Media Server 25.4
Media Server Help

# ListObjectClassRecognizers

Lists the recognizers that exist in the training database for use with object class recognition.

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`trainingoptions` | A Boolean value (default false) that specifies whether to return the training options set for each recognizer. | No

## Example

    /action=ListObjectClassRecognizers

## Response

The response includes a list of recognizers, with the following information:

- `recognizer` - the name of the recognizer.

- `state` - describes the state of the recognizer.

  - `TRAINED` - the recognizer has been trained and is ready to use.
  - `TRAINING` - training is in progress.
  - `SNAPSHOTTED` - the recognizer has been trained but a snapshot should be selected. You can use the recognizer in this state (Media Server uses the model with the greatest number of iterations). You can evaluate a snapshot with the action TestObjectClassRecognizerSnapshot followed by GetObjectClassRecognizerSnapshotStatistics. You can then select the snapshot to use by running SelectObjectClassRecognizerSnapshot, which moves the recognizer to the `TRAINED` state. For more information about snapshots, see Training Requirements and Create and Train a Recognizer.
  - `STALE` - the recognizer requires training. You can begin training with the action BuildObjectClassRecognizer.
  - `PAUSED` - training has been paused by the action PauseBuildObjectClassRecognizer. You cannot use the recognizer in this state. Resume training by running the action BuildObjectClassRecognizer.
- `numclasses` - the number of object classes that exist in the recognizer.
- `remaining_iterations` - the number of training iterations that are remaining. This element is present only when training is paused.
- `snapshots` - lists the snapshots that were generated during training. A snapshot captures the state of a recognizer after a certain number of iterations.
- `trainingoptions` - shows the training options that are associated with the recognizer. This element is present only when you set the action parameter `trainingoptions=true`, and have set one or more training options with the action SetObjectClassRecognizerTrainingOption.

    <autnresponse>
        <action>LISTOBJECTCLASSRECOGNIZERS</action>
        <response>SUCCESS</response>
        <responsedata>
            <recognizer>
                <recognizer>vehicles</recognizer>
                <state>SNAPSHOTTED</state>
                <numclasses>3</numclasses>
                <snapshots>
                    <snapshot>
                        <index>0</index>
                        <iterations>1500</iterations>
                    </snapshot>
                    <snapshot>
                        <index>1</index>
                        <iterations>500</iterations>
                    </snapshot>
                    <snapshot>
                        <index>2</index>
                        <iterations>1000</iterations>
                    </snapshot>
                </snapshots>
                <trainingoptions>
                    <trainingoption>
                        <key>iterations</key>
                        <value>1500</value>
                    </trainingoption>
                    <trainingoption>
                        <key>snapshot_frequency</key>
                        <value>500</value>
                    </trainingoption>
                </trainingoptions>
            </recognizer>
        </responsedata>
    </autnresponse>

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Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery Media Server 25.4

Topic Title: ListObjectClassRecognizers