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