---
title: Create and manage a Dynamic Navigation Experience (DNE) model
slug: '3396'
canonical_url: https://docs.coveo.com/en/3396/
collection: leverage-machine-learning
source_format: adoc
---
# Create and manage a Dynamic Navigation Experience (DNE) model

To effectively rank [facets](https://docs.coveo.com/en/198/) and facet values, a Coveo Machine Learning (ML) [DNE](https://docs.coveo.com/en/2907/) model learns from [Coveo Analytics events](https://docs.coveo.com/en/260/), such as search and click events in which end users interacted with facets and obtained the desired result [items](https://docs.coveo.com/en/210/).
Therefore, the more the model learns from facet-related actions performed by your end users, the more effectively it can rank facets and provide relevant search results.

> **Important**
>
> A [Coveo Machine Learning (Coveo ML)](https://docs.coveo.com/en/188/) [Dynamic Navigation Experience (DNE)](https://docs.coveo.com/en/2907/) [model](https://docs.coveo.com/en/1012/) requires dynamic facets.
> If your search interface uses the [Coveo JavaScript Search Framework](https://docs.coveo.com/en/187/), [DNE](https://docs.coveo.com/en/2907/) doesn't support regular facets.
> For more information, see [Configure dynamic facets in your search interface](https://docs.coveo.com/en/2918/).

## Create a DNE model

. On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page of the [Coveo Administration Console](https://docs.coveo.com/en/183/), click **Add model**, and then click the **Dynamic Navigation Experience** card.

. Click **Next**.

. (Optional) In the [**Learning interval**](#learning-interval-section) section, you can change the default and recommended values for both **Data period** and **Building frequency**.

. Click **Next**.

. (Optional) In the **Apply filters on dataset** section, you can add filters to refine the data that the model uses to make its recommendations.
By narrowing down the dataset that a model uses, you can better customize relevancy for specific user groups and use cases.
You can apply filters on all events, or on every event that belongs to a specific category, such as search, click, view, or custom events.

**Example**

Depending on the search interfaces in which the model is used, you want your DNE model to learn differently.
Therefore, you add a filter on the **Origin 1 (Page/Hub)** dimension.

.. In the **Select a dimension** dropdown menu, select the dimension on which you want to base the learning of the model.

.. In the **Select an operator** dropdown menu, select the appropriate operator.

.. In the **Select value(s)** dropdown menu, add, type, or select the appropriate value.

.. You can optionally add other filters by clicking **Add**.

. Click **Next**.

. (Optional) To enable value autoselection in a facet, in the [**Facet Autoselect**](#facet-autoselect-section) section, select the corresponding facet [fields](https://docs.coveo.com/en/200/).

--
> **Important**
>
> You won't be able to enable or edit the **Facet Autoselect** feature once the DNE model is created.

> **Note**
>
> If your Coveo organization includes [multiple indexes](https://docs.coveo.com/en/2877/), this feature supports only the fields of sources that are linked to the default index.
--

. Click **Next**.

. In the **Name your model** input, enter a meaningful display name for the model.

. (Optional) Use the **Project** selector to associate your model with one or more [projects](https://docs.coveo.com/en/n7ef0517/).

. Click **Start building**.

> **Note**
>
> On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page, under the **Status** column, in the model row, the value is most probably **Inactive**.
> 
> The model value will change to **Active** when the model creation is complete (typically within 30 minutes, depending on the amount of usage analytics data to process).
> The model can only return recommendations when its status is **Active**.
> 
> For more information on Coveo ML model statuses, see the [**Status** column reference](#status-column).

. (Optional) Configure [advanced settings](#advanced-configuration) for your model.

. [Associate the model with a pipeline](https://docs.coveo.com/en/l1qf4156/) to use the [model](https://docs.coveo.com/en/1012/) in a [search interface](https://docs.coveo.com/en/2741/) and [test your model](https://docs.coveo.com/en/mc2g0297#test-your-dne-model) to make sure it behaves as expected.

> **Important**
>
> Make sure to follow the [model association leading practices](https://docs.coveo.com/en/l1qf4156#leading-practices) before associating your model with your production query pipeline.

## Advanced configuration

You can configure advanced settings for your [model](https://docs.coveo.com/en/1012/) to suit specific use cases.

Some advanced settings are available from the [model](https://docs.coveo.com/en/1012/) options in the [Administration Console](https://docs.coveo.com/en/183/), while others are only available through JSON configuration parameters.

> **Notes**
>
> * Additional model configurations can be specified through the [Advanced Model Configuration API](https://docs.coveo.com/en/l3od9093/).
> 
> * You can also use the [`mlParameters` query parameter](https://docs.coveo.com/en/13#operation/searchUsingPost-mlParameters) to adjust the way your Coveo ML models are used at query time.

To specify advanced settings

. On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page, click the model for which you want to specify advanced settings.

. Do one of the following:

* To specify an advanced setting using an [Administration Console](https://docs.coveo.com/en/183/) [model](https://docs.coveo.com/en/1012/) option:

.. Click **Edit** in the Action bar.

.. Click the **Advanced** tab, and then in the **Advanced** page left menu, select the setting to configure:

** [Suggestion filters](#suggestion-filters)
** [Test configuration mode](#test-configuration-mode)

* To specify an advanced setting using a JSON parameter:

.. In the Action bar, click **More**, and then click **Edit JSON**.

.. Enter the advanced parameter configuration in the JSON's `extraConfig` object:

** [`filterFields`](#filterfields-list-of-strings)

[start=3]
. Click **Save**.

## Manage a DNE model

You can edit using the [model options](#edit-a-dne-model) or [JSON](#edit-a-dne-model-json-configuration), [delete](#delete-a-dne-model), or [review information](#review-model-information) for your [model](https://docs.coveo.com/en/1012/).

### Edit a DNE model

. On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page, click the model you want to edit, and then click **Edit** in the Action bar.

. On the subpage that opens, select the **Configuration** tab.

. Under **Name**, you can optionally edit the model's display name.

. (Optional) Use the **Project** selector to associate your model with one or more [projects](https://docs.coveo.com/en/n7ef0517/).

. (Optional) In the [**Learning interval**](#learning-interval-section) section, you can change the default and recommended **Data period** and **Building frequency**.

. (Optional) In the **Apply filters on dataset** section, you can add filters to refine the data that the model uses to make its recommendations.
By narrowing down the dataset that a model uses, you can better customize relevancy for specific user groups and use cases.
You can apply filters on all events, or on every event that belongs to a specific category, such as search, click, view, or custom events.

**Example**

Depending on the search interfaces in which the model is used, you want your DNE model to learn differently.
Therefore, you add a filter on the **Origin 1 (Page/Hub)** dimension.

.. In the **Select a dimension** dropdown menu, select the dimension on which you want to base the learning of the model.

.. In the **Select an operator** dropdown menu, select the appropriate operator.

.. In the **Select value(s)** dropdown menu, add, type, or select the appropriate value.

.. You can optionally add other filters by clicking **Add**.

. Click **Save**.

. On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page, under the **Status** column, in the model row, the value is most probably **Updating**.

> **Note**
>
> The model value will change to **Active** when the model edition is complete (typically within 30 minutes, depending on the amount of usage analytics data to process).
> The model can only return recommendations when its status is **Active**.
> 
> For more information on Coveo ML model statuses, see the [**Status** column reference](#status-column).

. [Associate the model with a pipeline](https://docs.coveo.com/en/l1qf4156/) to use the [model](https://docs.coveo.com/en/1012/) in a [search interface](https://docs.coveo.com/en/2741/) and [test your model](https://docs.coveo.com/en/mc2g0297#test-your-dne-model) to make sure it behaves as expected.

> **Important**
>
> Make sure to follow the [model association leading practices](https://docs.coveo.com/en/l1qf4156#leading-practices) before associating your model with your production query pipeline.

### Edit a DNE model JSON configuration

. Access the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page.

. Click the desired model, and then click **More** > **Edit JSON** in the Action bar.

. In the **Edit a Model JSON Configuration** panel that appears, modify the existing model configuration:


```json
{
  "modelDisplayName": "<MODEL_DISPLAY_NAME>",
  "exportPeriod": "<EXPORT_PERIOD>",
  "intervalTime": <INTERVAL_TIME>,
  "intervalUnit": "<INTERVAL_UNIT>",
  "commonFilter": "<COMMON_FILTER>",
  "customEventFilter": "<CUSTOM_EVENT_FILTER>",
  "exportOffset": "<EXPORT_OFF_SET>",
  "searchEventFilter": "<SEARCH_EVENT_FILTER>",
  "viewEventFilter": "<VIEW_EVENT_FILTER>",
  "extraConfig": [<ADVANCED_ML_PARAMETERS>],
}
```


Where:


* `modelDisplayName` (string) is the name of the model appearing on the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page.

* `exportPeriod` (ISO-8601 string, _required_) is the period defining the age of the [Coveo Analytics data](https://docs.coveo.com/en/259/) used to build the model.
Must be in the ISO8601 period format (that is, `PyYmMwWdDThHmMsS`).

> **Note**
>
> Unless an [`exportOffset`](https://docs.coveo.com/en/3397#exportoffset) is specified, the `exportPeriod` uses the moment when the model was generated as a base.
* `intervalTime` (integer, _required_) is the number of `intervalUnit` (that is, `DAY`, `WEEK`, or `MONTH`) between each update of the model.
Must be between `1` and `30` inclusively.

* `intervalUnit` (string enum, _required_) is the duration unit of the interval between each update of the model.
See `intervalTime`.
Accepted values are: `DAY`, `WEEK`, and `MONTH`.

* `commonFilter` (string) is the filter to apply to the common event dimensions (shared by all event types) in the export. Multiple filter parameters are joined with the `AND` operator.

* `customEventFilter` (string) is the filter to apply to the custom event dimensions in the export. Multiple filter parameters are joined with the `AND` operator.

* [[exportoffset]] `exportOffset` (ISO-8601 string) is the offset of the usage analytics data used to build the model.
Must be in the ISO8601 period format (that is, `PyYmMwWdDThHmMsS`).
The default value is `PT0S`, meaning that all events are considered when building a model (the `exportPeriod` is based on the moment the model was generated).

**Example**

You want to ignore events that occur on the current day, so you set the `exportOffset` value to `P1D`.

* `searchEventFilter` (string) is the filter to apply to the click and search event dimensions in the export. Multiple filter parameters are joined with the `AND` operator.

* `viewEventFilter` (string) is the filter to apply to the view event dimensions (shared by all event types) in the export. Multiple filter parameters are joined with the `AND` operator.

* `extraConfig` (array of string) are additional [advanced parameters](#advanced-json-model-parameters) used to tailor the model to your use case.

. Click **Save** to apply your changes.

### Delete a DNE model

> **Note**
>
> If the model is associated with a query pipeline, make sure to dissociate the model from the query pipeline after deleting it.

. On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page, click the ML model that you want to delete, and then click **More** > **Delete** in the Action bar.

. In the panel that appears, click **Delete**.

### Review model information

On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page, click the desired model, and then click **View** in the Action bar.
For more information, see [Reviewing model information](https://docs.coveo.com/en/1894/).

## Reference

### DNE models reference

* Default number of expanded facets: 4
* Default number of displayed values in expanded facets: 8

While you can change both values, it's not recommended and requires developer skills.

### Advanced model options

#### Suggestion filters

Use the **Suggestion filters** advanced setting to set the [Coveo Analytics](https://docs.coveo.com/en/182/) dimensions to be used as filters for potential suggestions.

The [model](https://docs.coveo.com/en/1012/) filters the suggestions so that only the interaction data from events that include the specified dimensions are considered.

By default, the **Search hub** and **Tab** dimensions are selected.
This means that for a [query](https://docs.coveo.com/en/231/) that originates from a specific tab in a [search hub](https://docs.coveo.com/en/1342/), only interactions recorded in the same [search hub](https://docs.coveo.com/en/1342/) tab will be used by the [model](https://docs.coveo.com/en/1012/).

**Example**

Given the default values of **Search hub** and **tab**, and the following implementation:

* Two **Search hub** values: `partnerHub` and `techSupportHub`

* Four **Tab** values: `all`, `documentation`, `training`, and `community`

A total of eight possible filters will be created ( `partnerHub`/`all`, `techSupportHub`/`all`, `partnerHub`/`documentation`, etc.).
This means that if a query originates from `partnerHub`/`all`, only interactions recorded in `partnerHub`/`all` will be used by the [model](https://docs.coveo.com/en/1012/) to make suggestions for that query.

You can set this option to use the recommended **Search hub** and **Tab** dimensions (default), to not use filters at all, or to use custom filters based on dimensions of your choice.

To configure the suggestion filters

. On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page, click the model that you want to modify, and then click **Edit** in the Action bar.

. On the subpage that opens, select the **Advanced** tab.

. In the left menu of the **Advanced** tab, select **Suggestion filters**.

. Choose one of the following options:

** **Search hub and Tab** (default): The model uses the **Search hub** and **Tab** dimensions as filters for suggestions.

** **No dimension filters**: The model doesn't use any filters for suggestions.
This provides the same relevance across all search hubs that use the model.
It's useful when your model serves different search hubs in which the same source items are available.

** **Custom filters**: The model uses the dimensions that you select as filters for suggestions.

.. **Optionally**, select one or both of the **Search hub** and **Tab** filters.

.. Under **Other dimensions**, select the dimensions you want to use to filter the model suggestions (for example, `country` and `language`).

> **Important**
>
> If you set a dimension other than the two default ones (**Search Hub** and **Tab**), you must also add the dimension at query time using the `filters` [mlParameter](https://docs.coveo.com/en/13#operation/searchUsingPost-mlParameters).

![Custom filters configuration](https://docs.coveo.com/en/assets/images/leverage-machine-learning/ml-custom-dimension-filters.png)

. Click **Save**.

#### Test configuration mode

> **Note**
>
> The **Test configuration mode** advanced option is available only for sandbox organizations.

[Sandbox organizations](https://docs.coveo.com/en/2959#sandbox-organization) typically lack the amount of usage analytics data that's required to train a model.
The **Test configuration mode** option lets you build a model in a sandbox organization with little or infrequent usage analytics data so you can test the model.

When activated, this option reduces the amount of analytics data that's required to build the model.
It also reduces other frequency thresholds that discard queries or clicks that weren't performed frequently enough.

> **Note**
>
> The usage of certain frequency thresholds, or the selection of a specific value for these frequency thresholds depends on the configuration and implementation of the model.
> As the possible combinations of threshold configurations are adapted for each model, these frequency thresholds aren't listed in this section.

To activate the test configuration mode

. On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page, click the model for which you want to activate the test configuration mode, and then click **Edit** in the Action bar.

. On the subpage that opens, select the **Advanced** tab.

. In the left menu of the **Advanced** tab, select **Test configuration mode**.

. Select the **Activate test configuration mode** checkbox.

. Click **Save**.

### Advanced JSON model parameters

#### `filterFields` (list of strings)

Use this parameter to set the [Coveo Analytics](https://docs.coveo.com/en/182/) dimensions to be used as filters for potential suggestions.

The [model](https://docs.coveo.com/en/1012/) filters the suggestions so that only the interaction data from events that include the specified dimensions are considered.

**Default**: `["originLevel1", "originLevel2"]`.

> **Note**
>
> Given the default value of `["originLevel1", "originLevel2"]`, and the following implementation:
> 
> * Two `originLevel1` values: `partnerHub` and `techSupportHub`
> 
> * Four `originLevel2` values: `all`, `documentation`, `training`, and `community`
> 
> A total of eight possible filters will be created ( `partnerHub`/`all`, `techSupportHub`/`all`, `partnerHub`/`documentation`, etc.).
> This means that if a query originates from `partnerHub`/`all`, only interactions recorded in `partnerHub`/`all` will be used by the [model](https://docs.coveo.com/en/1012/) to make suggestions for that query.

> **Important**
>
> If you set a field other than the two default ones (`originLevel1` and `originLevel2`), you must also add the field at query time using the `filters` [mlParameter](https://docs.coveo.com/en/13#operation/searchUsingPost-mlParameters).

To set the parameter

[Access the model's JSON editor](#advanced-configuration), and then add the parameter configuration to the `extraConfig` object.

**Example**

You want your ML model to consider the possible value combination of the `originContext` and `originLevel2` dimensions when filtering results because some of the results are not available in some other combinations.

Therefore, you enter the following configuration in the `extraConfig` object:

```json
"extraConfig": {
    "filterFields": [
      "originContext",
      "originLevel2"
    ]
}
```

This would require sending the dimension values at query time in the `filters` [mlParameter](https://docs.coveo.com/en/13#operation/searchUsingPost-mlParameters/) as follows:

```json
"mlParameters": {
    "filters": {
          "originContext": "<MY-CONTEXT-VALUE>",
          "originLevel2": "<TAB-VALUE>"
    }
}
```

Moreover, you may want to build a model that doesn't use filters at all since all items are accessible everywhere.
You can do so by setting the `filterFields` parameter to empty in a model configuration.
This allows you to provide the same relevance across all search hubs using the model.

For example:

```json
"extraConfig": {
    "filterFields": []
}
```

### "Status" column

On the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page of the [Administration Console](https://docs.coveo.com/en/183/), the **Status** column indicates the current state of your Coveo ML models.

The following table lists the possible model statuses and their definitions:

[%header,cols="1,6,^.^1"]
|===
.^|Status
.^|Definition
|Status icon

|Active
|The model is active and available.
a|![Active](leverage-machine-learning/model-active.png)

|Build in progress
|The model is currently building.
a|![Building](leverage-machine-learning/model-build.png)

|Inactive
|The model isn't ready to be queried, such as when a model was recently created or the organization is offline.  
Click **See more details** for additional information (see [Review model information](https://docs.coveo.com/en/1894/)).
a|![Inactive](leverage-machine-learning/model-limited.png)

|Limited
|Build issues exist that may affect model performance.  
Click **See more details** for additional information (see [Review model information](https://docs.coveo.com/en/1894/)).
a|![Limited](leverage-machine-learning/model-limited.png)

|Soon to be archived
|The model will soon be archived because it hasn't been queried for an extended period of time.  
Click **Delete** to remove the model.  
[Learn more about archived models](https://docs.coveo.com/en/mb3e0324/).
a|![Archive pending](leverage-machine-learning/model-limited.png)

|Error
|An error prevented the model from being built successfully.  
If it's a temporary system error, check back soon.
Otherwise, click **See more details** for additional information (see [Review model information](https://docs.coveo.com/en/1894/)).
a|![Error](leverage-machine-learning/model-error.png)

|Archived
|The model was archived because it hasn't been queried for an extended period of time.  
Click **Delete** to remove the model.  
[Learn more about archived models](https://docs.coveo.com/en/mb3e0324/).
a|![Archived](leverage-machine-learning/model-archived.png)
|===

### "Learning Interval" section

In this section, you can modify the following:

* [[data-period]]**Data period**: The usage analytics data time interval on which the model will be based.
* **Building frequency**: The rate at which the model is retrained.

Set the Coveo ML model training **Building frequency** based on the **Data Period** value. Less frequent for a larger **Data Period** and more frequent for a smaller **Data Period** as recommended in the following table.

[cols="^3,^1,^1,^1"]
|===
.2+.^h|**Data period**
3+h|**Building frequency**

h|Daily
h|Weekly
h|Monthly

|1 month
|[check]
|[check]
|

|3 months (Recommended)
|
|[check]
|

|6 months
|
|
|[check]
|===

The more data the model has access to and learns from, the better the recommendations. As a general guide, a usage analytics dataset of 10,000 [queries](https://docs.coveo.com/en/231/) or more typically allows a Coveo ML model to provide very relevant recommendations. You can look at your [Coveo Analytics](https://docs.coveo.com/en/182/) data to evaluate the volume of queries on your search hub, and ensure that your Coveo ML models are configured with a training **Data period** that corresponds to at least 10,000 queries. When your [search hub](https://docs.coveo.com/en/1342/) serves a very high volume of queries, you can consider reducing the data period so that the model learns only more recent user behavior and be more responsive to trends.

A Coveo ML model regularly retrains on a more recent Coveo UA dataset, as determined by the **Building frequency** and **Data period** settings, to ensure that the model remains up-to-date with the most recent user behavior.

> **Note**
>
> If you're testing the model in a sandbox environment in which very little analytics data is available to train the model, you can activate the **Test configuration mode** [advanced option](#test-configuration-mode) to ensure the model provides recommendations.

### "Facet Autoselect" section

When enabled, the **Facet Autoselect** feature automatically selects facet values according to the user query.
The feature learns from a user's behavior to understand which categories are the most relevant according to the user's current browsing task.

The **Facet Autoselect** section lets you choose the facet fields to which the automatic selection of facet values should apply.

> **Important**
>
> You won't be able to enable or edit the **Facet Autoselect** feature once the DNE model is created.

To enable the automatic selection of facet values:

. In the **Select facet fields** dropdown menu, select the facet fields for which the automatic selection of values should apply.

. In the **Associated sources** section, do one of the following:

** Select **All** to take all sources into account for the selected fields.

** Select **Specific** to take only certain sources into account for the selected fields.
You can then deselect undesired sources.

> **Note**
>
> If your Coveo organization includes [multiple indexes](https://docs.coveo.com/en/2877/), this feature supports only the fields of sources that are linked to the default index.

> **Note**
>
> The greater the number of items associated with the selections made in the **Select facet fields** dropdown menu and **Associated sources** section, the longer the model will take to build.

## Required privileges

By default, members with the [required privileges](https://docs.coveo.com/en/1832#required-privileges) can view and edit elements of the [**Models**](https://platform.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) ([platform-ca](https://platform-ca.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-eu](https://platform-eu.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/) | [platform-au](https://platform-au.cloud.coveo.com/admin/#/orgid/ai-and-ml/models/)) page.

The following table indicates the privileges required to use elements of the **Models** page and associated panels (see [Manage privileges](https://docs.coveo.com/en/3151/) and [Privilege reference](https://docs.coveo.com/en/1707/)).

[cols="3",options="header"]
|===
|Action
|Service - Domain
|Required access level

|View models
|Machine Learning - Models  
Organization - Organization  
Search - Query pipelines
|View

.2+|Edit models
|Organization - Organization  
Search - Query pipelines
|View

|Machine Learning - Models
|Edit
|===