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import gradio as gr
import torch
from transformers import GPT2Tokenizer, GPT2LMHeadModel

checkpoint = "gpt2"
tokenizer = GPT2Tokenizer.from_pretrained(checkpoint)


# Load the fine-tuned model and tokenizer
my_model = GPT2LMHeadModel.from_pretrained("jeevana/GenerativeQnASystem")
my_tokenizer = GPT2Tokenizer.from_pretrained("jeevana/GenerativeQnASystem")

def generate_response(model, tokenizer, prompt):
    input_ids = tokenizer.encode(prompt, return_tensors="pt",truncation=True, max_length=1000)
    # Create the attention mask and pad token id
    attention_mask = torch.ones_like(input_ids)
    pad_token_id = tokenizer.eos_token_id

    output = model.generate(
        input_ids,
        max_new_tokens=70,
        min_new_tokens = 1,
        num_return_sequences=1,
        attention_mask=attention_mask,
        pad_token_id=pad_token_id
    )
    qna = tokenizer.decode(output[0], skip_special_tokens=True)
    answer = qna[len(prompt)+9: ]
    return answer


def generative_qna(input):
  response = generate_response(my_model, my_tokenizer, input)
  return response

# def generative_qna(input):
#     print(input)
#     return input

app = gr.Interface(fn=generative_qna, inputs=[gr.Textbox(label="Question", lines=3)],
                    outputs=[gr.Textbox(label="Answer", lines=6)],
                    title="Generative QnA System",
                    description="Generative QnA with GPT2"
                   )
app.launch(share=True, debug=True)


# gr.load("models/jeevana/GenerativeQnASystem").launch()