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import gradio as gr
import torch
from diffusers import StableDiffusionPipeline
from PIL import Image
import time
import traceback
from typing import Optional
# ---- Configuration ----
model_id: str = "runwayml/stable-diffusion-v1-5"
device: str = "cpu" # force CPU usage for compatibility
# ---- Load Model ----
image_generator_pipe: Optional[StableDiffusionPipeline] = None
try:
print(f"Loading Stable Diffusion pipeline ({model_id}) on CPU...")
pipe = StableDiffusionPipeline.from_pretrained(model_id, torch_dtype=torch.float32)
image_generator_pipe = pipe.to(device)
print("Stable Diffusion pipeline loaded successfully.")
except Exception as e:
print(f"Failed to load Stable Diffusion model: {e}")
traceback.print_exc()
# ---- Core Image Generation Function ----
def generate_image_sd(prompt: str, negative_prompt: str, guidance_scale: float, num_inference_steps: int) -> Image.Image:
if not image_generator_pipe:
raise gr.Error("Stable Diffusion pipeline failed to load. Image generation unavailable.")
if not prompt.strip():
raise gr.Error("Prompt cannot be empty.")
print(f"Generating image with prompt: {prompt[:100]}...")
print(f"Negative prompt: {negative_prompt}")
print(f"Guidance scale: {guidance_scale}, Steps: {num_inference_steps}")
start_time = time.time()
try:
with torch.no_grad():
output = image_generator_pipe(
prompt=prompt,
negative_prompt=negative_prompt,
guidance_scale=guidance_scale,
num_inference_steps=num_inference_steps
)
image = output.images[0] if output.images else None
if not image:
raise RuntimeError("No image was returned from the generation pipeline.")
end_time = time.time()
print(f"Image generated in {end_time - start_time:.2f} seconds.")
return image
except Exception as e:
print(f"Error generating image: {e}")
traceback.print_exc()
raise gr.Error(f"Image generation failed: {e}")
# ---- Gradio UI ----
with gr.Blocks(theme=gr.themes.Soft()) as demo:
gr.Markdown("# Stable Diffusion Image Generator (CPU Mode)")
with gr.Row():
with gr.Column(scale=1):
prompt = gr.Textbox(label="Prompt", placeholder="A beautiful futuristic city skyline at night")
neg_prompt = gr.Textbox(label="Negative Prompt", placeholder="blurry, distorted, watermark")
guidance = gr.Slider(1.0, 15.0, value=7.5, step=0.5, label="Guidance Scale")
steps = gr.Slider(10, 50, value=25, step=1, label="Inference Steps")
generate_btn = gr.Button("Generate Image")
with gr.Column(scale=1):
output_image = gr.Image(label="Generated Image", type="pil")
generate_btn.click(
fn=generate_image_sd,
inputs=[prompt, neg_prompt, guidance, steps],
outputs=output_image
)
# ---- Launch ----
if __name__ == "__main__":
if not image_generator_pipe:
print("WARNING: Image generator pipeline is not available. UI will launch, but generation will fail.")
demo.launch(server_name="0.0.0.0", server_port=7860)
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