gpuDeltaWeight
============================

.. js:function:: FullyConnectedLayer.gpuDeltaWeight()

    GPUによるδweightの計算

    .. math::

        \delta weight_{i,j} = \delta z_{i} \cdot x_{j}

ソース
^^^^^^

.. code-block:: js

            gpuDeltaWeight(){
                var vertex_shader = Shaders.FullyConnectedLayer_DeltaWeight;
    
                var prev_layer = this.prevLayer;
    
                var vertex_shader = vertex_shader
                    .replace(/miniBatchSize/g, miniBatchSize.toString())
                    .replace(/WeightColSize/g, prev_layer.unitSize.toString());
    
                var param_id = "Fully-Connected-Layer-delta-weight," + miniBatchSize + "," + prev_layer.unitSize + "," + this.unitSize;
                if (this.params[param_id] == undefined){
    
                    this.params[param_id] = {
                        id : param_id,
                        vertexShader: vertex_shader,
                        args : {
                            "zero": new Float32Array(this.deltaWeight.dt.length),
                            "prev_y": makeTextureInfo(WebGL2, "float", new ArrayView(miniBatchSize, prev_layer.unitSize)),
                            "deltaZ": makeTextureInfo(WebGL2, "float", this.deltaZ),
                            "deltaWeight" : this.deltaWeight.dt
                        }
                    };
                }
    
                var param = this.params[param_id];
    
                param.args["prev_y"].value = prev_layer.y_.dt;;
                param.args["deltaZ"].value = this.deltaZ.dt;
                param.args["deltaWeight"].value = this.deltaWeight.dt;
    
                WebGL2.compute(param);
            }