cpuDeltaZ
==================

.. js:function:: AffineTransformationLayer.cpuDeltaZ()

    CPUによるδzの計算

ソース
^^^^^^

.. code-block:: js

            cpuDeltaZ(){
    
                // 活性化関数
                switch(this.activationFunction){
                case ActivationFunction.none:
                    for (var i = 0; i < this.deltaZ.dt.length; i++) {
                        this.deltaZ.dt[i] = this.deltaY.dt[i];
                    }
                    break;
    
                case ActivationFunction.sigmoid:
                    for (var i = 0; i < this.deltaZ.dt.length; i++) {
                        this.deltaZ.dt[i] = this.deltaY.dt[i] * sigmoid_prime(this.z_.dt[i]);
                    }
                    break;
    
                case ActivationFunction.ReLU:
                    for (var i = 0; i < this.deltaZ.dt.length; i++) {
                        this.deltaZ.dt[i] = (this.z_.dt[i] <= 0 ? 0 : this.deltaY.dt[i]);
                    }
                    break;
                }
            }