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| # Copyright (c) Facebook, Inc. and its affiliates. | |
| 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. | |
| """ | |
| 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 | |
| def _do_register(cls, from_type: Type, converter: Any): | |
| cls.registry[from_type] = converter # pyre-ignore[16] | |
| 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: # pyre-ignore[16] | |
| 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 | |
| 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: # pyre-ignore[16] | |
| 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] | |