Troubleshooting List Type Plugin Not Recognizing Semantic Type

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It appears you're encountering an issue where your list type plugin isn't being recognized and is returning a null semantic type. This can be frustrating, but let's systematically troubleshoot the problem. We'll review your configuration, code, and the overall process to identify the root cause.

Understanding the Problem

The core issue is that despite adding a list type plugin to your CustomPlugins.json file and updating your SamplePlugin.java to use it, the output shows a null semantic type. This indicates that the Text Analyzer isn't correctly identifying the input strings based on your plugin's definition. Let's delve into the details to pinpoint the problem.

Analyzing the Configuration

First, let's examine your CustomPlugins.json configuration. This file is crucial as it tells the Text Analyzer how to recognize your custom semantic types. Here's the JSON you've provided:

{
 "semanticType": "CUSTOM.INVENTORY_STATUS",
 "description": "Enum: 'In Stock', 'Backordered', 'Out of Stock'.",
 "pluginType": "list",
 "validLocales": [ {
 "localeTag": "en"
 } ],
 "threshold": 95,
 "content": {
 "type": "resource",
 "reference": "/inventory_status.csv"
 },
 "documentation": [
 { "source": "", "reference": "" }
 ],
 "backout": "[ \\p{IsAlphabetic}]+"
}

Let's break down each key aspect of this configuration:

  • semanticType: CUSTOM.INVENTORY_STATUS - This is the unique identifier for your semantic type. It's essential to ensure this matches the type you're referencing in your Java code.
  • description: Enum: 'In Stock', 'Backordered', 'Out of Stock'. - This provides a human-readable description of the semantic type, which is helpful for documentation and understanding.
  • pluginType: list - This correctly specifies that you're using a list type plugin, which means the analyzer will compare input strings against a predefined list of values.
  • validLocales: [ { "localeTag": "en" } ] - This indicates that the plugin is valid for the English locale. This is important for the analyzer to use the correct plugin based on the locale.
  • threshold: 95 - This is a crucial parameter. It represents the minimum confidence score (as a percentage) required for the analyzer to recognize a semantic type. If the analyzer's confidence is below this threshold, it won't assign the semantic type. A high threshold might lead to missed detections if the input doesn't perfectly match the list.
  • content: { "type": "resource", "reference": "/inventory_status.csv" } - This section defines the source of the list values. You're using a resource type, which means the list will be loaded from a file. The reference points to /inventory_status.csv, indicating the CSV file's location relative to the resources directory.
  • documentation: [ { "source": "", "reference": "" } ] - This is for documentation purposes and doesn't affect the plugin's functionality.
  • backout: [ \\p{IsAlphabetic}]+ - This regular expression defines a pattern for backing out of a semantic type classification. In this case, it backs out if the input consists solely of alphabetic characters. It’s important to ensure this backout pattern doesn’t unintentionally exclude valid inputs.

Key Considerations for CustomPlugins.json

  1. Semantic Type Consistency: Double-check that the semanticType in CustomPlugins.json exactly matches the one you're using in your SamplePlugin.java code.
  2. File Path: The reference path in the content section is crucial. If the path is incorrect, the analyzer won't be able to load the list values. Ensure that /inventory_status.csv is the correct relative path to your CSV file.
  3. Threshold Value: The threshold of 95 is quite high. If the analyzer's confidence score is slightly below this, the semantic type won't be recognized. Consider lowering it temporarily to see if it resolves the issue, but be mindful of potential false positives.
  4. Backout Pattern: The backout pattern should be carefully considered. While it aims to prevent misclassification, it could inadvertently exclude valid inputs. Review it to ensure it aligns with your intended behavior.

Examining the CSV File

The inventory_status.csv file contains the list of valid values for the INVENTORY_STATUS semantic type. Let's look at the content you provided:

In Stock
Backordered
Out of Stock

The critical point here is the case sensitivity and spacing. The values in your CSV file are