---
license: mit
tags:
- molecular-property-prediction
- graph-neural-network
- chemistry
- pytorch
- molecular-dynamics
- force-fields
datasets:
- qm9
- spice
- pfas
metrics:
- mse
- mae
pipeline_tag: graph-ml
library_name: moml
---

# MoML-CA: Molecular Machine Learning for Coarse-grained Applications

This repository contains the **DJMGNN** (Dense Jump Multi-Graph Neural Network) models from the MoML-CA project, designed for molecular property prediction and coarse-grained molecular modeling applications.

## 🚀 Models Available

### 1. Base Model (`base_model/`)
- **Pre-trained DJMGNN** model trained on multiple molecular datasets
- **Datasets**: QM9, SPICE, PFAS
- **Task**: General molecular property prediction
- **Use case**: Starting point for transfer learning or direct molecular property prediction

### 2. Fine-tuned Model (`finetuned_model/`)
- **PFAS-specialized DJMGNN** model fine-tuned for PFAS molecular properties
- **Base**: Built upon the base model
- **Specialization**: Per- and polyfluoroalkyl substances (PFAS)
- **Use case**: Optimized for PFAS molecular property prediction

## 🏗️ Architecture

**DJMGNN** (Dense Jump Multi-Graph Neural Network) features:
- **Multi-task learning**: Simultaneous node-level and graph-level predictions
- **Jump connections**: Enhanced information flow between layers
- **Dense blocks**: Improved gradient flow and feature reuse
- **Supernode aggregation**: Global graph representation
- **RBF features**: Radial basis function encoding for distance information

### Architecture Details
- **Hidden Dimensions**: 128
- **Number of Blocks**: 3-4
- **Layers per Block**: 6
- **Input Node Dimensions**: 11-29 (depending on featurization)
- **Node Output Dimensions**: 3 (forces/properties per atom)
- **Graph Output Dimensions**: 19 (molecular descriptors)
- **Energy Output Dimensions**: 1 (total energy)

## 📊 Training Details

### Datasets
- **QM9**: ~130k small organic molecules with quantum mechanical properties
- **SPICE**: Molecular dynamics trajectories with forces and energies
- **PFAS**: Per- and polyfluoroalkyl substances dataset with specialized descriptors

### Training Configuration
- **Optimizer**: Adam
- **Learning Rate**: 3e-5 (fine-tuning), 1e-3 (base training)
- **Batch Size**: 4-8 (node tasks), 8-32 (graph tasks)
- **Loss Functions**: MSE for regression, weighted multi-task loss
- **Regularization**: Dropout (0.2), gradient clipping

## 🔧 Usage

### Loading the Base Model

```python
import torch
from moml.models.mgnn.djmgnn import DJMGNN

# Initialize model architecture
model = DJMGNN(
    in_node_dim=29,  # Adjust based on your featurization
    in_edge_dim=0,
    hidden_dim=128,
    n_blocks=4,
    layers_per_block=6,
    node_output_dims=3,
    graph_output_dims=19,
    energy_output_dims=1,
    jk_mode="attention",
    dropout=0.2,
    use_supernode=True,
    use_rbf=True,
    rbf_K=32
)

# Load base model checkpoint
checkpoint = torch.hub.load_state_dict_from_url(
    "https://huggingface.co/saketh11/MoML-CA/resolve/main/base_model/pytorch_model.pt"
)
model.load_state_dict(checkpoint["model_state_dict"])
model.eval()
```

### Loading the Fine-tuned Model

```python
# Same architecture setup as above, then:
checkpoint = torch.hub.load_state_dict_from_url(
    "https://huggingface.co/saketh11/MoML-CA/resolve/main/finetuned_model/pytorch_model.pt"
)
model.load_state_dict(checkpoint["model_state_dict"])
model.eval()
```

### Making Predictions

```python
# Assuming you have a molecular graph 'data' (torch_geometric.data.Data)
with torch.no_grad():
    output = model(
        x=data.x,
        edge_index=data.edge_index,
        edge_attr=data.edge_attr,
        batch=data.batch
    )
    
    # Extract predictions
    node_predictions = output["node_pred"]      # Per-atom properties/forces
    graph_predictions = output["graph_pred"]    # Molecular descriptors
    energy_predictions = output["energy_pred"]  # Total energy
```

## 📈 Performance

### Base Model
- Trained on diverse molecular datasets for robust generalization
- Multi-task learning across node and graph-level properties
- Suitable for transfer learning to specialized domains

### Fine-tuned Model
- Specialized for PFAS molecular properties
- Improved accuracy on fluorinated compounds
- Optimized for environmental and toxicological applications

## 🔬 Applications

- **Molecular Property Prediction**: HOMO/LUMO, dipole moments, polarizability
- **Force Field Development**: Atomic forces and energies for MD simulations
- **Environmental Chemistry**: PFAS behavior and properties
- **Drug Discovery**: Molecular screening and optimization
- **Materials Science**: Polymer and surface properties

## 🔗 Links

- **GitHub Repository**: [SAKETH11111/MoML-CA](https://github.com/SAKETH11111/MoML-CA)
- **Documentation**: See repository README and docs/
- **Issues**: Report bugs and request features on GitHub

## 📄 License

This project is licensed under the MIT License. See the LICENSE file for details.

## 👥 Contributing

Contributions are welcome! Please see the contributing guidelines in the GitHub repository.

---

*For questions or support, please open an issue in the [GitHub repository](https://github.com/SAKETH11111/MoML-CA).*