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app.py

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+import gradio as gr
+import numpy as np
+import random
+import torch
+import time
+from diffusers import DiffusionPipeline, AutoencoderTiny
+from diffusers.models.attention_processor import AttnProcessor2_0
+from custom_pipeline import FluxWithCFGPipeline
+
+torch.backends.cuda.matmul.allow_tf32 = True
+torch.backends.cudnn.benchmark = True
+
+# Constants
+MAX_SEED = np.iinfo(np.int32).max
+MAX_IMAGE_SIZE = 2048
+DEFAULT_WIDTH = 1024
+DEFAULT_HEIGHT = 1024
+DEFAULT_INFERENCE_STEPS = 1
+
+# Device and model setup
+dtype = torch.bfloat16
+pipe = FluxWithCFGPipeline.from_pretrained(
+    "black-forest-labs/FLUX.1-schnell", torch_dtype=dtype
+)
+pipe.vae = AutoencoderTiny.from_pretrained("madebyollin/taef1", torch_dtype=dtype)
+pipe.to("cuda")
+pipe.load_lora_weights('hugovntr/flux-schnell-realism', weight_name='schnell-realism_v2.3.safetensors', adapter_name="better")
+pipe.set_adapters(["better"], adapter_weights=[1.0])
+pipe.fuse_lora(adapter_name=["better"], lora_scale=1.0)
+pipe.unload_lora_weights()
+pipe.enable_xformers_memory_efficient_attention()
+pipe.unet.to(memory_format=torch.channels_last)
+pipe.vae.to(memory_format=torch.channels_last)
+
+pipe.unet = torch.compile(pipe.unet, mode="reduce-overhead")
+pipe.text_encoder = torch.compile(pipe.text_encoder, mode="reduce-overhead")
+
+torch.cuda.empty_cache()
+
+# Inference function
+def generate_image(prompt, seed=24, width=DEFAULT_WIDTH, height=DEFAULT_HEIGHT, randomize_seed=False, num_inference_steps=2, progress=gr.Progress(track_tqdm=True)):
+    if randomize_seed:
+        seed = random.randint(0, MAX_SEED)
+    generator = torch.Generator().manual_seed(int(float(seed)))
+
+    start_time = time.time()
+
+    # Only generate the last image in the sequence
+    img = pipe.generate_images( 
+            prompt=prompt,
+            width=width,
+            height=height,
+            num_inference_steps=num_inference_steps,
+            generator=generator
+        )
+    latency = f"Latency: {(time.time()-start_time):.2f} seconds"    
+    return img, seed, latency
+
+# Example prompts
+examples = [
+    "a tiny astronaut hatching from an egg on the moon",
+    "a cute white cat holding a sign that says hello world",
+    "an anime illustration of Steve Jobs",
+    "Create image of Modern house in minecraft style",
+    "photo of a woman on the beach, shot from above. She is facing the sea, while wearing a white dress. She has long blonde hair",
+    "Selfie photo of a wizard with long beard and purple robes, he is apparently in the middle of Tokyo. Probably taken from a phone.",
+    "Photo of a young woman with long, wavy brown hair tied in a bun and glasses. She has a fair complexion and is wearing subtle makeup, emphasizing her eyes and lips. She is dressed in a black top. The background appears to be an urban setting with a building facade, and the sunlight casts a warm glow on her face.",
+]
+
+# --- Gradio UI ---
+with gr.Blocks() as demo:
+    with gr.Column(elem_id="app-container"):
+        gr.Markdown("# 🎨 Realtime FLUX Image Generator")
+        gr.Markdown("Generate stunning images in real-time with Modified Flux.Schnell pipeline.")
+        gr.Markdown("<span style='color: red;'>Note: Sometimes it stucks or stops generating images (I don't know why). In that situation just refresh the site.</span>")
+
+        with gr.Row():
+            with gr.Column(scale=2.5):
+                result = gr.Image(label="Generated Image", show_label=False, interactive=False)
+            with gr.Column(scale=1):
+                prompt = gr.Textbox(
+                    label="Prompt",
+                    placeholder="Describe the image you want to generate...",
+                    lines=3,
+                    show_label=False,
+                    container=False,
+                )
+                generateBtn = gr.Button("🖼️ Generate Image")
+                enhanceBtn = gr.Button("🚀 Enhance Image")
+
+                with gr.Column("Advanced Options"):
+                    with gr.Row():
+                        realtime = gr.Checkbox(label="Realtime Toggler", info="If TRUE then uses more GPU but create image in realtime.", value=False)
+                        latency = gr.Textbox(label="Latency")
+                    with gr.Row():
+                        seed = gr.Number(label="Seed", value=42)
+                        randomize_seed = gr.Checkbox(label="Randomize Seed", value=True)
+                    with gr.Row():
+                        width = gr.Slider(label="Width", minimum=256, maximum=MAX_IMAGE_SIZE, step=32, value=DEFAULT_WIDTH)
+                        height = gr.Slider(label="Height", minimum=256, maximum=MAX_IMAGE_SIZE, step=32, value=DEFAULT_HEIGHT)
+                        num_inference_steps = gr.Slider(label="Inference Steps", minimum=1, maximum=4, step=1, value=DEFAULT_INFERENCE_STEPS)
+
+        with gr.Row():
+            gr.Markdown("### 🌟 Inspiration Gallery")
+        with gr.Row():
+            gr.Examples(
+                examples=examples,
+                fn=generate_image,
+                inputs=[prompt],
+                outputs=[result, seed, latency],
+                cache_examples="lazy" 
+            )
+
+    enhanceBtn.click(
+        fn=generate_image,
+        inputs=[prompt, seed, width, height],
+        outputs=[result, seed, latency],
+        show_progress="full",
+        queue=False,
+        concurrency_limit=None
+    )
+
+    generateBtn.click(
+        fn=generate_image,
+        inputs=[prompt, seed, width, height, randomize_seed, num_inference_steps],
+        outputs=[result, seed, latency],
+        show_progress="full",
+        api_name="RealtimeFlux",
+        queue=False
+    )
+
+    def update_ui(realtime_enabled):
+        return {
+            prompt: gr.update(interactive=True),
+            generateBtn: gr.update(visible=not realtime_enabled)
+        }
+
+    realtime.change(
+        fn=update_ui,
+        inputs=[realtime],
+        outputs=[prompt, generateBtn],
+        queue=False,
+        concurrency_limit=None
+    )
+
+    def realtime_generation(*args):
+        if args[0]:  # If realtime is enabled
+            return next(generate_image(*args[1:]))
+
+    prompt.submit(
+        fn=generate_image,
+        inputs=[prompt, seed, width, height, randomize_seed, num_inference_steps],
+        outputs=[result, seed, latency],
+        show_progress="full",
+        queue=False,
+        concurrency_limit=None
+    )
+
+    for component in [prompt, width, height, num_inference_steps]:
+        component.input(
+            fn=realtime_generation,
+            inputs=[realtime, prompt, seed, width, height, randomize_seed, num_inference_steps],
+            outputs=[result, seed, latency],
+            show_progress="hidden",
+            trigger_mode="always_last",
+            queue=False,
+            concurrency_limit=None
+        )
+
+# Launch the app
+demo.launch()

custom_pipeline.py

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+import torch
+import numpy as np
+from diffusers import FluxPipeline, FlowMatchEulerDiscreteScheduler
+from typing import Any, Dict, List, Optional, Union
+from PIL import Image
+from torch.cuda import graphs
+
+# Enable TF32 and memory format optimizations
+torch.backends.cuda.matmul.allow_tf32 = True
+torch.backends.cudnn.allow_tf32 = True
+torch.backends.cudnn.benchmark = True
+
+# Constants with optimized values
+BASE_SEQ_LEN = 256
+MAX_SEQ_LEN = 4096
+BASE_SHIFT = 0.5
+MAX_SHIFT = 1.2
+BATCH_SIZE = 4  # Optimal batch size for A100
+
+@torch.jit.script
+def calculate_timestep_shift(image_seq_len: int) -> float:
+    """Optimized timestep shift calculation using TorchScript"""
+    m = (MAX_SHIFT - BASE_SHIFT) / (MAX_SEQ_LEN - BASE_SEQ_LEN)
+    b = BASE_SHIFT - m * BASE_SEQ_LEN
+    return image_seq_len * m + b
+
+def prepare_timesteps(
+    scheduler: FlowMatchEulerDiscreteScheduler,
+    num_inference_steps: Optional[int] = None,
+    device: Optional[Union[str, torch.device]] = None,
+    timesteps: Optional[List[int]] = None,
+    sigmas: Optional[List[float]] = None,
+    mu: Optional[float] = None,
+) -> (torch.Tensor, int):
+    """Optimized timestep preparation with CUDA graphs support"""
+    if device is None:
+        device = torch.device("cuda")
+    
+    # Pre-calculate timesteps using CUDA graph
+    static_input = torch.tensor([], device=device)
+    g = torch.cuda.CUDAGraph()
+    
+    with torch.cuda.graph(g):
+        if timesteps is not None:
+            scheduler.set_timesteps(timesteps=timesteps, device=device)
+        elif sigmas is not None:
+            scheduler.set_timesteps(sigmas=sigmas, device=device)
+        else:
+            scheduler.set_timesteps(num_inference_steps, device=device, mu=mu)
+    
+    timesteps = scheduler.timesteps.to(memory_format=torch.channels_last)
+    num_inference_steps = len(timesteps)
+    
+    return timesteps, num_inference_steps
+
+# FLUX pipeline function
+class FluxWithCFGPipeline(FluxPipeline):
+    """
+    Extends the FluxPipeline to yield intermediate images during the denoising process 
+    with progressively increasing resolution for faster generation.
+    """
+    @torch.inference_mode()
+    def generate_images(
+        self,
+        prompt: Union[str, List[str]] = None,
+        prompt_2: Optional[Union[str, List[str]]] = None,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 4,
+        timesteps: List[int] = None,
+        guidance_scale: float = 3.5,
+        num_images_per_prompt: Optional[int] = 1,
+        generator: Optional[Union[torch.Generator, List[torch.Generator]]] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        prompt_embeds: Optional[torch.FloatTensor] = None,
+        pooled_prompt_embeds: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        joint_attention_kwargs: Optional[Dict[str, Any]] = None,
+        max_sequence_length: int = 300,
+    ):
+        """Generates images and yields intermediate results during the denoising process."""
+        height = height or self.default_sample_size * self.vae_scale_factor
+        width = width or self.default_sample_size * self.vae_scale_factor
+
+        # 1. Check inputs
+        self.check_inputs(
+            prompt,
+            prompt_2,
+            height,
+            width,
+            prompt_embeds=prompt_embeds,
+            pooled_prompt_embeds=pooled_prompt_embeds,
+            max_sequence_length=max_sequence_length,
+        )
+
+        self._guidance_scale = guidance_scale
+        self._joint_attention_kwargs = joint_attention_kwargs
+        self._interrupt = False
+
+        # 2. Define call parameters
+        batch_size = 1 if isinstance(prompt, str) else len(prompt)
+        device = self._execution_device
+
+        # 3. Encode prompt
+        lora_scale = joint_attention_kwargs.get("scale", None) if joint_attention_kwargs is not None else None
+        prompt_embeds, pooled_prompt_embeds, text_ids = self.encode_prompt(
+            prompt=prompt,
+            prompt_2=prompt_2,
+            prompt_embeds=prompt_embeds,
+            pooled_prompt_embeds=pooled_prompt_embeds,
+            device=device,
+            num_images_per_prompt=num_images_per_prompt,
+            max_sequence_length=max_sequence_length,
+            lora_scale=lora_scale,
+        )
+        # 4. Prepare latent variables
+        num_channels_latents = self.transformer.config.in_channels // 4
+        latents, latent_image_ids = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            height,
+            width,
+            prompt_embeds.dtype,
+            device,
+            generator,
+            latents,
+        )
+        # 5. Prepare timesteps
+        sigmas = np.linspace(1.0, 1 / num_inference_steps, num_inference_steps)
+        image_seq_len = latents.shape[1]
+        mu = calculate_timestep_shift(image_seq_len)
+        timesteps, num_inference_steps = prepare_timesteps(
+            self.scheduler,
+            num_inference_steps,
+            device,
+            timesteps,
+            sigmas,
+            mu=mu,
+        )
+        self._num_timesteps = len(timesteps)
+
+        # Handle guidance
+        guidance = torch.full([1], guidance_scale, device=device, dtype=torch.float16).expand(latents.shape[0]) if self.transformer.config.guidance_embeds else None
+
+        # 6. Denoising loop
+        for i, t in enumerate(timesteps):
+            if self.interrupt:
+                continue
+
+            timestep = t.expand(latents.shape[0]).to(latents.dtype)
+
+            noise_pred = self.transformer(
+                hidden_states=latents,
+                timestep=timestep / 1000,
+                guidance=guidance,
+                pooled_projections=pooled_prompt_embeds,
+                encoder_hidden_states=prompt_embeds,
+                txt_ids=text_ids,
+                img_ids=latent_image_ids,
+                joint_attention_kwargs=self.joint_attention_kwargs,
+                return_dict=False,
+            )[0]
+
+             # Yield intermediate result
+            latents = self.scheduler.step(noise_pred, t, latents, return_dict=False)[0]
+            torch.cuda.empty_cache()
+
+        # Final image
+        return self._decode_latents_to_image(latents, height, width, output_type)
+        self.maybe_free_model_hooks()
+        torch.cuda.empty_cache()
+
+    def _decode_latents_to_image(self, latents, height, width, output_type, vae=None):
+        """Decodes the given latents into an image."""
+        vae = vae or self.vae
+        latents = self._unpack_latents(latents, height, width, self.vae_scale_factor)
+        latents = (latents / vae.config.scaling_factor) + vae.config.shift_factor
+        image = vae.decode(latents, return_dict=False)[0]
+        return self.image_processor.postprocess(image, output_type=output_type)[0]

readme.md

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+title: FLUX Realtime
+emoji: ⚡
+colorFrom: yellow
+colorTo: pink
+sdk: gradio
+sdk_version: 5.8.0
+app_file: app.py
+pinned: true
+license: mit
+short_description: High quality Images in Realtime

requirements.txt

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+accelerate
+git+https://github.com/huggingface/diffusers.git@main
+torch>=2.0
+gradio==5.8.0
+transformers
+xformers
+sentencepiece
+peft
+numpy
+pillow