# DescribeProjectVersions
Lists and describes the versions of an Amazon Rekognition project. You can specify up to 10 model or adapter versions in `ProjectVersionArns`. If you don't specify a value, descriptions for all model/adapter versions in the project are returned.
This operation requires permissions to perform the `rekognition:DescribeProjectVersions` action.
## Request Syntax
```
{
"MaxResults": number,
"NextToken": "string",
"ProjectArn": "string",
"VersionNames": [ "string" ]
}
```
## Request Parameters
For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).
The request accepts the following data in JSON format.
** [MaxResults](#API_DescribeProjectVersions_RequestSyntax) **
The maximum number of results to return per paginated call. The largest value you can specify is 100. If you specify a value greater than 100, a ValidationException error occurs. The default value is 100.
Type: Integer
Valid Range: Minimum value of 1. Maximum value of 100.
Required: No
** [NextToken](#API_DescribeProjectVersions_RequestSyntax) **
If the previous response was incomplete (because there is more results to retrieve), Amazon Rekognition returns a pagination token in the response. You can use this pagination token to retrieve the next set of results.
Type: String
Length Constraints: Maximum length of 1024.
Required: No
** [ProjectArn](#API_DescribeProjectVersions_RequestSyntax) **
The Amazon Resource Name (ARN) of the project that contains the model/adapter you want to describe.
Type: String
Length Constraints: Minimum length of 20. Maximum length of 2048.
Pattern: `(^arn:[a-z\d-]+:rekognition:[a-z\d-]+:\d{12}:project\/[a-zA-Z0-9_.\-]{1,255}\/[0-9]+$)`
Required: Yes
** [VersionNames](#API_DescribeProjectVersions_RequestSyntax) **
A list of model or project version names that you want to describe. You can add up to 10 model or project version names to the list. If you don't specify a value, all project version descriptions are returned. A version name is part of a project version ARN. For example, `my-model.2020-01-21T09.10.15` is the version name in the following ARN. `arn:aws:rekognition:us-east-1:123456789012:project/getting-started/version/my-model.2020-01-21T09.10.15/1234567890123`.
Type: Array of strings
Array Members: Minimum number of 1 item. Maximum number of 10 items.
Length Constraints: Minimum length of 1. Maximum length of 255.
Pattern: `[a-zA-Z0-9_.\-]+`
Required: No
## Response Syntax
```
{
"NextToken": "string",
"ProjectVersionDescriptions": [
{
"BaseModelVersion": "string",
"BillableTrainingTimeInSeconds": number,
"CreationTimestamp": number,
"EvaluationResult": {
"F1Score": number,
"Summary": {
"S3Object": {
"Bucket": "string",
"Name": "string",
"Version": "string"
}
}
},
"Feature": "string",
"FeatureConfig": {
"ContentModeration": {
"ConfidenceThreshold": number
}
},
"KmsKeyId": "string",
"ManifestSummary": {
"S3Object": {
"Bucket": "string",
"Name": "string",
"Version": "string"
}
},
"MaxInferenceUnits": number,
"MinInferenceUnits": number,
"OutputConfig": {
"S3Bucket": "string",
"S3KeyPrefix": "string"
},
"ProjectVersionArn": "string",
"SourceProjectVersionArn": "string",
"Status": "string",
"StatusMessage": "string",
"TestingDataResult": {
"Input": {
"Assets": [
{
"GroundTruthManifest": {
"S3Object": {
"Bucket": "string",
"Name": "string",
"Version": "string"
}
}
}
],
"AutoCreate": boolean
},
"Output": {
"Assets": [
{
"GroundTruthManifest": {
"S3Object": {
"Bucket": "string",
"Name": "string",
"Version": "string"
}
}
}
],
"AutoCreate": boolean
},
"Validation": {
"Assets": [
{
"GroundTruthManifest": {
"S3Object": {
"Bucket": "string",
"Name": "string",
"Version": "string"
}
}
}
]
}
},
"TrainingDataResult": {
"Input": {
"Assets": [
{
"GroundTruthManifest": {
"S3Object": {
"Bucket": "string",
"Name": "string",
"Version": "string"
}
}
}
]
},
"Output": {
"Assets": [
{
"GroundTruthManifest": {
"S3Object": {
"Bucket": "string",
"Name": "string",
"Version": "string"
}
}
}
]
},
"Validation": {
"Assets": [
{
"GroundTruthManifest": {
"S3Object": {
"Bucket": "string",
"Name": "string",
"Version": "string"
}
}
}
]
}
},
"TrainingEndTimestamp": number,
"VersionDescription": "string"
}
]
}
```
## Response Elements
If the action is successful, the service sends back an HTTP 200 response.
The following data is returned in JSON format by the service.
** [NextToken](#API_DescribeProjectVersions_ResponseSyntax) **
If the previous response was incomplete (because there is more results to retrieve), Amazon Rekognition returns a pagination token in the response. You can use this pagination token to retrieve the next set of results.
Type: String
Length Constraints: Maximum length of 1024.
** [ProjectVersionDescriptions](#API_DescribeProjectVersions_ResponseSyntax) **
A list of project version descriptions. The list is sorted by the creation date and time of the project versions, latest to earliest.
Type: Array of [ProjectVersionDescription](API_ProjectVersionDescription.md) objects
## Errors
For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).
** AccessDeniedException **
You are not authorized to perform the action.
HTTP Status Code: 400
** InternalServerError **
Amazon Rekognition experienced a service issue. Try your call again.
HTTP Status Code: 500
** InvalidPaginationTokenException **
Pagination token in the request is not valid.
HTTP Status Code: 400
** InvalidParameterException **
Input parameter violated a constraint. Validate your parameter before calling the API operation again.
HTTP Status Code: 400
** ProvisionedThroughputExceededException **
The number of requests exceeded your throughput limit. If you want to increase this limit, contact Amazon Rekognition.
HTTP Status Code: 400
** ResourceNotFoundException **
The resource specified in the request cannot be found.
HTTP Status Code: 400
** ThrottlingException **
Amazon Rekognition is temporarily unable to process the request. Try your call again.
HTTP Status Code: 500
## See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following:
+ [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/rekognition-2016-06-27/DescribeProjectVersions)
+ [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/rekognition-2016-06-27/DescribeProjectVersions)