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+# Registry Pattern
+
+## Overview
+
+The Registry pattern allows components to register themselves via decorators, enabling automatic discovery and centralized management of available types.
+
+## Structure
+
+```python
+# In module __init__.py (e.g., data_module/dataset/__init__.py)
+from typing import Dict, Callable, TypeVar
+
+T = TypeVar('T')
+
+DATASET_FACTORY: Dict[str, type] = {}
+
+def register_dataset(name: str) -> Callable[[T], T]:
+    """Decorator to register dataset classes."""
+    def decorator(cls: T) -> T:
+        DATASET_FACTORY[name] = cls
+        return cls
+    return decorator
+```
+
+## Usage
+
+```python
+# In implementation file (e.g., simple_dataset.py)
+from data_module.dataset import register_dataset
+
+@register_dataset("simple")
+class SimpleDataset(Dataset):
+    def __init__(self, cfg):
+        # Implementation
+        pass
+```
+
+## Benefits
+
+- **Automatic registration**: Components register themselves on import
+- **Declarative**: Single decorator line replaces manual registration code
+- **Import-time discovery**: Auto-import pattern finds all implementations
+- **Type-safe**: Preserves original class type
+
+## Implementation Details
+
+1. Decorator returns the class unchanged (for immediate use)
+2. Side effect: adds class to factory dict
+3. Name parameter must be unique per module
+4. Registration happens at module import time
+
+## Advanced Patterns
+
+### Registration with Config
+
+```python
+def register_model(name: str):
+    def decorator(cls):
+        MODEL_FACTORY[name] = cls
+        # Add config validation
+        cls._config_schema = getattr(cls, '_config_schema', {})
+        return cls
+    return decorator
+```
+
+### Conditional Registration
+
+```python
+def register_dataset(name: str, experimental: bool = False):
+    def decorator(cls):
+        if not experimental or cfg.enable_experimental:
+            DATASET_FACTORY[name] = cls
+        return cls
+    return decorator
+```
+
+### Multi-Registry
+
+```python
+# Multiple registries in one module
+DATASET_FACTORY = {}
+AUGMENTATION_FACTORY = {}
+
+def register_dataset(name: str):
+    def decorator(cls):
+        DATASET_FACTORY[name] = cls
+        return cls
+    return decorator
+
+def register_augmentation(name: str):
+    def decorator(fn):
+        AUGMENTATION_FACTORY[name] = fn
+        return fn
+    return decorator
+```
+
+## Best Practices
+
+- **Unique names**: Use descriptive, unique registration names
+- **Documentation**: Document required parameters in class docstring
+- **Validation**: Validate config in `__init__`, not in decorator
+- **Consistency**: Use same naming convention across modules