Hugging Face Transformers
It is a popular open-source python library. It provides easy access to thousands of pre-trained models to do inference and training.
Pipeline
It is the most convenient way to inference with a pretrained model
from transformers import pipeline, infer_device
device = infer_device() # infer_device() can automatically detect an available accelerator for inference
text_generator = pipeline("text-generation", model="meta-llama/Llama-2-7b-hf", device=device)