code_MEGAPOLI_Foundation_Model

• code_MEGAPOLI_Foundation_Model
  • Introduction
  • Scripts and Data
    • Prerequisite
    • Scripts
    • Data
    • Model
  • Acknowledgments

Introduction

This repository is a supplementary to the manuscript "Integrating Simulations and Observations: A Foundation Model for Estimating Aerosol Mixing State Index"

The objective of this project are:

• Pre-train a foundation model for aerosol mixing state prediction using PartMC-MOSAIC simulation data.
• Fine-tune the pre-trained foundation model with MEGAPOLI observational data.
• Analyze the impact of data scarcity on the performance of the fine-tuned model and input feature importance.

Scripts and Data

Prerequisite

• If you do not have the "conda" system

# Download and install conda
$ wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
$ chmod +x Miniconda3-latest-Linux-x86_64.sh
$ ./Miniconda3-latest-Linux-x86_64.sh
# Edit .bash_profile or .bashrc
PATH=$PATH:$HOME/.local/bin:$HOME/bin:$HOME/miniconda3/bin
# Activate the conda system
$source .bash_profile
# OR source .bashrc

• Create and activate your own conda environment

# Create an environment "partmc" and install the necessary packages
conda env create -f environment.yml
# Activate the "partmc" environment
conda activate partmc

Scripts

Tasks	Folders	Fig or Tab in paper
PartMC data extract	0_PartMC_data_extract
Pre-trained foundation model hyperparameter	1_Pre_trained_foundation_model_hyperparameter hyperparameter
Pre-trained foundation model development	2_Pre_train_Foundation_model
Fine-tuned foundation model development (various fine-tuning training data size)	3_Fine_tune_different_data_size
Fine-tuned foundation model development (various input feature size)	4_Fine_tune_different_input_feature_size
Data analysis	5_Figure_plot

Data

• PartMC data

Folder	Comments	How to get it?
PartMC_train.csv	PartMC simulation training data for pre-trained foundation model	Raw Partmc Data and Pre_train_Foundation_model.ipynb
PartMC_valid.csv	PartMC simulation validation data for pre-trained foundation model	Raw Partmc Data and Pre_train_Foundation_model.ipynb
PartMC_test.csv	PartMC simulation testing data for pre-trained foundation model	Raw Partmc Data and Pre_train_Foundation_model.ipynb

• MEGAPOLI data: MEGAPOLI observational data will be made available on request.

• Fine_tuned_Results_different_data_szie

Folder	Comments	How to get it?
Fine_tuning_XX%Data.csv	Chi estimation results from fine-tuned foundation model, here XX means training dataset is XX fraction of total MEGAPOLI data (XX *2 fraction of fine-tuning training dataset)	Fine-tune_different_data_size.ipynb
AutoML_XX%Data.csv	Chi estimation results from AutoML, here XX means training dataset is XX fraction of total MEGAPOLI data (XX *2 fraction of fine-tuning training dataset)	AutoML.ipynb
LR_XX%Data.csv	Chi estimation results from Linear regression, here XX means training dataset is XX fraction of total MEGAPOLI data (XX *2 fraction of fine-tuning training dataset)	LR.ipynb

• Fine_tuned_Results_different_input_feature

Folder	Comments	How to get it?
Fine_tuning_DropAero_Data.csv	Input feature drop aerosol subset	Fine-tune_different_input_size.ipynb
Fine_tuning_DropAllGas_Data.csv	Input feature drop Non-VOC and VOC gases subset	Fine-tune_different_input_size.ipynb
Fine_tuning_DropEnv_Data.csv	Input feature drop environment subset	Fine-tune_different_input_size.ipynb
Fine_tuning_DropNonVOC_Data.csv	Input feature drop Non-VOC gases subset	Fine-tune_different_input_size.ipynb
Fine_tuning_DropVOC_Data.csv	Input feature drop VOC gases subset	Fine-tune_different_input_size.ipynb
Fine_tuning_onlyAero_Data.csv	Input feature only consider aerosol subset	Fine-tune_different_input_size.ipynb

Model

Folder	Comments	How to get it?
Foundation_Model.pth	Foundation model pre-trained by PartMC simulation data	Pre_train_Foundation_model.ipynb
best_resnet_model_finetuned_XX%.pth	Fine-tuned foundation model, here XX means training dataset is XX fraction of total MEGAPOLI data (XX *2 fraction of fine-tuning training dataset)	Fine-tune_different_data_size.ipynb
best_resnet_model_finetuned_50%_XX_xxxx.csv	Fine-tuned foundation model, here XX means input feature size and xxxx means input feature subset combination	Fine-tune_different_input_size.ipynb
AutoML_XX%Data.csv	Model trained and selected by AutoML, here XX means training dataset is XX fraction of total MEGAPOLI data (XX *2 fraction of fine-tuning training dataset)	AutoML.ipynb

Acknowledgments

• This work made use of the facilities of the N8 Centre of Excellence in Computationally Intensive Research (N8 CIR) provided and funded by the N8 research partnership and EPSRC (Grant No. EP/T022167/1). The Centre is co-ordinated by the Universities of Durham, Manchester and York.
• The authors acknowledge the assistance given by Research IT and Computational Shared Facility 3 (CSF3) at The University of Manchester.
• Z.Z. appreciates the support provided by the academic start-up funds from the Department of Earth and Environmental Sciences at The University of Manchester. The authors declare no conflict of interest.