Invoking endpoint outputs empty prediction data

Question

Hello,

I am able to invoke my endpoint using the following command template: 
> aws --profile ‘insert_profile_name’ sagemaker-runtime invoke-endpoint --endpoint-name 'insert_endpoint_name' --body fileb://'insert_image_file_path' --region ‘insert_region’  --content-type application/x-image output.txt

However, this produces an output text file that contains the following:
> {prediction": []}

Also, this appears in the terminal after running the command:
> {
    "ContentType": "application/json",
    "InvokedProductionVariant": "variant-name-1"
}

The image I used to invoke my endpoint was also used for training the model.

Here is my training job configuration (values that I've modified or added):

> **Job Settings:**

> Algorithm - Object Detection | Input Mode - Pipe

> **Hyperparameters:**

> num_classes - 1 | mini_batch_size - 1 | num_training_samples - 1

> **Input data configuration:**

> *First channel:*

> *Second channel:*

Any help would be appreciated. I can provide more information if needed. Thanks!

Answer

Hello

Thank you for contacting us.

I understand that you are using the SageMaker Object Detection Algorithm for training and hosting your model and having issues while Invoking endpoint outputs empty prediction data, Please correct me If I am missing anything here.

From the Invocation script I see that you are using content-type  as application/x-image, from the documentation I see that the you can Query a trained model by using the model's endpoint and The endpoint takes .jpg and .png image formats with image/jpeg and image/png  as content-types.[1]

I would request you to test it out with the  ```ContentType="image/jpeg"``` and let us know if you are still facing the issue.  As an alternative you can test using the sagemaker runtime API call to invoke the endpoint.[2]

```endpoint_response = runtime.invoke_endpoint(EndpointName=ep, ContentType="image/jpeg", Body=b)```

For more details please refer to our GitHub example[2]

If you still have difficulties, I recommend to cut a support case and provide more detail about your account information and script/config. Due to security reason, we cannot discuss account specific issue in the public posts.

Thank you

References:
[1] https://docs.aws.amazon.com/sagemaker/latest/dg/object-detection-in-formats.html

[2] https://github.com/aws/amazon-sagemaker-examples/blob/main/introduction_to_amazon_algorithms/object_detection_birds/object_detection_birds.ipynb

Invoking endpoint outputs empty prediction data

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