性“ runInput”

Question

我安装了 brain.js 的最新版本（1.2.4），并且我已经从github页面上尝试了example：

const brain = require('brain.js');

var net = new brain.recurrent.LSTMTimeStep();

net.train([
  [1, 3],
  [2, 2],
  [3, 1],
]);

var output = net.run([[1, 3], [2, 2]]);  // [3, 1]

运行时出现此错误：

  

TypeError：无法读取未定义的属性'runInput'

这是完整的堆栈：

C:\Users\***\Documents\node\ml\node_modules\brain.js\dist\recurrent\rnn-time-step.js:175

var outputMatrix = model.equations[i].runInput([input[i]]);
                                      ^      

TypeError: Cannot read property 'runInput' of undefined
at LSTMTimeStep.run (C:\Users\***\Documents\node\ml\node_modules\brain.js\dist\recurrent\rnn-time-step.js:175:49)
at Object.<anonymous> (C:\Users\***\Documents\node\ml\index.js:11:18)
at Module._compile (module.js:662:30)
at Object.Module._extensions..js (module.js:673:10)
at Module.load (module.js:575:32)
at tryModuleLoad (module.js:515:12)
at Function.Module._load (module.js:507:3)
at Function.Module.runMain (module.js:703:10)
at startup (bootstrap_node.js:193:16)
at bootstrap_node.js:660:3