from datasets import load_dataset

dataset = load_dataset("empgces/torre_de_belem")

def formatting_prompts_func(examples):
    convos = examples["conversations"]
    texts = [
        tokenizer.apply_chat_template(
            convo,
            tokenize=False,
            add_generation_prompt=False
        ).removeprefix("<bos>")
        for convo in convos
    ]
    return {"text": texts}

dataset = dataset.map(formatting_prompts_func, batched=True)

train_dataset = dataset["train"]
eval_dataset = dataset["validation"]