AWS personalize get-recommendations bug

Question

Hello everyone. I have a problem with the get-recommendations response. For example:

Input data (`utf-8 encoding`):
```
{'ItemId': '1', 'properties': '{'description': 'random string\nnext line '}'}
```

Output data (using the  get-recommendations method):
```
{'ItemId': 'next line', 'score': 0.1}
```
So, in my example, I get broken string instead `ItemId`.

1. What is a problem can be? How can I fix it?
2. Is it possible that `
` or similar symbols can break the response of this method and return some broken string instead?

Answer

The GetRecommendations API request and response payload you shared above does not match the [API definition](https://docs.aws.amazon.com/personalize/latest/dg/API_RS_GetRecommendations.html). Are you using a language SDK or calling the Personalize endpoint directly?

If making a REST call directly to the Personalize campaign/recommender endpoint, the request payload should be in the following format.

```json
{
   "campaignArn": "string",
   "context": { 
      "string" : "string" 
   },
   "filterArn": "string",
   "filterValues": { 
      "string" : "string" 
   },
   "itemId": "string",
   "numResults": number,
   "recommenderArn": "string",
   "userId": "string"
}
```

If using a language SDK like the AWS SDK for Python, the request parameters are passed as arguments to a function that wraps the REST call.

```python
import boto3

personalizeRt = boto3.client('personalize-runtime')

response = personalizeRt.get_recommendations(
    campaignArn = 'Campaign ARN',
    userId = 'User ID',
    numResults = 10
)

print("Recommended items")
for item in response['itemList']:
    print (item['itemId'])
```

See examples [here](https://docs.aws.amazon.com/personalize/latest/dg/recommendations.html#get-recommendations-sdk-example).

AWS personalize get-recommendations bug

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