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# AWS::Wisdom::KnowledgeBase SemanticChunkingConfiguration
<a name="aws-properties-wisdom-knowledgebase-semanticchunkingconfiguration"></a>

Settings for semantic document chunking for a data source. Semantic chunking splits a document into smaller documents based on groups of similar content derived from the text with natural language processing.

## Syntax
<a name="aws-properties-wisdom-knowledgebase-semanticchunkingconfiguration-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-wisdom-knowledgebase-semanticchunkingconfiguration-syntax.json"></a>

```
{
  "[BreakpointPercentileThreshold](#cfn-wisdom-knowledgebase-semanticchunkingconfiguration-breakpointpercentilethreshold)" : Number,
  "[BufferSize](#cfn-wisdom-knowledgebase-semanticchunkingconfiguration-buffersize)" : Number,
  "[MaxTokens](#cfn-wisdom-knowledgebase-semanticchunkingconfiguration-maxtokens)" : Number
}
```

### YAML
<a name="aws-properties-wisdom-knowledgebase-semanticchunkingconfiguration-syntax.yaml"></a>

```
  [BreakpointPercentileThreshold](#cfn-wisdom-knowledgebase-semanticchunkingconfiguration-breakpointpercentilethreshold): Number
  [BufferSize](#cfn-wisdom-knowledgebase-semanticchunkingconfiguration-buffersize): Number
  [MaxTokens](#cfn-wisdom-knowledgebase-semanticchunkingconfiguration-maxtokens): Number
```

## Properties
<a name="aws-properties-wisdom-knowledgebase-semanticchunkingconfiguration-properties"></a>

`BreakpointPercentileThreshold`  <a name="cfn-wisdom-knowledgebase-semanticchunkingconfiguration-breakpointpercentilethreshold"></a>
The dissimilarity threshold for splitting chunks.  
*Required*: Yes  
*Type*: Number  
*Minimum*: `50`  
*Maximum*: `99`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`BufferSize`  <a name="cfn-wisdom-knowledgebase-semanticchunkingconfiguration-buffersize"></a>
The buffer size.  
*Required*: Yes  
*Type*: Number  
*Minimum*: `0`  
*Maximum*: `1`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`MaxTokens`  <a name="cfn-wisdom-knowledgebase-semanticchunkingconfiguration-maxtokens"></a>
The maximum number of tokens that a chunk can contain.  
*Required*: Yes  
*Type*: Number  
*Minimum*: `1`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)