| |
|
|
| from typing import Any, Tuple, Type |
| import torch |
|
|
|
|
| class BaseConverter: |
| """ |
| Converter base class to be reused by various converters. |
| Converter allows one to convert data from various source types to a particular |
| destination type. Each source type needs to register its converter. The |
| registration for each source type is valid for all descendants of that type. |
| """ |
|
|
| @classmethod |
| def register(cls, from_type: Type, converter: Any = None): |
| """ |
| Registers a converter for the specified type. |
| Can be used as a decorator (if converter is None), or called as a method. |
| |
| Args: |
| from_type (type): type to register the converter for; |
| all instances of this type will use the same converter |
| converter (callable): converter to be registered for the given |
| type; if None, this method is assumed to be a decorator for the converter |
| """ |
|
|
| if converter is not None: |
| cls._do_register(from_type, converter) |
|
|
| def wrapper(converter: Any) -> Any: |
| cls._do_register(from_type, converter) |
| return converter |
|
|
| return wrapper |
|
|
| @classmethod |
| def _do_register(cls, from_type: Type, converter: Any): |
| cls.registry[from_type] = converter |
|
|
| @classmethod |
| def _lookup_converter(cls, from_type: Type) -> Any: |
| """ |
| Perform recursive lookup for the given type |
| to find registered converter. If a converter was found for some base |
| class, it gets registered for this class to save on further lookups. |
| |
| Args: |
| from_type: type for which to find a converter |
| Return: |
| callable or None - registered converter or None |
| if no suitable entry was found in the registry |
| """ |
| if from_type in cls.registry: |
| return cls.registry[from_type] |
| for base in from_type.__bases__: |
| converter = cls._lookup_converter(base) |
| if converter is not None: |
| cls._do_register(from_type, converter) |
| return converter |
| return None |
|
|
| @classmethod |
| def convert(cls, instance: Any, *args, **kwargs): |
| """ |
| Convert an instance to the destination type using some registered |
| converter. Does recursive lookup for base classes, so there's no need |
| for explicit registration for derived classes. |
| |
| Args: |
| instance: source instance to convert to the destination type |
| Return: |
| An instance of the destination type obtained from the source instance |
| Raises KeyError, if no suitable converter found |
| """ |
| instance_type = type(instance) |
| converter = cls._lookup_converter(instance_type) |
| if converter is None: |
| if cls.dst_type is None: |
| output_type_str = "itself" |
| else: |
| output_type_str = cls.dst_type |
| raise KeyError(f"Could not find converter from {instance_type} to {output_type_str}") |
| return converter(instance, *args, **kwargs) |
|
|
|
|
| IntTupleBox = Tuple[int, int, int, int] |
|
|
|
|
| def make_int_box(box: torch.Tensor) -> IntTupleBox: |
| int_box = [0, 0, 0, 0] |
| int_box[0], int_box[1], int_box[2], int_box[3] = tuple(box.long().tolist()) |
| return int_box[0], int_box[1], int_box[2], int_box[3] |
|
|
