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

.. js:function:: ConvolutionalLayer.gpuDeltaWeight() 

    GPUによるδweightの計算

ソース
^^^^^^

.. code-block:: js

            gpuDeltaWeight() {
                var prev_layer = this.prevLayer;
    
                var param_id = "ConvolutionalLayer-dabla-weight:" + this.filterSize + ":" + prev_layer.numChannels + ":" + this.numChannels + ":" + this.numRows + ":" + this.numCols + ":" + miniBatchSize;
    
                if (this.params[param_id] == undefined) {
    
                    var shader_src = Shaders.ConvolutionalLayer_DeltaWeights
                        .replace(/miniBatchSize/g, miniBatchSize.toString() + "u")
                        .replace(/numChannels/g, this.numChannels.toString() + "u")
                        .replace(/prevNumChannels/g, prev_layer.numChannels.toString() + "u")
                        .replace(/numRows/g, this.numRows.toString() + "u")
                        .replace(/numCols/g, this.numCols.toString() + "u")
                        .replace(/filterSize/g, this.filterSize.toString() + "u");
    
                    this.params[param_id]  = {
                        id : param_id,
                        vertexShader: shader_src,
                        args : {
                            "zero": new Float32Array(this.weight.dt.length),
                            "prev_y": makeTextureInfo(WebGL2, "float", new ArrayView(miniBatchSize * prev_layer.numChannels, prev_layer.numRows, prev_layer.numCols)),
                            "delta_z": makeTextureInfo(WebGL2, "float", new ArrayView(miniBatchSize * this.numChannels, this.numRows, this.numCols)),
                            "delta_w": this.deltaWeight.dt
                        }
                    };
                }
    
                var param = this.params[param_id];
    
                param.args["prev_y"].value = prev_layer.y_.dt;
                param.args["delta_z"].value = this.deltaZ.dt;
                WebGL2.compute(param);
            }