6G-IoT 6g-IoT Acetone Benchmarking Constrained optimization Convolution Convolutional neural network Data handling Electronic nose Gas detectors Gas sensor arrays Gas-sensors Gases Internet of things Learning algorithms Machine learning Mean square error Pattern recognition Performance Sensor elements Sixth-generation wireless communication technology (6g) Spatial augmentation Wireless communication technology Zero padding artificial intelligence convolutional neural networks electronic nose gas sensor array machine learning pattern recognition