app.py

import gradio as gr
from transformers import BlenderbotTokenizer, BlenderbotForConditionalGeneration

model_name = "facebook/blenderbot-400M-distill"
tokenizer = BlenderbotTokenizer.from_pretrained(model_name)
model = BlenderbotForConditionalGeneration.from_pretrained(model_name)

def translate(text,mode):  
    if mode== "ztoe":
        from transformers import AutoModelWithLMHead,AutoTokenizer,pipeline
        mode_name = 'liam168/trans-opus-mt-zh-en'
        model = AutoModelWithLMHead.from_pretrained(mode_name)
        tokenizer = AutoTokenizer.from_pretrained(mode_name)
        translation = pipeline("translation_zh_to_en", model=model, tokenizer=tokenizer)
        translate_result = translation(text, max_length=400)
    if mode ==  "etoz":
        from transformers import AutoModelWithLMHead,AutoTokenizer,pipeline
        mode_name = 'liam168/trans-opus-mt-en-zh'
        model = AutoModelWithLMHead.from_pretrained(mode_name)
        tokenizer = AutoTokenizer.from_pretrained(mode_name)
        translation = pipeline("translation_en_to_zh", model=model, tokenizer=tokenizer)
        translate_result = translation(text, max_length=400)
        
    return translate_result

chat_history=[]

def add_emoji(response):
    # Define the keywords and their corresponding emojis
    keyword_emoji_dict = {
        "happy": "😀",
        "sad": "😢",
        "sorry":"😞",
        "love": "❤️",
        "like": "👍",
        "dislike": "👎",
        "Why": "🥺",
        "cat":"🐱",
        "dog":"🐶",
        "嗨" :  "😎"
    }
    for keyword, emoji in keyword_emoji_dict.items():
        response = response.replace(keyword, f"{keyword} {emoji}")
    return response

def add_shortform(response):
    # Define the keywords and their corresponding keywords
    keyword_shortform_dict = {
        "You only live once": "YOLO",
        "funny": "LOL",
        "laugh":"LOL",
        "nevermind": "nvm",
        "sorry": "sorryyyyy",
        "tell me": "LMK",
        "By the way": "BTW",
        "don't know":"DK",
        "do not know":"IDK"    
    }
    for keyword, st in keyword_shortform_dict.items():
        response = response.replace(keyword, f"{st}")
    return response

def chatbot(text,name):
    global chat_history
    global Itext
    global bname 
    if name=='':
        name="your chatbot"
    bname= name
    Itext=text
    
    # Try to detect the language of the input text
    # If the input language is Chinese, convert the text to lowercase and check if it contains any Chinese characters
    is_chinese = any(0x4e00 <= ord(char) <= 0x9fff for char in text.lower())
    if is_chinese:
        text = translate(text,"ztoe")
        text=f"{text}"
        text=text[23:(len(text)-3)]
            
    # Look for keywords in the previous chat history
    keyword_responses = {
        "how are you": "I'm doing well😄, thank you for asking!",
        "bye": "Goodbye!👊🏻",
        "thank you": "You're welcome!😃",
        "hello": f'I am {bname}. Nice to meet you!😎',
        "Hello": f'I am {bname}. Nice to meet you!😎',
        "Hi": f'I am {bname}. Nice to meet you!😎',
        "hi": f'I am {bname}. Nice to meet you!😎',   
    }

     # Generate a response based on the previous messages
    if len(chat_history) > 0:
        # Get the last message from the chat history
        last_message = chat_history[-1][1]
        # Generate a response based on the last message
        encoded_input = tokenizer.encode(last_message + tokenizer.eos_token + text, return_tensors='pt')
        generated = model.generate(encoded_input, max_length=1024, do_sample=True)
        response = tokenizer.decode(generated[0], skip_special_tokens=True)
        response=f"{response}"
    else:
        # If there is no previous message, generate a response using the default method
        encoded_input = tokenizer(text, return_tensors='pt')
        generated = model.generate(**encoded_input)
        response = tokenizer.batch_decode(generated, skip_special_tokens=True)[0]
        response=f"{response}"
    if text in keyword_responses:
            response = keyword_responses[text]
        

    # If the input language was Chinese, translate the response back to Chinese
    if is_chinese:
        from hanziconv import HanziConv
        response = translate(response,"etoz")
        response = HanziConv.toTraditional(f"{response}")
        response = f"{response} "
        response=response[23:(len(response)-4)]
    else:
        response = response

    # Add emojis to the response
    response = add_emoji(response)
    response = add_shortform(response)
    chat_history.append((Itext,response))
 
    # Format the chat history as an HTML string for display
    history_str = ""
    for name, msg in chat_history:
        history_str += f"<strong>{name}:</strong> {msg}<br>"
    # Return the response along with the chat history
    return (chat_history)

iface =gr.Interface(fn=chatbot,
    inputs=[gr.inputs.Textbox(label="Chat", placeholder="Say somehting"),
    gr.inputs.Textbox(label="Name the Bot", placeholder="give me a name")],
    outputs=[gr.Chatbot(label="Chat Here")], 
    title="Emphatic Chatbot",
    allow_flagging=False,
    layout="vertical",
    theme='gstaff/xkcd' ,
    examples=[["再見"], ["Hello"]]
    )
#.launch(share=True)

iface.launch(share=True)