Small Sample Size Back-propagation neural networks 1 Biogeochemistry 1 Biological materials 1 China 1 Core components 1 Digital soil mapping 1 Digital soil mappings 1 Economic loss 1 Electric submersible pumps 1 Extraction 1 Fault prediction 1 Feature extraction 1 Features extraction 1 Forecasting 1 Guangdong 1 Losses 1 Mapping 1 Model method 1 Model samples 1 Modelling method 1 Neural networks 1 Offshore oil fields 1 Offshore oil well production 1 Offshore oil wells 1 Oil-production 1 Optimal combination 1 Organic compounds 1 Probability distributions 1 Probability: distributions 1