public bool DeleteLastSample(int index)
    {
        bool isDeleted = gr.deleteGestureSample(index, gr.getGestureNumberOfSamples(index) - 1);

        if (isDeleted)
        {
            gestureList[index].SampleCount--;
        }

        Debug.Log($"{gr.getGestureNumberOfSamples(index)}");

        return(isDeleted);
    }