from transformers import AutoTokenizer
tokenizer = AutoTokenizer.from_pretrained("HuggingFaceTB/SmolLM3-3B")

text = "Hello world"
tokens = tokenizer(text)

print(tokens["input_ids"])
# [9906, 1917]

print(tokenizer.convert_ids_to_tokens(tokens["input_ids"]))
# ['Hello', 'Ġworld']