AnnotationSpec

Container of information related to one possible annotation that can be used in a labeling task. For example, an image classification task where images are labeled as dog or cat must reference an AnnotationSpec for dog and an AnnotationSpec for cat.

JSON representation 
{
  "displayName": string,
  "description": string,
  "index": number
}
Fields
displayName

string

Required. The display name of the AnnotationSpec. Maximum of 64 characters.

description

string

Optional. User-provided description of the annotation specification. The description can be up to 10,000 characters long.

index

number

Output only. This is the integer index of the AnnotationSpec. The index for the whole AnnotationSpecSet is sequential starting from 0.

For example, an AnnotationSpecSet with classes dog and cat, might contain one AnnotationSpec with { displayName: "dog", index: 0 } and one AnnotationSpec with { displayName: "cat", index: 1 }.

This is especially useful for model training as it encodes the string labels into numeric values.