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vllm.utils.jsontree

Helper functions to work with nested JSON structures.

JSONTree module-attribute 

JSONTree: TypeAlias = (
    dict[str, "JSONTree[_T]"]
    | list["JSONTree[_T]"]
    | tuple["JSONTree[_T]", ...]
    | _T
)

A nested JSON structure where the leaves need not be JSON-serializable.

_JSONTree module-attribute 

_JSONTree: TypeAlias = (
    dict[str, "JSONTree[_T]"]
    | list["JSONTree[_T]"]
    | tuple["JSONTree[_T]", ...]
    | dict[str, _T]
    | list[_T]
    | tuple[_T, ...]
    | _T
)

Same as JSONTree but with additional Union members to satisfy overloads.

_T module-attribute 

_T = TypeVar('_T')

_U module-attribute 

_U = TypeVar('_U')

json_count_leaves 

json_count_leaves(value: JSONTree[_T]) -> int

Count the number of leaves in a nested JSON structure.

Source code in vllm/utils/jsontree.py 
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def json_count_leaves(value: JSONTree[_T]) -> int:
    """Count the number of leaves in a nested JSON structure."""
    return sum(1 for _ in json_iter_leaves(value))

json_iter_leaves 

json_iter_leaves(value: JSONTree[_T]) -> Iterable[_T]

Iterate through each leaf in a nested JSON structure.

Source code in vllm/utils/jsontree.py 
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def json_iter_leaves(value: JSONTree[_T]) -> Iterable[_T]:
    """Iterate through each leaf in a nested JSON structure."""
    if isinstance(value, dict):
        for v in value.values():
            yield from json_iter_leaves(v)
    elif isinstance(value, (list, tuple)):
        for v in value:
            yield from json_iter_leaves(v)
    else:
        yield value

json_map_leaves 

json_map_leaves(
    func: Callable[[Tensor], Tensor],
    value: BatchedTensorInputs,
) -> BatchedTensorInputs

json_map_leaves(
    func: Callable[[_T], _U], value: _T | dict[str, _T]
) -> _U | dict[str, _U]

json_map_leaves(
    func: Callable[[_T], _U], value: _T | list[_T]
) -> _U | list[_U]

json_map_leaves(
    func: Callable[[_T], _U], value: _T | tuple[_T, ...]
) -> _U | tuple[_U, ...]

json_map_leaves(
    func: Callable[[_T], _U], value: JSONTree[_T]
) -> JSONTree[_U]

json_map_leaves(
    func: Callable[[_T], _U],
    value: BatchedTensorInputs | _JSONTree[_T],
) -> BatchedTensorInputs | _JSONTree[_U]

Apply a function to each leaf in a nested JSON structure.

Source code in vllm/utils/jsontree.py 
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def json_map_leaves(
    func: Callable[[_T], _U],
    value: "BatchedTensorInputs" | _JSONTree[_T],
) -> "BatchedTensorInputs" | _JSONTree[_U]:
    """Apply a function to each leaf in a nested JSON structure."""
    if isinstance(value, dict):
        return {
            k: json_map_leaves(func, v)  # type: ignore[arg-type]
            for k, v in value.items()
        }
    elif isinstance(value, list):
        return [json_map_leaves(func, v) for v in value]
    elif isinstance(value, tuple):
        return tuple(json_map_leaves(func, v) for v in value)
    else:
        return func(value)

json_reduce_leaves 

json_reduce_leaves(
    func: Callable[[_T, _T], _T], value: _T | dict[str, _T]
) -> _T

json_reduce_leaves(
    func: Callable[[_T, _T], _T], value: _T | list[_T]
) -> _T

json_reduce_leaves(
    func: Callable[[_T, _T], _T], value: _T | tuple[_T, ...]
) -> _T

json_reduce_leaves(
    func: Callable[[_T, _T], _T], value: JSONTree[_T]
) -> _T

json_reduce_leaves(
    func: Callable[[_U, _T], _U],
    value: JSONTree[_T],
    initial: _U,
) -> _U

json_reduce_leaves(
    func: Callable[..., _T | _U],
    value: _JSONTree[_T],
    initial: _U = cast(_U, ...),
) -> _T | _U

Apply a function of two arguments cumulatively to each leaf in a nested JSON structure, from left to right, so as to reduce the sequence to a single value.

Source code in vllm/utils/jsontree.py 
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def json_reduce_leaves(
    func: Callable[..., _T | _U],
    value: _JSONTree[_T],
    initial: _U = cast(_U, ...),  # noqa: B008
    /,
) -> _T | _U:
    """
    Apply a function of two arguments cumulatively to each leaf in a
    nested JSON structure, from left to right, so as to reduce the
    sequence to a single value.
    """
    if initial is ...:
        return reduce(func, json_iter_leaves(value))  # type: ignore[arg-type]

    return reduce(
        func,  # type: ignore[arg-type]
        json_iter_leaves(value),
        initial,
    )