import gradio as gr
from transformers import GPT2Tokenizer, GPT2LMHeadModel

# Load the model and tokenizer
model_name = "migueldeguzmandev/GPT2XL_RLLMv3-PTT-10"
tokenizer = GPT2Tokenizer.from_pretrained(model_name)
model = GPT2LMHeadModel.from_pretrained(model_name)

# Set the pad token ID to the EOS token ID
model.config.pad_token_id = model.config.eos_token_id

# Define the inference function
def generate_response(input_text, temperature):
    # Tokenize the input text
    inputs = tokenizer(input_text, return_tensors="pt")
    input_ids = inputs["input_ids"]
    attention_mask = inputs["attention_mask"]

    # Generate the model's response
    output = model.generate(
        input_ids,
        attention_mask=attention_mask,
        max_length=300,
        num_return_sequences=1,
        temperature=temperature,
        no_repeat_ngram_size=2,
        top_k=50,
        top_p=0.95,
        do_sample=True,  # Set do_sample to True when using temperature
    )

    response = tokenizer.decode(output[0], skip_special_tokens=True)
    
    start_index = len(input_text)
    answer_text = response[start_index:]
        
    stopping_phrase = "Thank you for your question, Glad to be of service."
    stop_index = answer_text.find(stopping_phrase)
        
    if stop_index != -1:
        # Include the stopping phrase in the final answer
        stop_index += len(stopping_phrase)
        answer_text = answer_text[:stop_index]
        
    return answer_text

# Create the Gradio interface
interface = gr.Interface(
    fn=generate_response,
    inputs=[
        gr.Textbox(label="User Input"),
        gr.Slider(minimum=0.000000000000000000000000000000000001, maximum=1.0, value=0.7, step=0.1, label="Temperature"),
    ],
    outputs=gr.Textbox(label="Model Response"),
    title="Hello, I'm Aligned AI! - PPT-RLLMv3 ",
    description=(
        """
        For testing purposes only, please note that there is a stop index/ text strip here, where I remove any token/response beyond the phrase "Thank you for your question, Glad to be of service."
        """
    ),
)

# Launch the interface without the share option
interface.launch()