import spaces
import gradio as gr
import torch
#import transformers
#from transformers import AutoTokenizer
#from transformers import pipeline
from diffusers import StableDiffusionXLPipeline, UNet2DConditionModel, EulerDiscreteScheduler
from huggingface_hub import hf_hub_download
from safetensors.torch import load_file

base = "stabilityai/stable-diffusion-xl-base-1.0"
repo = "ByteDance/SDXL-Lightning"
ckpt = "sdxl_lightning_4step_unet.safetensors" # Use the correct ckpt for your step setting!
# Load model.
pipe_box=[]
@spaces.GPU
def init():
    device="cuda:0"
    unet = UNet2DConditionModel.from_config(base, subfolder="unet").to(device, torch.float16)
    unet.load_state_dict(load_file(hf_hub_download(repo, ckpt), device=device))
    pipe = StableDiffusionXLPipeline.from_pretrained(base, unet=unet, torch_dtype=torch.float16, variant="fp16").to(device)
    # Ensure sampler uses "trailing" timesteps.
    pipe.scheduler = EulerDiscreteScheduler.from_config(pipe.scheduler.config, timestep_spacing="trailing")
    pipe_box.append(pipe)
init()
def run():
    pipe=pipe_box[0]
    # Ensure using the same inference steps as the loaded model and CFG set to 0.
    return pipe("A cat", num_inference_steps=4, guidance_scale=0).images[0].save("output.png")




'''
tokenizer = AutoTokenizer.from_pretrained("EleutherAI/gpt-neox-20b")

model = transformers.AutoModelForCausalLM.from_pretrained(
  'mosaicml/mpt-7b-instruct',
  trust_remote_code=True
)


pipe = pipeline('text-generation', model=model, tokenizer=tokenizer, device='cuda:0')

INSTRUCTION_KEY = "### Instruction:"
RESPONSE_KEY = "### Response:"
INTRO_BLURB = "Below is an instruction that describes a task. Write a response that appropriately completes the request."
PROMPT_FOR_GENERATION_FORMAT = """{intro}
{instruction_key}
{instruction}
{response_key}
""".format(
    intro=INTRO_BLURB,
    instruction_key=INSTRUCTION_KEY,
    instruction="{instruction}",
    response_key=RESPONSE_KEY,
)

example = "James decides to run 3 sprints 3 times a week. He runs 60 meters each sprint. How many total meters does he run a week? Explain before answering."
fmt_ex = PROMPT_FOR_GENERATION_FORMAT.format(instruction=example)




@spaces.GPU
def run():
    with torch.autocast('cuda', dtype=torch.bfloat16):
        return(
            pipe('Here is a recipe for vegan banana bread:\n',
                max_new_tokens=100,
                do_sample=True,
                use_cache=True))
'''


with gr.Blocks() as app:
    btn = gr.Button()
    #outp=gr.Textbox()
    outp=gr.Image()
    btn.click(run,None,outp)
app.launch()