Method _initialize

src/neural-network.js:95–128

* * Expects this.sizes to have been set

()

   * Expects this.sizes to have been set
   */
  _initialize() {
    if (!this.sizes) throw new Error ('Sizes must be set before initializing');

    this.outputLayer = this.sizes.length - 1;
    this.biases = []; // weights for bias nodes
    this.weights = [];
    this.outputs = [];

    // state for training
    this.deltas = [];
    this.changes = []; // for momentum
    this.errors = [];

    for (let layer = 0; layer <= this.outputLayer; layer++) {
      let size = this.sizes[layer];
      this.deltas[layer] = zeros(size);
      this.errors[layer] = zeros(size);
      this.outputs[layer] = zeros(size);

      if (layer > 0) {
        this.biases[layer] = randos(size);
        this.weights[layer] = new Array(size);
        this.changes[layer] = new Array(size);

        for (let node = 0; node < size; node++) {
          let prevSize = this.sizes[layer - 1];
          this.weights[layer][node] = randos(prevSize);
          this.changes[layer][node] = zeros(prevSize);
        }
      }
    }

    this.setActivation();
  }

  /**
   *