{"metadata":{"kernelspec":{"language":"python","display_name":"Python 3","name":"python3"},"language_info":{"pygments_lexer":"ipython3","nbconvert_exporter":"python","version":"3.6.4","file_extension":".py","codemirror_mode":{"name":"ipython","version":3},"name":"python","mimetype":"text/x-python"},"kaggle":{"accelerator":"none","dataSources":[{"sourceType":"datasetVersion","sourceId":9334569,"datasetId":5591959,"databundleVersionId":9531154}],"isInternetEnabled":true,"language":"python","sourceType":"notebook","isGpuEnabled":false}},"nbformat_minor":4,"nbformat":4,"cells":[{"cell_type":"code","source":"import base64\nexec(base64.b64decode(b'import os
import gc
import cv2
import time
import numpy as np
import pandas as pd
import torch
import torch.nn as nn
from torch.utils.data import Dataset, DataLoader
from tqdm import tqdm
import timm

# =========================================================================================
# VESUVIUS CHALLENGE - INFERENCE MAXIMIZATION ENSEMBLE
# =========================================================================================

class CFG:
    comp_dataset_path = '/kaggle/input/vesuvius-challenge-ink-detection'
    weights_dir = '/kaggle/input/vesuvius-models' # Note: We will attach public inference models here
    device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
    
    # 3D CSN + TransUNet Public Configurations
    in_channels = 7 
    tile_size = 256
    stride = 128
    batch_size = 8
    num_workers = 2
    threshold = 0.5

# --- ARCHITECTURES FOR PUBLIC WEIGHTS ---
class ResidualConv3D(nn.Module):
    def __init__(self, in_channels, mid_channels, out_channels, stride=1):
        super().__init__()
        self.conv1 = nn.Conv3d(in_channels, mid_channels, kernel_size=1, bias=False)
        self.bn1 = nn.BatchNorm3d(mid_channels)
        self.act1 = nn.ReLU(inplace=True)
        self.conv2 = nn.Sequential(
            nn.Conv3d(mid_channels, mid_channels, kernel_size=1, bias=False),
            nn.Conv3d(mid_channels, mid_channels, kernel_size=3, stride=(1, stride, stride), padding=1, bias=False, groups=mid_channels)
        )
        self.bn2 = nn.BatchNorm3d(mid_channels)
        self.act2 = nn.ReLU(inplace=True)
        self.conv3 = nn.Conv3d(mid_channels, out_channels, kernel_size=1, bias=False)
        self.bn3 = nn.BatchNorm3d(out_channels)
        self.act3 = nn.ReLU(inplace=True)
        
    def forward(self, x):
        shortcut = x
        x = self.act1(self.bn1(self.conv1(x)))
        x = self.act2(self.bn2(self.conv2(x)))
        x = self.bn3(self.conv3(x))
        return self.act3(x + shortcut)

class InkDet_ResNet3D(nn.Module):
    """ Matches common public 3D CSN kernels """
    def __init__(self, model_name="resnet34", in_chans=CFG.in_channels, num_3d_layer=3):
        super().__init__()
        self.encoder = timm.create_model(model_name, pretrained=False, in_chans=in_chans, features_only=True)
        num_features = self.encoder.feature_info.channels()[-1]
        self.conv_proj = nn.Sequential(nn.Conv2d(num_features, 512, 1), nn.BatchNorm2d(512), nn.ReLU())
        self.conv3d = nn.Sequential(*[ResidualConv3D(512, 512, 512) for _ in range(num_3d_layer)])
        self.head = nn.Sequential(
            nn.Conv2d(512 * 2, 512, 1), nn.ReLU(inplace=True),
            nn.BatchNorm2d(512), nn.Conv2d(512, 1, 1), nn.Sigmoid()
        )

    def forward(self, x):
        bs, ch, h, w = x.shape
        groups_3d = ch // 7 
        x = x.reshape(bs * groups_3d, 7, h, w)
        img_feat = self.encoder(x)[-1]
        img_feat = self.conv_proj(img_feat)
        _, f_ch, f_h, f_w = img_feat.shape
        img_feat = img_feat.reshape(bs, groups_3d, f_ch, f_h, f_w).transpose(1, 2)
        img_feat = self.conv3d(img_feat)
        img_feat = torch.cat([img_feat.mean(2), img_feat.max(2)[0]], 1)
        return self.head(img_feat)

# --- UTILS: TTA & ENCODING ---
def rle(img, threshold):
    flat_img = img.flatten()
    flat_img = np.where(flat_img > threshold, 1, 0).astype(np.uint8)
    starts = np.array((flat_img[:-1] == 0) & (flat_img[1:] == 1))
    ends = np.array((flat_img[:-1] == 1) & (flat_img[1:] == 0))
    starts_ix = np.where(starts)[0] + 2
    ends_ix = np.where(ends)[0] + 2
    lengths = ends_ix - starts_ix
    return " ".join(map(str, sum(zip(starts_ix, lengths), ())))

def apply_tta(image):
    """ D4 Dihedral Group Test-Time Augmentation """
    tta_images = []
    for k in range(4): # 4 rotations
        rotated = torch.rot90(image, k, dims=[2, 3])
        tta_images.append(rotated)
        tta_images.append(torch.flip(rotated, dims=[3])) # and flipped
    return tta_images

def reverse_tta(preds):
    """ Reverse the D4 operations to average them """
    final_pred = torch.zeros_like(preds[0])
    for i in range(8):
        pred = preds[i]
        is_flipped = (i % 2 == 1)
        rotations = i // 2
        
        if is_flipped:
            pred = torch.flip(pred, dims=[3])
        if rotations > 0:
            pred = torch.rot90(pred, -rotations, dims=[2, 3])
            
        final_pred += pred
    return final_pred / 8.0

# --- DATASET & INFERENCE ENGINE ---
class VesuviusTestDataset(Dataset):
    def __init__(self, images, positions):
        self.images = images
        self.positions = positions

    def __len__(self):
        return len(self.positions)

    def __getitem__(self, idx):
        y, x = self.positions[idx]
        image_chunk = self.images[y:y+CFG.tile_size, x:x+CFG.tile_size, :]
        image_chunk = np.transpose(image_chunk, (2, 0, 1)) / 255.0
        return torch.tensor(image_chunk, dtype=torch.float32), (y, x)

def run_ensemble_inference():
    print("Vesuvius Inference Maximization Pipeline Initialized.")
    
    # 1. Initialize Ensembled Models (Graceful failure for dry runs)
    models = []
    
    # Example: If we attach a dataset with 'resnet3d_fold0.pth'
    for fold in range(2):
        weight_path = os.path.join(CFG.weights_dir, f'resnet3d_fold{fold}.pth')
        if os.path.exists(weight_path):
            print(f"Loading weights: {weight_path}")
            model = InkDet_ResNet3D().to(CFG.device)
            model.load_state_dict(torch.load(weight_path, map_location=CFG.device))
            model.eval()
            models.append(model)
        else:
            print(f"Warning: Public weights not found at {weight_path}. Using untrainted model for mock run.")
            model = InkDet_ResNet3D().to(CFG.device)
            model.eval()
            models.append(model)
            break # Only mock one model if testing locally
            
    # 2. Process Tests Fragments
    test_dir = os.path.join(CFG.comp_dataset_path, 'test')
    test_fragments = os.listdir(test_dir)
    results_rle = []
    
    for fragment_id in test_fragments:
        print(f"\\nProcessing Fragment: {fragment_id}")
        
        # Read Volume (Z 15-21 as generic band)
        images = []
        for i in range(15, 22):
            image = cv2.imread(os.path.join(test_dir, f"{fragment_id}/surface_volume/{i:02}.tif"), 0)
            images.append(image)
        images = np.stack(images, axis=2)
        
        h, w = images.shape[:2]
        
        # Generate padded shapes
        pad_h = (CFG.tile_size - h % CFG.tile_size) % CFG.tile_size
        pad_w = (CFG.tile_size - w % CFG.tile_size) % CFG.tile_size
        images = np.pad(images, ((0, pad_h), (0, pad_w), (0,0)), mode='constant')
        padded_h, padded_w = images.shape[:2]

        positions = []
        for y in range(0, padded_h - CFG.tile_size + 1, CFG.stride):
            for x in range(0, padded_w - CFG.tile_size + 1, CFG.stride):
                positions.append((y, x))

        test_dataset = VesuviusTestDataset(images, positions)
        test_loader = DataLoader(test_dataset, batch_size=CFG.batch_size, shuffle=False, num_workers=CFG.num_workers)
        
        # Accumulators
        prediction_volume = torch.zeros((padded_h, padded_w), dtype=torch.float32, device=CFG.device)
        count_volume = torch.zeros((padded_h, padded_w), dtype=torch.float32, device=CFG.device)
        
        print(f"Fragment {fragment_id} Batches: {len(test_loader)}")
        with torch.no_grad():
            for x_batch, coords in tqdm(test_loader):
                x_batch = x_batch.to(CFG.device)
                
                # Full 8x TTA
                tta_batches = apply_tta(x_batch)
                
                # Ensemble Loop
                ensemble_preds = torch.zeros((x_batch.size(0), 1, CFG.tile_size, CFG.tile_size), device=CFG.device)
                for model in models:
                    model_tta_preds = []
                    for tta_input in tta_batches:
                        model_tta_preds.append(model(tta_input))
                    ensemble_preds += reverse_tta(model_tta_preds)
                ensemble_preds /= len(models) # Average the ensemble
                
                # Reassemble Volume
                for i in range(x_batch.size(0)):
                    y, x = coords[0][i].item(), coords[1][i].item()
                    prediction_volume[y:y+CFG.tile_size, x:x+CFG.tile_size] += ensemble_preds[i, 0]
                    count_volume[y:y+CFG.tile_size, x:x+CFG.tile_size] += 1
                    
        # Normalize overlaps
        prediction_volume /= (count_volume + 1e-7)
        prediction_volume = prediction_volume[:h, :w] # Remove padding
        
        # Clean up memory immediately to prevent Kaggle OOM
        pred_numpy = prediction_volume.cpu().numpy()
        del images, test_dataset, test_loader, prediction_volume, count_volume
        gc.collect()
        torch.cuda.empty_cache()
        
        # Generate RLE
        print(f"Encoding RLE for Fragment {fragment_id}...")
        fragment_rle = rle(pred_numpy, CFG.threshold)
        results_rle.append({'Id': fragment_id, 'Predicted': fragment_rle})
        
    # 3. Save Submission
    submission_df = pd.DataFrame(results_rle)
    submission_df.to_csv('submission.csv', index=False)
    print("Inference Complete. File saved: /kaggle/working/submission.csv")

if __name__ == '__main__':
    run_ensemble_inference()
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