Trying to access API via end point for Azure Vision AI results in resource not found for image prediction

Question

Trying to access API via end point for Azure Vision AI results in resource not found for image prediction

Kenneth Zhang 0

Am trying to classify image using vision ai and the prediction end point, however it came up as "not found"Operation returned an invalid status code 'NotFound'

string predictionEndpoint = "https://visionkennyai-prediction.cognitiveservices.azure.com/customvision/v3.0/Prediction/376a473b-1158-4a74-9059-3c2b0bee2cbb/classify/iterations/HemlockPredictionAPI/image";

the training end point seems to work fine but the prediction end point isn't.

JAYA SHANKAR G S 2,430 Reputation points Microsoft External Staff

2025-03-14T15:02:42.67+00:00
Hi Kenneth Zhang,

Please add below details,

More details on error like a snippet and how you made a request, vis Rest API or sdk?

when you created this custom model?

which version you used version 4 or 3.2?

Thank you
Kenneth Zhang 0 Reputation points

2025-03-15T18:25:34.3266667+00:00

Visual studio, using nuget. Azure.CognitiveServices.Vision.CustomVision.Prediction v2.0.0.0 . Custom model was created yesterday.

Kenneth Zhang 0

This is actually as per the Microsoft example. Doesn't work straight out of the box. Which is really annoying

private static void TestIteration(CustomVisionPredictionClient predictionApi, Project project)

{

// Make a prediction against the new project

Console.WriteLine("Making a prediction:");



var result = predictionApi.ClassifyImage(project.Id, publishedModelName, testImage);

// Loop over each prediction and write out the results

foreach (var c in result.Predictions)

{

    Console.WriteLine($"\t{c.TagName}: {c.Probability:P1}");

}

}

predictionApi fails.

1 answer

Your answer

JAYA SHANKAR G S 2,430 Reputation points Microsoft External Staff

2025-03-14T15:02:42.67+00:00

Hi Kenneth Zhang,

Please add below details,

More details on error like a snippet and how you made a request, vis Rest API or sdk?

when you created this custom model?

which version you used version 4 or 3.2?

Thank you
Kenneth Zhang 0 Reputation points

2025-03-15T18:25:34.3266667+00:00

Visual studio, using nuget. Azure.CognitiveServices.Vision.CustomVision.Prediction v2.0.0.0 . Custom model was created yesterday.
Kenneth Zhang 0 Reputation points

2025-03-15T18:26:53.07+00:00

This is actually as per the Microsoft example. Doesn't work straight out of the box. Which is really annoying

private static void TestIteration(CustomVisionPredictionClient predictionApi, Project project)

{

// Make a prediction against the new project Console.WriteLine("Making a prediction:"); var result = predictionApi.ClassifyImage(project.Id, publishedModelName, testImage); // Loop over each prediction and write out the results foreach (var c in result.Predictions) { Console.WriteLine($"\t{c.TagName}: {c.Probability:P1}"); }

}

predictionApi fails.

Answer 1

JAYA SHANKAR G S 2,430 Microsoft External Staff

Hi @Kenneth Zhang ,

When you create a custom vision resource you will be creating two resources, one training and other prediction.

enter image description here

You need to get the keys and endpoint from Keys and Endpoint pages, under Resource Management like mentioned here from both training and prediction resource.

Training resource

enter image description here

Prediction resource

enter image description here

So, in your case it's just

string predictionEndpoint = "https://visionkennyai-prediction.cognitiveservices.azure.com"

Please try above and let me know if you have any query.

UPDATE

Issue: Using prediction endpoint in C# sdk giving error Operation returned an invalid status code 'NotFound'

Solution: Replacing the default model name with published model name resolved the issues.

Thank you

Kenneth Zhang 0 Reputation points

2025-03-17T14:04:54.3366667+00:00

Hi, no, when I created a custom vision resource, there is only ONE resource. I thought by publishing will I then get the endpoint as per the prediction URL
See image. So no, I can't see any access to the prediction custom vision resource as per your snapshot?
Kenneth Zhang 0 Reputation points

2025-03-17T14:21:04.44+00:00

Ok, seems like this was the issue. First there's a bug within Azure, the second resource VisionKennyAI-Prediction did not appear until I've created another Vision AI resource.

I think the main mistake was me not changing the default model name in the example, "treeClassModel" to the "HemlockPredictionAPI" which is stated as "Published as:".. it wasn't obvious that I should provide the model name.

Anyway it's resolved now. Many thanks
JAYA SHANKAR G S 2,430 Reputation points Microsoft External Staff

2025-03-18T04:58:49.3+00:00

Hi @Kenneth Zhang ,

Since you cannot accept your own answer, I am updating it in my answer so that it helps community to find better solution.

And regarding resource creation, while creating it you will get option to select prediction and training, here you need to select both then you will get both resources.

I believe you selected only training earlier while creating custom vision resource.

Please do accept it and give feedback by clicking on Yes.

Thank you

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Trying to access API via end point for Azure Vision AI results in resource not found for image prediction

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