Azure Custom Vision Api POST Request error, even correct ID's

Question

I'm trying to publish my Custom Vision Iteration after I trained it. But I always get a "Bad Request" Error.

I'm trying with the following line of code:

trainingApi.PublishIteration(ProjectID, iteration.Id, "Model", predictionResourceId);

It should Publish my Iteration but I just get an error.

I re-checked all my ID's but everything looks fine. Has the model name be something specific (start with lower letter or something)?

Edit:

I tried it now with a POST Request in Postman but now I receive:

{
    "code": "BadRequestInvalidPublishTarget",
    "message": "Invalid prediction resource id"
}

But I re-checked my Prediction Resource ID and it's correct.

Edit 2:

I thin I put the wrong thing into predictionId in the POST request, I just put in a ID but I think it should have been the /subscriptions/... part like described by microsoft. The problem now is:

{
    "code": "BadRequestInvalidPublishTarget",
    "message": "Invalid prediction id, please pass a prediction resource id."
}

For me this means it doesn't receive a prediction resource id, but I'm lost so I'm out of ideas what the problem could be.

Edit 3:

I forgot to add my POST Request:

https://xxx.cognitiveservices.azure.com/customvision/v3.0/training/projects/xxx/
iterations/xxx/publish?publishName=Model&predictionId=/subscriptions/xxx/
resourceGroups/CustomVision/providers/Microsoft.CognitiveServices/accounts/xxx

Answer 1

Publish using POST request

If you want to ensure that you have the right syntax, you can check using Custom vision portal by doing the same steps.

For example when I try to publish an iteration of a project, I can see the following call in the console:

https://westeurope.api.cognitive.microsoft.com/customvision/v3.3/Training/projects/ID_OF_MY_PROJECT/iterations/ID_OF_MY_ITERATION/publish?predictionId=%2Fsubscriptions%2FID_OF_MY_AZURE_SUBSCRIPTION%2FresourceGroups%2FNAME_OF_MY_RESOURCE_GROUP%2Fproviders%2FMicrosoft.CognitiveServices%2Faccounts%2FNAME_OF_MY_CUSTOM_VISION_PREDICTION_RESOURCE&publishName=NAME_OF_MY_ITERATION

Demo:

So yes, the "publicationId" value is looking like the one you mentioned but you have to encode the value of this string.

So change this:

predictionId=/subscriptions/xxx/
resourceGroups/CustomVision/providers/Microsoft.CognitiveServices/accounts/xxx

to

predictionId=%2Fsubscriptions%2Fxxx%2F
resourceGroups%2FCustomVision%2Fproviders%2FMicrosoft.CognitiveServices%2Faccounts%2Fxxx

in your call.

And be careful to use a prediction resource, not a training one.

---

Publish using C#

Here is a demo using C# and the official Custom Vision package hosted on Nuget (here)

using System;
using Microsoft.Azure.CognitiveServices.Vision.CustomVision.Training;

namespace so65714960
{
    class Program
    {
        private static CustomVisionTrainingClient _trainingClient;

        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");

            _trainingClient = new CustomVisionTrainingClient(new ApiKeyServiceClientCredentials("PUT_YOUR_TRAINING_KEY_HERE"));
            // I'm specifying my endpoint here as I'm working on West Europe region
            _trainingClient.Endpoint = "https://westeurope.api.cognitive.microsoft.com/";

            var projectId = new Guid("4b...a5"); // Put your Project Id here
            var iterationId = new Guid("9d...e"); // Put your iteration Id here

            // Get iteration information
            var targetIteration = _trainingClient.GetIteration(projectId, iterationId);
            Console.WriteLine($"Iteration publish resource Id: '{targetIteration.OriginalPublishResourceId}'");

            // If originalPublishResourceId is not null, it is already published
            // For this demo purpose, we unpublish first to publish again after if it is already published
            if (!string.IsNullOrWhiteSpace(targetIteration.OriginalPublishResourceId))
            {
                _trainingClient.UnpublishIteration(projectId, iterationId);

                // Force status refresh
                targetIteration = _trainingClient.GetIteration(projectId, iterationId);
                Console.WriteLine($"Iteration publish resource Id after unpublish: '{targetIteration.OriginalPublishResourceId}'");
            }

            // Publish
            var publicationResourceId = "/subscriptions/7c...e8/resourceGroups/Cognitive_Demo/providers/Microsoft.CognitiveServices/accounts/NRO-Cognitive-CustomVision-WestEurope-Prediction-S0";
            var publication = _trainingClient.PublishIteration(projectId, iterationId, "Publication1", publicationResourceId);
            
            // Force status refresh
            targetIteration = _trainingClient.GetIteration(projectId, iterationId);
            Console.WriteLine($"Iteration publish resource Id after publish: '{targetIteration.OriginalPublishResourceId}'");
        }
    }
}

See my Azure resource used: