A grayscale PNG file that stores integer values (label pixel_value in [annotation spec](#annotation_definitions) reference table, semantic segmentation) of the labeled object at each pixel.
A grayscale PNG file that stores integer values (label pixel_value in [annotation spec](#annotation_definitionsjson) reference table, semantic segmentation) of the labeled object at each pixel.
![image alt text](image_2.png)
A json file that stores collections of metric specifications records (metric_definition).
Each specification record describes a particular metric stored in [metrics](#metrics) values.
Each metric_definition record is assigned a unique identifier to a collection of specification records, which is stored as a list of key-value pairs.
The design is very similar to [annotation_definitions](#annotation_definitions.json).
The design is very similar to [annotation_definitions](#annotation_definitionsjson).