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app.py

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+import gradio as gr
+
+import torch
+from transformers import (
+    AutoTokenizer,
+    AutoModelForCausalLM,
+    TextIteratorStreamer,
+    pipeline,
+)
+from threading import Thread
+
+# The huggingface model id for Microsoft's phi-2 model
+checkpoint = "microsoft/phi-2"
+
+# Download and load model and tokenizer
+tokenizer = AutoTokenizer.from_pretrained(checkpoint, trust_remote_code=True)
+model = AutoModelForCausalLM.from_pretrained(
+    checkpoint, torch_dtype=torch.float32, device_map="cpu", trust_remote_code=True
+)
+
+# Text generation pipeline
+phi2 = pipeline(
+    "text-generation",
+    tokenizer=tokenizer,
+    model=model,
+    pad_token_id=tokenizer.eos_token_id,
+    eos_token_id=tokenizer.eos_token_id,
+    device_map="cpu",
+)
+
+
+# Function that accepts a prompt and generates text using the phi2 pipeline
+def generate(message, chat_history, max_new_tokens):
+    instruction = "You are a helpful assistant to 'User'. You do not respond as 'User' or pretend to be 'User'. You only respond once as 'Assistant'."
+    final_prompt = f"Instruction: {instruction}\n"
+
+    for sent, received in chat_history:
+        final_prompt += "User: " + sent + "\n"
+        final_prompt += "Assistant: " + received + "\n"
+
+    final_prompt += "User: " + message + "\n"
+    final_prompt += "Output:"
+
+    # Streamer
+    streamer = TextIteratorStreamer(
+        tokenizer=tokenizer, skip_prompt=True, skip_special_tokens=True, timeout=300.0
+    )
+    thread = Thread(
+        target=phi2,
+        kwargs={
+            "text_inputs": final_prompt,
+            "max_new_tokens": max_new_tokens,
+            "streamer": streamer,
+        },
+    )
+    thread.start()
+
+    generated_text = ""
+    for word in streamer:
+        generated_text += word
+        response = generated_text.strip()
+
+        if "User:" in response:
+            response = response.split("User:")[0].strip()
+
+        if "Assistant:" in response:
+            response = response.split("Assistant:")[1].strip()
+
+        yield response
+
+
+# Chat interface with gradio
+with gr.Blocks() as demo:
+    gr.Markdown(
+        """
+  # Phi-2 Chatbot Demo
+  This chatbot was created using Microsoft's 2.7 billion parameter [phi-2](https://huggingface.co/microsoft/phi-2) Transformer model. 
+  
+  In order to reduce the response time on this hardware, `max_new_tokens` has been set to `21` in the text generation pipeline. With this default configuration, it takes approximately `60 seconds` for the response to start being generated, and streamed one word at a time. Use the slider below to increase or decrease the length of the generated text.
+  """
+    )
+
+    tokens_slider = gr.Slider(
+        8,
+        128,
+        value=21,
+        label="Maximum new tokens",
+        info="A larger `max_new_tokens` parameter value gives you longer text responses but at the cost of a slower response time.",
+    )
+
+    chatbot = gr.ChatInterface(
+        fn=generate,
+        additional_inputs=[tokens_slider],
+        stop_btn=None,
+        examples=[["Who is Leonhard Euler?"]],
+    )
+
+demo.queue().launch()

requirements.txt

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+torch
+transformers
+accelerate
+einops