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src//dataset.py

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+"""DataLoader'ы с агрессивной аугментацией под малый датасет."""
+from __future__ import annotations
+from pathlib import Path
+
+import cv2
+import numpy as np
+from torch.utils.data import Dataset, DataLoader, WeightedRandomSampler
+import albumentations as A
+from albumentations.pytorch import ToTensorV2
+
+from . import config as C
+from .prepare_data import imread_unicode
+
+
+CLASS_TO_IDX = {"clean": 0, "defect": 1}
+
+
+def build_transforms(train: bool) -> A.Compose:
+    if train:
+        return A.Compose([
+            A.LongestMaxSize(max_size=C.IMG_SIZE + 32),
+            A.PadIfNeeded(min_height=C.IMG_SIZE + 32, min_width=C.IMG_SIZE + 32,
+                          border_mode=cv2.BORDER_REFLECT_101),
+            A.RandomCrop(height=C.IMG_SIZE, width=C.IMG_SIZE),
+            A.HorizontalFlip(p=0.5),
+            A.VerticalFlip(p=0.5),
+            A.RandomRotate90(p=0.5),
+            A.OneOf([
+                A.RandomBrightnessContrast(brightness_limit=0.25, contrast_limit=0.25, p=1.0),
+                A.HueSaturationValue(hue_shift_limit=8, sat_shift_limit=20, val_shift_limit=20, p=1.0),
+                A.CLAHE(clip_limit=2.0, p=1.0),
+            ], p=0.7),
+            A.OneOf([
+                A.GaussianBlur(blur_limit=(3, 5), p=1.0),
+                A.MotionBlur(blur_limit=5, p=1.0),
+                A.GaussNoise(var_limit=(5.0, 25.0), p=1.0),
+            ], p=0.4),
+            # имитируем блики/тени из реального цеха
+            A.RandomShadow(p=0.2),
+            A.RandomSunFlare(src_radius=80, num_flare_circles_lower=1,
+                             num_flare_circles_upper=2, p=0.15),
+            A.CoarseDropout(max_holes=4, max_height=48, max_width=48, p=0.3),
+            A.Normalize(mean=(0.485, 0.456, 0.406), std=(0.229, 0.224, 0.225)),
+            ToTensorV2(),
+        ])
+    return A.Compose([
+        A.LongestMaxSize(max_size=C.IMG_SIZE),
+        A.PadIfNeeded(min_height=C.IMG_SIZE, min_width=C.IMG_SIZE,
+                      border_mode=cv2.BORDER_REFLECT_101),
+        A.Normalize(mean=(0.485, 0.456, 0.406), std=(0.229, 0.224, 0.225)),
+        ToTensorV2(),
+    ])
+
+
+class PatchDataset(Dataset):
+    """Каталог: <root>/<class>/*.jpg, метки по имени папки."""
+
+    def __init__(self, root: Path, train: bool):
+        self.samples: list[tuple[Path, int]] = []
+        for cls, idx in CLASS_TO_IDX.items():
+            for f in (root / cls).glob("*.jpg"):
+                self.samples.append((f, idx))
+        if not self.samples:
+            raise RuntimeError(f"Нет патчей в {root}. Запустите prepare_data.py")
+        self.transform = build_transforms(train)
+
+    def __len__(self) -> int:
+        return len(self.samples)
+
+    def __getitem__(self, i: int):
+        path, label = self.samples[i]
+        img = imread_unicode(path)
+        img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
+        img = self.transform(image=img)["image"]
+        return img, label
+
+
+def make_loaders(batch_size: int = C.BATCH_SIZE, num_workers: int = C.NUM_WORKERS):
+    train_ds = PatchDataset(C.DATA_PATCHES / "train", train=True)
+    val_ds = PatchDataset(C.DATA_PATCHES / "val", train=False)
+
+    # балансировка классов через WeightedRandomSampler
+    labels = np.array([lbl for _, lbl in train_ds.samples])
+    class_counts = np.bincount(labels, minlength=2).astype(np.float32)
+    class_weights = 1.0 / np.maximum(class_counts, 1.0)
+    sample_weights = class_weights[labels]
+    sampler = WeightedRandomSampler(weights=sample_weights.tolist(),
+                                    num_samples=len(sample_weights),
+                                    replacement=True)
+
+    train_loader = DataLoader(train_ds, batch_size=batch_size, sampler=sampler,
+                              num_workers=num_workers, pin_memory=True, drop_last=False)
+    val_loader = DataLoader(val_ds, batch_size=batch_size, shuffle=False,
+                            num_workers=num_workers, pin_memory=True)
+    print(f"train: {len(train_ds)} (классы={class_counts.tolist()})  val: {len(val_ds)}")
+    return train_loader, val_loader