import spaces
import torch
from transformers import AutoTokenizer, AutoModelForCausalLM, TextIteratorStreamer
import gradio as gr
from threading import Thread
device = "cpu"
if torch.cuda.is_available():
    device = "cuda"
if torch.backends.mps.is_available():
    device = "mps"

theme = gr.themes.Base(
    font=[gr.themes.GoogleFont('Libre Franklin'), gr.themes.GoogleFont('Public Sans'), 'system-ui', 'sans-serif'],
)

tokenizer = AutoTokenizer.from_pretrained("microsoft/phi-2", trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(
    "microsoft/phi-2",
    torch_dtype=torch.float16 if torch.cuda.is_available() else torch.float32,
    trust_remote_code=True,
).to(device)
@spaces.GPU(enable_queue=True)
def generate_text(text, temperature, maxLen):
    inputs = tokenizer([text], return_tensors="pt").to(device)
    streamer = TextIteratorStreamer(tokenizer)
    generation_kwargs = dict(inputs, streamer=streamer, max_new_tokens=maxLen, temperature=temperature)
    thread = Thread(target=model.generate, kwargs=generation_kwargs)
    thread.start()
    t = ""
    toks = 0
    for out in streamer:
        t += out
        yield t
with gr.Blocks(theme=theme) as demo:
    gr.Markdown("""
# (Unofficial) Demo of Microsoft's Phi-2 on GPU

The model is suitable for commercial use and is licensed under the MIT license. I am not responsible for any outputs you generate. You are solely responsible for ensuring that your usage of the model complies with applicable laws and regulations.

I am not affiliated with the authors of the model (Microsoft).

Note: for longer generation (>512), keep clicking "Generate!" The demo is currently limited to 512 demos per generation to ensure all users have access to this service. Please note that once you start generating, you cannot stop generating until the generation is done.

By [mrfakename](https://twitter.com/realmrfakename). Inspired by [@randomblock1's demo](https://huggingface.co/spaces/randomblock1/phi-2).

Duplicate this Space to skip the wait!
""".strip())
    gr.DuplicateButton()
    text = gr.Textbox(label="Prompt", lines=10, interactive=True, placeholder="Write a detailed analogy between mathematics and a lighthouse.")
    temp = gr.Slider(label="Temperature", minimum=0.1, maximum=1.5, value=0.7)
    maxlen = gr.Slider(label="Max Length", minimum=4, maximum=512, value=75)
    go = gr.Button("Generate", variant="primary")
    go.click(generate_text, inputs=[text, temp, maxlen], outputs=[text], concurrency_limit=2)
    examples = gr.Examples(
        [
            ['Write a detailed analogy between mathematics and a lighthouse.', 0.7, 75],
            ['Instruct: Write a detailed analogy between mathematics and a lighthouse.\nOutput:', 0.7, 75],
            ['Alice: I don\'t know why, I\'m struggling to maintain focus while studying. Any suggestions?\n\nBob: ', 0.6, 150],
            ['''def print_prime(n):
   """
   Print all primes between 1 and n
   """\n''', 0.2, 100],
        ],
        [text, temp, maxlen]
    )

if __name__ == "__main__":
    demo.queue().launch()