function preprocess(imageData) {
        const {
            width,
            height,
            data
    } = imageData;
        const dataTensor = ndarray(new Float32Array(data), [width, height, 4])
        
        const dataProcessedTensor = ndarray(new Float32Array(width * height * 3), [width, height, 3])
        //[0,255][0,1]
        ops.divseq(dataTensor, 255)
        //R
        ops.assign(dataProcessedTensor.pick(null, null, 0), dataTensor.pick(null, null, 0))
        //G
        ops.assign(dataProcessedTensor.pick(null, null, 1), dataTensor.pick(null, null, 1))
        //B
        ops.assign(dataProcessedTensor.pick(null, null, 2), dataTensor.pick(null, null, 2))
        const preprocessedData = dataProcessedTensor.data;
        console.log("via process");
        return preprocessedData;
    }