app.py

import gradio as gr
from transformers import pipeline

pipe = pipeline(
    "text-generation",
    model="Simon0900/personalized-fitness-coach-JSON"
)


def respond(message, history, system_message, max_tokens, temperature, top_p):

    prompt = system_message.strip() + "\n\n"

    # Limit history (VERY important)
    history = history[-4:]

    for user_msg, bot_msg in history:
        prompt += f"User: {user_msg}\nAssistant: {bot_msg}\n"

    prompt += f"User: {message}\nAssistant:"

    result = pipe(
        prompt,
        max_new_tokens=min(max_tokens, 4096),  # prevent runaway generation
        temperature=temperature,
        top_p=top_p,
        do_sample=True,
        return_full_text=False,
        eos_token_id=pipe.tokenizer.eos_token_id,  # important stop signal
    )

    return result[0]["generated_text"]


chatbot = gr.ChatInterface(
    respond,
    additional_inputs=[
        gr.Textbox(value="""You are a fitness expert. You will create a workout plan in JSON-schema, based on the given user description. Strictly use the following format:\n\nJSON-schematic:\n{\n  \"goal\": <workout goal>,\n  \"intensity\": <intensity level>,\n  \"workout_equipment\": <workout equipment>,\n  \"workout_days\": <workout days>,\n  \"time_per_workout\": <time per workout>,\n  \"limitations\": <limitations>,\n  \"days\": [\n    {\n      \"day\": <day of week>,\n      \"focus\": <muscle groups>,\n      \"estimated_duration_min\": <estimated duration>,\n      \"warmup_exercise\": <warmup exercise>,\n      \"exercises\": [\n        {\n          \"name\": <name of exercise>,\n          \"muscle_group\": <muscle group>,\n          \"instructions\": <instructions>,\n          \"sets\": <number of sets>,\n          \"reps\": <number of reps>,\n          \"rest_seconds\": <rest duration>\n        }\n        OR\n        {\n          \"name\": <name of exercise>,\n          \"muscle_group\": \"cardio\",\n          \"instructions\": <instructions>,\n          \"duration_min\": <duration>\n        }\n      ]\n    }\n  ]\n}\n\nRules:\n- Warmup must differ from exercises\n- At least 3 exercises per day\n- No repeating exercises on consecutive days\n- Optimize for recovery and variation\n- Spread out the workout days over a week\n- Not every exercise has to use the equipment\n- Cardio exercises do not have to use the equipment\n- Respond only with valid JSON using double quotes\n
"""),
        gr.Slider(1, 4096, value=4096, step=1),
        gr.Slider(0.1, 2.0, value=0.7, step=0.1),
        gr.Slider(0.1, 1.0, value=0.95, step=0.05),
    ],
)

demo = chatbot

demo.launch()