Struct CocoIndex 

pub struct CocoIndex {
    pub images: HashMap<u64, CocoImage>,
    pub categories: HashMap<u32, CocoCategory>,
    pub label_indices: HashMap<u32, u64>,
    pub annotations_by_image: HashMap<u64, Vec<CocoAnnotation>>,
}

Lookup tables for efficient COCO data access.

Builds indexes from a CocoDataset for O(1) lookups.

Fields

images: HashMap<u64, CocoImage>

image_id → CocoImage

categories: HashMap<u32, CocoCategory>

category_id → CocoCategory

label_indices: HashMap<u32, u64>

category_id → label_index (0-based, alphabetical order by name)

annotations_by_image: HashMap<u64, Vec<CocoAnnotation>>

image_id → Vec<CocoAnnotation>

Implementations

impl CocoIndex

pub fn from_dataset(dataset: &CocoDataset) -> Self

Build lookup index from a CocoDataset.

Creates efficient lookup tables for accessing images, categories, and annotations by their IDs.

pub fn label_name(&self, category_id: u32) -> Option<&str>

Get the label name for a category ID.

pub fn label_index(&self, category_id: u32) -> Option<u64>

Get the label index for a category ID.

pub fn annotations_for_image(&self, image_id: u64) -> &[CocoAnnotation]

Get annotations for an image.

Trait Implementations

impl Clone for CocoIndex

fn clone(&self) -> CocoIndex

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CocoIndex

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.