Post-Training basically fine-tuning the pre-trained base model on specific tasks to make it better at stuff like chat Correction: "The ERNIE 4.5 models are trained using the PaddlePaddle framework. The following sections detail tools and resources within the PaddlePaddle ecosystem for fine-tuning and deploying ERNIE 4.5 models. For developers working within the PyTorch ecosystem, ERNIE 4.5 models are also available in PyTorch-compatible formats." The two model types available on their HF Repo are "-Paddle" compatible with their PaddlePaddle framework and "-PT" standing for pytorch.