Find deduplication key and ID in your output data

You can see the deduplication key and ID in your output data. The deduplication key is identified by dataset-objectid-attribute-name. When you use your own custom deduplication key, your output contains something similar to the following:

"dataset-objectid-attribute-name": "byo-key",
"byo-key": "UniqueId",

When you do not specify a key, you can find the deduplication ID that Ground Truth assigned to your data object as follows. The $label-attribute-name-object-id parameter identifies your deduplication ID.

{
    "source-ref":"s3://bucket/prefix/object1", 
    "dataset-objectid-attribute-name":"$label-attribute-name-object-id"
    "label-attribute-name" :0,
    "label-attribute-name-metadata": {...},
    "$label-attribute-name-object-id":"<service-generated-key>"
}

For <service-generated-key>, if the data object came through an Amazon S3 configuration, Ground Truth adds a unique value used by the service and emits a new field keyed by $sequencer which shows the Amazon S3 sequencer used. If object was fed to SNS directly, Ground Truth use the SNS message ID.