TWM: Multimodal data generation engine via Traffic World Model

The code is structured into two subdirectories, image_code and video_code, which respectively hold the full implementation of data generation, preprocessing, model training, inference and evaluation for the image and video modalities, with each subdirectory equipped with a separate README file that provides detailed environment setup and usage instructions. The runtime environment for this code is configured with Python 3.10, torch==2.6.0+cu126, and torchvision==0.21.0+cu126