StressNet

This repository contains codes and data required to generate deep learning formulations of transpiration stress using Tensorflow.

Author: Akash Koppa

Contact: akash.koppa@ugent.be

System Requirements

Operating System (OS): Linux, MacOS, Windows.

Software: conda (version > 4.0) - Anaconda, Miniconda or anyother virtual environment.

Optional Software: CUDA to use GPU support (Please consult the relevant instructions from NVIDIA for specific operating systems and graphics cards).

StressNet has been tested on the following specifications:

Operating System:    Elementary OS 6.1 (Jólnir) 
                     (Based on Ubuntu 20.04.3 LTS)
Linux Kernel:        Linux Kernel 5.13.0-25-generic
Processor (CPU):     AMD Ryzen threadripper 3960x 24-core
Memory:              128gb
Graphics Card (GPU): NVIDIA GeForce RTX 2070 Super
NOTE: GPU is optional.

Installation Guide

The commands in this installation guide is based on the Linux-based OS. Similar commands can be used in MacOS (terminal) or Windows (Anaconda terminal). The following commands should be entered in the terminal.

Create a conda environment and activate it.

conda create --name stressnet
conda activate stressnet

Install the required packages and libraries

conda install pip
pip install -- upgrade tensorflow
pip install pandas
pip install tables
pip install matplotlib

Typical install time: ~30 minutes for all the packages.

NOTE: Resource for installing tensorflow including activating GPU support can be found in: https://www.tensorflow.org/install/

Demo Guide

The files in the demo folder demonstrates the training of the stressnet for a subset of the data used in the research article (details in the usage guide). The folder consists of the following files:

train_demo.py: this is the main python script which consists of the code to train a deep neural net (stressnet) for the given input data.
stressnet_functions.py: contains functions to preprocess the input data into a format amenable to tensorflow, the Kling-Gupta efficiency (KGE) loss function, and the deep learning architecture of the stressnet.
input folder: containing the input files required for training the StressNet.

NOTES:

Please use the train_demo.py script to test the code. The code is well-commented and the sequence of steps required to create the StressNet is logically designed.
Any changes to the hyperparameters or the input data configurations can be done in the stressnet_functions.py script.

Expected Outcome: 1) A deep learning model based on the input data. 2) A graph showing the evolution of the training process in terms of the changes in the loss function (KGE in this case).

Expected Run Time: ~45 min.

Usage Guide

The python scripts used to generate the final StressNet formulations of transpiration stress for tall (train_tall_vegetation.py) and short (train_short_vegetation.py) vegetation (presented in the research article) alongwith the entire dataset is in the stressnet folder. The usage is similar to the demo file.
The final trained StressNet formulations for both tall and short vegetation are present in hybrid_paper/trained_stressnet folder
The expected runtime for training both the tall and short vegetation is ~3 hours.

Reference

Koppa, A., Rains, D., Hulsman, P., Poyatos, R., and Miralles, D. G. A deep learning-based hybrid model of global terrestrial evaporation. Nature Communications 13, 1912 (2022). https://doi.org/10.1038/s41467-022-29543-7

Description: A version of StressNet for tall and short vegetation has been combined with a process-based model - Global Land Evaporation Amsterdam Model (GLEAM) - to create a hybrid model of global terrestrial evaporation. The resulting deep learning formulations and the hybrid model are detailed in the published research article.