Guidelines and Limits
Guidelines
Amazon Comprehend is available in the following regions:
| Region Name | Region | Endpoint | Protocol |
|---|---|---|---|
| US East (Ohio) | us-east-2 | https://comprehend.us-east-2.amazonaws.com | HTTPS |
| US East (N. Virginia) | us-east-1 | https://comprehend.us-east-1.amazonaws.com | HTTPS |
| US West (Oregon) | us-west-2 | https://comprehend.us-west-2.amazonaws.com | HTTPS |
| EU (Ireland) | eu-west-1 | https://comprehend.eu-west-1.amazonaws.com | HTTPS |
Limits
Amazon Comprehend has the following limits:
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Documents submitted for topic detection using the StartTopicsDetectionJob operation must be UTF-8 encoded text files.
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The maximum document size is 5,000 bytes of UTF-8 encoded characters.
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The maximum number of documents for the BatchDetectDominantLanguage, BatchDetectEntities, BatchDetectKeyPhrases, and BatchDetectSentiment operations is 25 documents per request.
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The BatchDetectDominantLanguage and DetectDominantLanguage operations have the following limitations:
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They don't support phonetic language detection. For example, they will not detect "arigato" as Japanese, nor "nihao" as Chinese.
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They may have trouble distinguishing close language pairs, such as Indonesian and Malay; or Bosnian, Croatian, and Serbian.
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For best results, the input text should be at least 20 characters long.
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Topic detection jobs created with the StartTopicsDetectionJob operation have the following limits:
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For best results, you should include at least 1,000 input documents.
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The maximum number of topics to return can't exceed 100.
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The total size of all files in the request can't exceed 1 Gb.
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The total size of a single file in the request can't exceed 2 Mb.
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When you are using one document per file, you can send a maximum of 50,000 files.
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When you are using one document per line, you can send a maximum of 1,000,000 lines.
To request a service limit increase, see https://aws.amazon.com/support..
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