from transformers import AutoTokenizer, AutoModelForSeq2SeqLM
tokenizer = AutoTokenizer.from_pretrained("bigscience/T0_3B")
model = AutoModelForSeq2SeqLM.from_pretrained("bigscience/T0_3B")

Save your files to a specified directory with [PreTrainedModel.save_pretrained]:

tokenizer.save_pretrained("./your/path/bigscience_t0")
model.save_pretrained("./your/path/bigscience_t0")

Now when you're offline, reload your files with [PreTrainedModel.from_pretrained] from the specified directory: