Upload app.py

app.py

@@ -0,0 +1,398 @@
+import torch
+import torch.nn as nn
+import gradio as gr
+from PIL import Image
+import numpy as np
+import math
+import os
+from threading import Event
+import traceback
+
+# Constants
+IMG_SIZE = 128
+TIMESTEPS = 300  # From second code
+NUM_CLASSES = 2
+
+# Global Cancellation Flag
+cancel_event = Event()
+
+# Device Configuration
+device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+
+# --- Model Definitions ---
+class SinusoidalPositionEmbeddings(nn.Module):
+    def __init__(self, dim):
+        super().__init__()
+        self.dim = dim
+        half_dim = dim // 2
+        emb = math.log(10000) / (half_dim - 1)
+        emb = torch.exp(torch.arange(half_dim) * -emb)  # From second code (no dtype specified)
+        self.register_buffer('embeddings', emb)
+
+    def forward(self, time):
+        device = time.device  # From second code
+        embeddings = self.embeddings.to(device)
+        embeddings = time[:, None] * embeddings[None, :]  # From second code
+        return torch.cat([embeddings.sin(), embeddings.cos()], dim=-1)
+
+class UNet(nn.Module):
+    def __init__(self, in_channels=3, out_channels=3, num_classes=2, time_dim=256):
+        super().__init__()
+        self.num_classes = num_classes
+        self.label_embedding = nn.Embedding(num_classes, time_dim)
+
+        self.time_mlp = nn.Sequential(
+            SinusoidalPositionEmbeddings(time_dim),
+            nn.Linear(time_dim, time_dim),
+            nn.ReLU(),
+            nn.Linear(time_dim, time_dim)
+        )
+
+        # Encoder
+        self.inc = self.double_conv(in_channels, 64)
+        self.down1 = self.down(64 + time_dim * 2, 128)
+        self.down2 = self.down(128 + time_dim * 2, 256)
+        self.down3 = self.down(256 + time_dim * 2, 512)
+
+        # Bottleneck
+        self.bottleneck = self.double_conv(512 + time_dim * 2, 1024)
+
+        # Decoder
+        self.up1 = nn.ConvTranspose2d(1024, 256, kernel_size=2, stride=2)
+        self.upconv1 = self.double_conv(256 + 256 + time_dim * 2, 256)
+
+        self.up2 = nn.ConvTranspose2d(256, 128, kernel_size=2, stride=2)
+        self.upconv2 = self.double_conv(128 + 128 + time_dim * 2, 128)
+
+        self.up3 = nn.ConvTranspose2d(128, 64, kernel_size=2, stride=2)
+        self.upconv3 = self.double_conv(64 + 64 + time_dim * 2, 64)
+
+        self.outc = nn.Conv2d(64, out_channels, kernel_size=1)
+
+    def double_conv(self, in_channels, out_channels):
+        return nn.Sequential(
+            nn.Conv2d(in_channels, out_channels, kernel_size=3, padding=1),
+            nn.ReLU(inplace=True),
+            nn.Conv2d(out_channels, out_channels, kernel_size=3, padding=1),
+            nn.ReLU(inplace=True)
+        )
+
+    def down(self, in_channels, out_channels):
+        return nn.Sequential(
+            nn.MaxPool2d(2),
+            self.double_conv(in_channels, out_channels)
+        )
+
+    def forward(self, x, labels, time):
+        label_indices = torch.argmax(labels, dim=1)
+        label_emb = self.label_embedding(label_indices)
+        t_emb = self.time_mlp(time)
+
+        combined_emb = torch.cat([t_emb, label_emb], dim=1)
+        combined_emb = combined_emb.unsqueeze(-1).unsqueeze(-1)
+
+        x1 = self.inc(x)
+        x1_cat = torch.cat([x1, combined_emb.repeat(1, 1, x1.shape[-2], x1.shape[-1])], dim=1)
+
+        x2 = self.down1(x1_cat)
+        x2_cat = torch.cat([x2, combined_emb.repeat(1, 1, x2.shape[-2], x2.shape[-1])], dim=1)
+
+        x3 = self.down2(x2_cat)
+        x3_cat = torch.cat([x3, combined_emb.repeat(1, 1, x3.shape[-2], x3.shape[-1])], dim=1)
+
+        x4 = self.down3(x3_cat)
+        x4_cat = torch.cat([x4, combined_emb.repeat(1, 1, x4.shape[-2], x4.shape[-1])], dim=1)
+
+        x5 = self.bottleneck(x4_cat)
+
+        x = self.up1(x5)
+        x = torch.cat([x, x3], dim=1)
+        x = torch.cat([x, combined_emb.repeat(1, 1, x.shape[-2], x.shape[-1])], dim=1)
+        x = self.upconv1(x)
+
+        x = self.up2(x)
+        x = torch.cat([x, x2], dim=1)
+        x = torch.cat([x, combined_emb.repeat(1, 1, x.shape[-2], x.shape[-1])], dim=1)
+        x = self.upconv2(x)
+
+        x = self.up3(x)
+        x = torch.cat([x, x1], dim=1)
+        x = torch.cat([x, combined_emb.repeat(1, 1, x.shape[-2], x.shape[-1])], dim=1)
+        x = self.upconv3(x)
+
+        return self.outc(x)
+
+class DiffusionModel(nn.Module):
+    def __init__(self, model, timesteps=TIMESTEPS, time_dim=256):
+        super().__init__()
+        self.model = model
+        self.timesteps = timesteps
+        self.time_dim = time_dim
+
+        # Linear beta schedule with scaling from second code
+        scale = 1000 / timesteps
+        beta_start = scale * 0.0001
+        beta_end = scale * 0.02
+        self.betas = torch.linspace(beta_start, beta_end, timesteps, dtype=torch.float64)
+        self.alphas = 1. - self.betas
+        self.register_buffer('alpha_bars', torch.cumprod(self.alphas, dim=0).float())
+
+    def forward_diffusion(self, x_0, t, noise):
+        x_0 = x_0.float()
+        noise = noise.float()
+        alpha_bar_t = self.alpha_bars[t].view(-1, 1, 1, 1)
+        x_t = torch.sqrt(alpha_bar_t) * x_0 + torch.sqrt(1. - alpha_bar_t) * noise
+        return x_t
+
+    def forward(self, x_0, labels):
+        t = torch.randint(0, self.timesteps, (x_0.shape[0],), device=x_0.device).long()
+        noise = torch.randn_like(x_0)
+        x_t = self.forward_diffusion(x_0, t, noise)
+        predicted_noise = self.model(x_t, labels, t.float())
+        return predicted_noise, noise, t
+
+    @torch.no_grad()
+    def sample(self, num_images, img_size, num_classes, labels, device, progress_callback=None):
+        x_t = torch.randn(num_images, 3, img_size, img_size).to(device)
+
+        if labels.ndim == 1:
+            labels_one_hot = torch.zeros(num_images, num_classes).to(device)
+            labels_one_hot[torch.arange(num_images), labels] = 1
+            labels = labels_one_hot
+        else:
+            labels = labels.to(device)
+
+        for t in reversed(range(self.timesteps)):
+            if cancel_event.is_set():
+                return None
+                
+            t_tensor = torch.full((num_images,), t, device=device, dtype=torch.float)
+            predicted_noise = self.model(x_t, labels, t_tensor)
+
+            beta_t = self.betas[t].to(device)
+            alpha_t = self.alphas[t].to(device)
+            alpha_bar_t = self.alpha_bars[t].to(device)
+
+            mean = (1 / torch.sqrt(alpha_t)) * (x_t - (beta_t / torch.sqrt(1 - alpha_bar_t)) * predicted_noise)
+            variance = beta_t
+
+            if t > 0:
+                noise = torch.randn_like(x_t)
+            else:
+                noise = torch.zeros_like(x_t)
+
+            x_t = mean + torch.sqrt(variance) * noise
+            
+            if progress_callback:
+                progress_callback((self.timesteps - t) / self.timesteps)
+
+        x_0 = torch.clamp(x_t, -1., 1.)
+
+        # Normalization
+        mean = torch.tensor([0.485, 0.456, 0.406]).view(1, 3, 1, 1).to(device)
+        std = torch.tensor([0.229, 0.224, 0.225]).view(1, 3, 1, 1).to(device)
+        x_0 = std * x_0 + mean
+        x_0 = torch.clamp(x_0, 0., 1.)
+
+        return x_0
+
+def load_model(model_path, device):
+    unet_model = UNet(num_classes=NUM_CLASSES).to(device)
+    diffusion_model = DiffusionModel(unet_model, timesteps=TIMESTEPS).to(device)
+
+    if os.path.exists(model_path):
+        checkpoint = torch.load(model_path, map_location=device)
+        
+        if 'model_state_dict' in checkpoint:
+            # Handle training checkpoint format
+            state_dict = {
+                k[6:]: v for k, v in checkpoint['model_state_dict'].items()
+                if k.startswith('model.')
+            }
+            
+            # Load UNet weights
+            unet_model.load_state_dict(state_dict, strict=False)
+            
+            # Initialize diffusion model with loaded UNet
+            diffusion_model = DiffusionModel(unet_model, timesteps=TIMESTEPS).to(device)
+            
+            print(f"Loaded UNet weights from {model_path}")
+        else:
+            # Handle direct model weights format
+            try:
+                # First try loading full DiffusionModel
+                diffusion_model.load_state_dict(checkpoint)
+                print(f"Loaded full DiffusionModel from {model_path}")
+            except RuntimeError:
+                # If that fails, load just the UNet weights
+                unet_model.load_state_dict(checkpoint, strict=False)
+                diffusion_model = DiffusionModel(unet_model, timesteps=TIMESTEPS).to(device)
+                print(f"Loaded UNet weights only from {model_path}")
+    else:
+        print(f"Weights file not found at {model_path}")
+        print("Using randomly initialized weights")
+
+    diffusion_model.eval()
+    return diffusion_model
+
+def cancel_generation():
+    cancel_event.set()
+    return "Generation cancelled"
+
+def generate_images(label_str, num_images, progress=gr.Progress()):
+    global loaded_model
+    cancel_event.clear()
+    
+    if num_images < 1 or num_images > 10:
+        raise gr.Error("Number of images must be between 1 and 10")
+    
+    label_map = {'Pneumonia': 0, 'Pneumothorax': 1}
+    if label_str not in label_map:
+        raise gr.Error("Invalid condition selected")
+
+    labels = torch.zeros(num_images, NUM_CLASSES)
+    labels[:, label_map[label_str]] = 1
+
+    try:
+        def progress_callback(progress_val):
+            progress(progress_val, desc="Generating...")
+            if cancel_event.is_set():
+                raise gr.Error("Generation was cancelled by user")
+
+        with torch.no_grad():
+            images = loaded_model.sample(
+                num_images=num_images,
+                img_size=IMG_SIZE,
+                num_classes=NUM_CLASSES,
+                labels=labels,
+                device=device,
+                progress_callback=progress_callback
+            )
+        
+        if images is None:
+            return None, None
+            
+        processed_images = []
+        for img in images:
+            img_np = img.cpu().permute(1, 2, 0).numpy()
+            img_np = (img_np * 255).clip(0, 255).astype(np.uint8)
+            pil_img = Image.fromarray(img_np)
+            processed_images.append(pil_img)
+        
+        if num_images == 1:
+            return processed_images[0], processed_images
+        else:
+            return None, processed_images
+
+    except Exception as e:
+        traceback.print_exc()
+        raise gr.Error(f"Generation failed: {str(e)}")
+    finally:
+        torch.cuda.empty_cache()
+
+# Load model
+MODEL_NAME = "model_weights.pth"
+model_path = MODEL_NAME
+print("Loading model...")
+try:
+    loaded_model = load_model(model_path, device)
+    print("Model loaded successfully!")
+except Exception as e:
+    print(f"Failed to load model: {e}")
+    print("Creating dummy model for demonstration")
+    loaded_model = DiffusionModel(UNet(num_classes=NUM_CLASSES), timesteps=TIMESTEPS).to(device)
+
+# Gradio UI (from first code)
+with gr.Blocks(theme=gr.themes.Soft(
+    primary_hue="violet",
+    neutral_hue="slate",
+    font=[gr.themes.GoogleFont("Poppins")],
+    text_size="md"
+)) as demo:
+    gr.Markdown("""
+    <center>
+    <h1>Synthetic X-ray Generator</h1>
+    <p><em>Generate synthetic chest X-rays conditioned on pathology</em></p>
+    </center>
+    """)
+    
+    with gr.Row():
+        with gr.Column(scale=1):
+            condition = gr.Dropdown(
+                ["Pneumonia", "Pneumothorax"],
+                label="Select Condition",
+                value="Pneumonia",
+                interactive=True
+            )
+            num_images = gr.Slider(
+                1, 10, value=1, step=1,
+                label="Number of Images",
+                interactive=True
+            )
+            
+            with gr.Row():
+                submit_btn = gr.Button("Generate", variant="primary")
+                cancel_btn = gr.Button("Cancel", variant="stop")
+            
+            gr.Markdown("""
+            <div style="text-align: center; margin-top: 10px;">
+                <small>Note: Generation may take several seconds per image</small>
+            </div>
+            """)
+        
+        with gr.Column(scale=2):
+            with gr.Tabs():
+                with gr.TabItem("Output", id="output_tab"):
+                    single_image = gr.Image(
+                        label="Generated X-ray",
+                        height=400,
+                        visible=True
+                    )
+                    gallery = gr.Gallery(
+                        label="Generated X-rays",
+                        columns=3,
+                        height="auto",
+                        object_fit="contain",
+                        visible=False
+                    )
+    
+    def update_ui_based_on_count(num_images):
+        if num_images == 1:
+            return {
+                single_image: gr.update(visible=True),
+                gallery: gr.update(visible=False)
+            }
+        else:
+            return {
+                single_image: gr.update(visible=False),
+                gallery: gr.update(visible=True)
+            }
+    
+    num_images.change(
+        fn=update_ui_based_on_count,
+        inputs=num_images,
+        outputs=[single_image, gallery]
+    )
+    
+    submit_btn.click(
+        fn=generate_images,
+        inputs=[condition, num_images],
+        outputs=[single_image, gallery]
+    )
+    
+    cancel_btn.click(
+        fn=cancel_generation,
+        outputs=None
+    )
+
+    demo.css = """
+    .gradio-container {
+        background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
+    }
+    .gallery-container {
+        background-color: white !important;
+    }
+    """
+
+if __name__ == "__main__":
+    demo.launch(server_name="0.0.0.0", server_port=7860)