backpropagation
==============================

.. js:function:: FullyConnectedLayer.backpropagation() 

    誤差逆伝播

ソース
^^^^^^

.. code-block:: js

            backpropagation() {
                var lap = new Lap(this.backwardTime);
    
                if (this.nextLayer) {
                    // 最後のレイヤーでない場合
    
                    this.deltaY = this.nextLayer.deltaX;
                }
    
                this.cpuDeltaZ();
    
                lap.Time();
    
                this.deltaBias = this.deltaZ.Reduce((x, y) => x + y);
                lap.Time();
    
                this.gpuDeltaWeight();
                lap.Time();
    
                if(! (this.prevLayer instanceof InputLayer)){
    
                    this.gpuDeltaX();
                    if(Math_random() < 0.01){
    
                        var gpu_delta_x = new Float32Array(this.deltaX.dt);
                        this.cpuDeltaX();
    
                        var diff = this.deltaX.diff(gpu_delta_x);
    //                    Assert(diff < 0.01, "delta-X");
                        if(0.01 < diff){
                            console.log("dense delta-X %f", diff)
                        }
                    }
                }
                lap.Time();
            }