tokenizer = M2M100Tokenizer.from_pretrained("facebook/m2m100_418M", src_lang="zh")
model = M2M100ForConditionalGeneration.from_pretrained("facebook/m2m100_418M")

Tokenize the text:

encoded_zh = tokenizer(chinese_text, return_tensors="pt")

M2M100 forces the target language id as the first generated token to translate to the target language.