predictor.classify_image failed with error "Invalid iteration"

Samike 21

I've created and trained an image classification model using Azure Custom Vision (Cognitive Services) and published the model with API. Now, I've written a simple code in Python which takes an image from my local file and calls the API. However, I'm still getting this error even though the Iteration surely exists:

azure.cognitiveservices.vision.customvision.prediction.models._models_py3.CustomVisionErrorException: Invalid iteration

My code:

ENDPOINT = "https://northeurope.api.cognitive.microsoft.com/"
PROJECT_ID = "my project id"
prediction_key = "my prediction key"

prediction_credentials = ApiKeyCredentials(in_headers={"Prediction-key": prediction_key})
predictor = CustomVisionPredictionClient(ENDPOINT, prediction_credentials)

image_location = "/tmp/123.jpg"
publish_iteration_name = "Iteration2"

with open(image_location, "rb") as image_contents:
    results = predictor.classify_image(
        PROJECT_ID, publish_iteration_name, image_contents.read())

GiftA-MSFT 11,171 Reputation points

2021-02-26T17:56:31.2+00:00

Hi, thanks for reaching out. Can you ensure that your training and prediction resources are located in the same region?
Samike 21 Reputation points

2021-02-26T19:20:17.373+00:00

Yes, I have verified that my training and prediction resources are located in the same region)
Curiously, the C# app from this prediction example works fine without errors!
GiftA-MSFT 11,171 Reputation points

2021-03-02T02:48:00.563+00:00

Can you please let us know if you're still experiencing this issue. Wondering if it was an intermittent issue. Otherwise, can you please share your region so we can investigate further? Thanks!
Samike 21 Reputation points

2021-03-02T06:19:59.14+00:00

Yes, I am still experiencing this problem.
I'm using the C# example now, the python example (shown in first post) does not work.
My region (endpoint): https://northeurope.api.cognitive.microsoft.com/
Thanks!
GiftA-MSFT 11,171 Reputation points

2021-03-02T15:16:59.427+00:00

Just to confirm, are you saying the C# example works but python example doesn't? Or both don't work?
Samike 21 Reputation points

2021-03-02T19:54:55.12+00:00

Yes, C# example works fine but python example doesn't work

Accepted answer

GiftA-MSFT 11,171 Reputation points

2021-03-10T22:05:49.007+00:00
The classificationType shows null, meaning that you created an object detection model. Please follow this example instead to test your model. It should be predictor.detect_image() instead of predictor.classify_image(). Hope this helps!

# Open the sample image and get back the prediction results. with open(base_image_location + "images/Test/test_od_image.jpg", mode="rb") as test_data: results = predictor.detect_image(project.id, publish_iteration_name, test_data)
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1 person found this answer helpful.
Samike 21 Reputation points

2021-03-11T07:33:25.213+00:00

Great, it works!!!
Thanx!
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2 additional answers

Zhuohong Xie 5 Reputation points

2024-11-30T20:53:58.8966667+00:00

I had a similar issue with Microsoft Learn training. Later I found that I did not use the correct model name as in the tutorial, when publishing the model. Once the model name matched the one in the .env python file, the code ran smoothly.
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1 person found this answer helpful.
MIN THEIN WIN 5 Reputation points

2024-12-09T01:03:56.83+00:00

I got the same error. This answer helps me, @Zhuohong Xie thanks you save my time.
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GiftA-MSFT 11,171 Reputation points

2021-03-08T21:48:20.113+00:00

Hi, the error has to do with the publish name. Ensure that you are entering a valid publish name that you specified when publishing the model. You can retrieve the publish name using the GetIterations API. If you're following this example, the publish name would be publish_iteration_name = "classifyModel". Hope this helps.
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Samike 21 Reputation points

2021-03-09T10:22:43.327+00:00

Hi, I tried GetIterations API, I entered projectId and Training-key and got "publishName": "Iteration2". Now if I enter projectId and "publishName" in my python script (in predictor.classify_image()), I get the error: Invalid project type for operation.
Thanks for the help, but I rewrote the code from python to C# (see my post number 2), I'm not sure if I can fix it in python example.

GiftA-MSFT 11,171 Reputation points

2021-03-09T15:19:25.353+00:00

Can you ensure that you've entered the correct ENDPOINT found in Azure Portal > Custom Vision Resource > Keys and Endpoint?

Samike 21 Reputation points

2021-03-10T07:16:26.337+00:00

Yes, ENDPOINT I take from Azure Portal > Custom Vision Resource > Keys and Endpoint (see screenshot):

GiftA-MSFT 11,171 Reputation points

2021-03-10T18:11:06.673+00:00

When you created your resource(s), did you select Kind as Cognitive Services or did you create Training and Prediction separately?

GiftA-MSFT 11,171 Reputation points

2021-03-10T19:27:15.223+00:00

I think I may have uncovered the issue, will share updates soon. Thanks.

Samike 21 Reputation points

2021-03-10T19:58:39.677+00:00

Unfortunately, I don't remember very well how I did (

GiftA-MSFT 11,171 Reputation points

2021-03-10T20:17:00.84+00:00

From GetIterations API, does it show "classificationType": "Multilabel"? Also, can you ensure again that you entered the projectId and publishName shown in the results (and not id and name)? Thanks.

Samike 21 Reputation points

2021-03-10T20:20:44.403+00:00

As for python example:
I did all points from the example using the Azure web interface and only the last point (Test the prediction endpoint) I did using the python script...
Basically, I solved my problem using an C# example (as you see, it differs from python example), but if there is an opportunity to figure out why the python example does not work for me - please creating a support request for further analysis on root cause.
Thanx.

Samike 21 Reputation points

2021-03-10T20:30:47.377+00:00

From GetIterations API:
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predictor.classify_image failed with error "Invalid iteration"

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