gemma-2-2b-it-emotional-rlaif-dpo

Intended Use

This adapter is intended for research and experimentation with emotionally aligned dialogue generation. It should be loaded on top of the base Gemma 2 2B IT model using PEFT.

Model Details

• Base model: google/gemma-2-2b-it
• Adapter repository: mario-rc/gemma-2-2b-it-emotional-rlaif-dpo
• Adapter type: LoRA / PEFT
• Alignment method: DPO
• Training framework: LLaMA-Factory
• Prompt template: gemma
• Dataset: mario-rc/aif-emotional-generation

Training Procedure

Key hyperparameters:

• Learning rate: 5e-6
• Epochs: 1
• Scheduler: cosine
• Warmup ratio: 0.1
• Optimizer: AdamW (torch) with betas=(0.9, 0.999) and epsilon=1e-8

Framework Versions

• PEFT: 0.11.1
• Transformers: 4.45.2
• PyTorch: 2.6.0+cu124
• Datasets: 3.2.0
• Tokenizers: 0.20.3

Usage Example

python
Copy code
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel

base_model_id = "google/gemma-2-2b-it"
adapter_id = "mario-rc/gemma-2-2b-it-emotional-rlaif-dpo"

tokenizer = AutoTokenizer.from_pretrained(base_model_id)
model = AutoModelForCausalLM.from_pretrained(
    base_model_id,
    device_map="auto",
    torch_dtype=torch.bfloat16,
)
model = PeftModel.from_pretrained(model, adapter_id)
model.eval()

messages = [
    {"role": "user", "content": "I feel overwhelmed today. Can you respond with empathy?"}
]

inputs = tokenizer.apply_chat_template(
    messages,
    add_generation_prompt=True,
    return_tensors="pt",
).to(model.device)

with torch.no_grad():
    outputs = model.generate(
        inputs,
        max_new_tokens=256,
        do_sample=True,
        temperature=0.7,
        top_p=0.9,
    )

print(tokenizer.decode(outputs[0][inputs.shape[-1]:], skip_special_tokens=True))

How to Use

The following example loads this adapter and runs an interactive emotional dialogue loop. Use exit to stop the chat.

python
Copy code
import random
import sys

import torch
from peft import AutoPeftModelForCausalLM
from transformers import AutoTokenizer

MODEL_ID = "mario-rc/gemma-2-2b-it-emotional-rlaif-dpo"
MODEL_FAMILY = "gemma"  # "gemma" or "llama3"


def get_turn_markers(model_family):
    if model_family == "llama3":
        return {
            "bos": "<|begin_of_text|>",
            "user_start": "<|start_header_id|>user<|end_header_id|>\n\n",
            "model_start": "<|start_header_id|>assistant<|end_header_id|>\n\n",
            "turn_end": "<|eot_id|>",
        }
    return {
        "bos": "<bos>",
        "user_start": "<start_of_turn>user\n",
        "model_start": "<start_of_turn>model\n",
        "turn_end": "<end_of_turn>\n",
    }


def update_prompt(dialogues, model_family):
    """Build the prompt for the model based on the dialogue history."""
    markers = get_turn_markers(model_family)

    system = (
        f"{markers['bos']}You are an expert at creating dialogues.\n\n"
        "Dialogue and emotional structure:\n"
    )

    human_prompts = [d[0] for d in dialogues]
    chatbot_responses = [d[1] for d in dialogues]

    p_emo = [h[0] for h in human_prompts]
    p_utt = [h[1] for h in human_prompts]
    r1_utt = [c[1] for c in chatbot_responses]
    r2_emo = [c[2] for c in chatbot_responses]
    r2_utt = [c[3] for c in chatbot_responses]
    r3_utt = [c[5] for c in chatbot_responses]

    context = (
        "Human: (HAPPINESS) PROMPT.\n"
        "Chatbot: (HAPPINESS) RESPONSE_1. (HAPPINESS) RESPONSE_2. (NEUTRAL) RESPONSE_3.\n"
    )
    for p_e, _, _, r2_e, _, _ in zip(p_emo, p_utt, r1_utt, r2_emo, r2_utt, r3_utt):
        context += f"Human: ({p_e}) PROMPT.\n"
        context += f"Chatbot: ({p_e}) RESPONSE_1. ({r2_e}) RESPONSE_2. (NEUTRAL) RESPONSE_3.\n"
    context += "\n"

    rules = (
        "Dialogue rules:\n"
        "The response must be open-domain curated. The response should be coherent, empathetic, engaging and proactive.\n"
        "The chatbot RESPONSE is composed of 3 different sentences (RESPONSE_1, RESPONSE_2 and RESPONSE_3), separated by a period.\n"
        "Between RESPONSE_1, RESPONSE_2 and RESPONSE_3 should be a max length of 20-25 words.\n"
        "RESPONSE_3 must be open-ended to follow-up the conversation, so the Human is encouraged to answer with a full long sentence. Avoid yes/no questions.\n\n"
        "Emotional response rules:\n"
        f"RESPONSE_1 must contain a {p_emo[-1]} tone.\n"
        f"RESPONSE_2 must contain a {r2_emo[-1]} tone.\n"
        "RESPONSE_3 must contain a NEUTRAL tone.\n\n"
        "Answer in a single turn to Human. Follow exactly the emotional structure and the emotional and dialogue rules."
        f"{markers['user_start']}"
    )

    completion = ""
    for idx, (p_e, p_u, r1_u, r2_e, r2_u, r3_u) in enumerate(zip(p_emo, p_utt, r1_utt, r2_emo, r2_utt, r3_utt)):
        completion += f"({p_e}) {p_u}{markers['turn_end']}{markers['model_start']}"
        if idx != len(p_emo) - 1:
            completion += f"({p_e}) {r1_u} ({r2_e}) {r2_u} (NEUTRAL) {r3_u}{markers['turn_end']}{markers['user_start']}"

    return system + context + rules + completion


class Chatbot:
    def __init__(self, dialogue_language="es"):
        self.dialogue_language = dialogue_language
        self.device = "cuda" if torch.cuda.is_available() else "cpu"

        self.tokenizer = AutoTokenizer.from_pretrained(MODEL_ID, trust_remote_code=True)
        self.model = AutoPeftModelForCausalLM.from_pretrained(
            MODEL_ID,
            torch_dtype=torch.bfloat16 if torch.cuda.is_available() else torch.float32,
            device_map="auto" if torch.cuda.is_available() else None,
            trust_remote_code=True,
        )
        if not torch.cuda.is_available():
            self.model = self.model.to(self.device)
        self.model.eval()

    @staticmethod
    def split_emo_chatbot(sentence):
        """Extract emotions and utterances from a chatbot response."""
        response_pos_ini = [i for i, c in enumerate(sentence) if c == "("]
        response_pos_end = [i for i, c in enumerate(sentence) if c == ")"]
        response_r1_utt = sentence[response_pos_end[0] + 2:response_pos_ini[1]].strip()
        response_r2_utt = sentence[response_pos_end[1] + 2:response_pos_ini[2]].strip()
        response_r3_utt = sentence[response_pos_end[2] + 2:].lstrip()
        return response_r1_utt, response_r2_utt, response_r3_utt

    def select_dialogue(self, dialogue_language):
        """Return a list of example dialogues for the given language."""
        if dialogue_language == "en":
            dialogue_base = [
                [["HAPPINESS", "Hi, who are you?"],
                 ["HAPPINESS", "Hi! I'm Ray, a social personal assistant robot with emotions.", "HAPPINESS", "I'm here to chat with you about anything you'd like.", "NEUTRAL", "What would you like to talk about?"]],
                [["HAPPINESS", "I'm interested in talking about you, tell me more."],
                 ["HAPPINESS", "Great! I'm glad you want to get to know me!", "NEUTRAL", "I'm designed to help and talk with people about any topic.", "NEUTRAL", "I can talk about science, technology, history, or just have a pleasant conversation. What interests you?"]],
            ]
            dialogue = [
                [["HAPPINESS", "Nice to meet you, Ray. I'd like to know more about you."],
                 ["HAPPINESS", "The pleasure is mine!", "HAPPINESS", "I'm a chatbot designed to chat and learn with you.", "NEUTRAL", "Would you like to talk about a specific topic?"]],
                [["HAPPINESS", "I love talking to you, you're very interesting."],
                 ["HAPPINESS", "That's so nice to hear! I'm glad you enjoy talking to me.", "NEUTRAL", "I'm designed to have meaningful and empathetic conversations.", "NEUTRAL", "Would you like to talk about emotions, artificial intelligence, or something more personal?"]],
            ]
        else:
            dialogue_base = [
                [["HAPPINESS", "Hola, ¿quién eres?"],
                 ["HAPPINESS", "¡Hola! Soy Ray y soy un robot social asistente personal con emociones.", "HAPPINESS", "Estoy aquí para charlar contigo sobre cualquier tema.", "NEUTRAL", "¿Sobre qué te gustaría hablar?"]],
                [["HAPPINESS", "Me interesa hablar sobre ti, cuéntame más detalles."],
                 ["HAPPINESS", "¡Genial, me encanta que quieras conocerme!", "NEUTRAL", "Estoy diseñado para ayudar y hablar con la gente sobre cualquier tema.", "NEUTRAL", "Puedo hablar de ciencia, tecnología, historia o simplemente tener una charla amena. ¿Qué te interesa?"]],
            ]
            dialogue = [
                [["HAPPINESS", "Mucho gusto, Ray. Me gustaría saber más sobre ti."],
                 ["HAPPINESS", "¡El gusto es mío!", "HAPPINESS", "Soy un chatbot diseñado para conversar y aprender contigo.", "NEUTRAL", "¿Quieres hablar de algún tema en específico?"]],
                [["HAPPINESS", "Me encanta hablar contigo, eres muy interesante."],
                 ["HAPPINESS", "¡Qué lindo escuchar eso! Me alegra que disfrutes hablar conmigo.", "NEUTRAL", "Estoy diseñado para tener conversaciones significativas y empáticas.", "NEUTRAL", "¿Te gustaría que hablemos sobre emociones, inteligencia artificial, o algo más personal?"]],
            ]
        return dialogue_base + dialogue

    def chat_with_model(self, dialogues, max_new_tokens=96):
        prompt_text = update_prompt(dialogues, MODEL_FAMILY)
        inputs = self.tokenizer(prompt_text, return_tensors="pt").to(self.model.device)
        with torch.no_grad():
            outputs = self.model.generate(
                **inputs,
                max_new_tokens=max_new_tokens,
                do_sample=True,
                temperature=0.7,
                top_p=0.9,
                eos_token_id=self.tokenizer.eos_token_id,
            )
        generated = outputs[0][inputs["input_ids"].shape[-1]:]
        response = self.tokenizer.decode(generated, skip_special_tokens=True).splitlines()[0].strip()
        print("Response:", response, "\n")
        return response

    def main(self):
        emotions = ["ANGER", "FEAR", "SADNESS", "DISGUST", "HAPPINESS", "SURPRISE", "NEUTRAL"]
        dialogue = self.select_dialogue(self.dialogue_language)

        while True:
            if len(dialogue) > 7:
                dialogue.pop(2)

            p_emo = random.choice(emotions)
            user_sentence = input(f"Enter your sentence: ({p_emo}) ")
            if user_sentence.strip().lower() == "exit":
                break

            r2_emo = random.choice(emotions)
            dialogue.append([[p_emo, user_sentence], [p_emo, "", r2_emo, "", "NEUTRAL", ""]])
            response = self.chat_with_model(dialogue)

            try:
                r1_utt, r2_utt, r3_utt = self.split_emo_chatbot(response)
            except Exception:
                if self.dialogue_language == "en":
                    r1_utt, r2_utt, r3_utt = "I'm sorry.", "I didn't understand you.", "Could you repeat?"
                else:
                    r1_utt, r2_utt, r3_utt = "Lo siento.", "No te he entendido.", "¿Podrías repetirme?"

            dialogue[-1][1] = [p_emo, r1_utt, r2_emo, r2_utt, "NEUTRAL", r3_utt]


if __name__ == "__main__":
    language = sys.argv[1] if len(sys.argv) > 1 else "en"
    chatbot = Chatbot(dialogue_language=language)
    chatbot.main()

Limitations

This is an adapter, not a standalone full model. It requires access to the base model and should be evaluated for the target deployment setting before use. The model may still produce incorrect, biased, unsafe, or emotionally inappropriate responses.

Usage is subject to the license and terms of the base Gemma 2 model.