OpenSearch/docs/reference/ml/df-analytics/apis/evaluate-dfanalytics.asciidoc

[role="xpack"]
[testenv="platinum"]
[[evaluate-dfanalytics]]
=== Evaluate {dfanalytics} API

[subs="attributes"]
++++
<titleabbrev>Evaluate {dfanalytics}</titleabbrev>
++++

Evaluates the {dfanalytics} for an annotated index.

experimental[]

[[ml-evaluate-dfanalytics-request]]
==== {api-request-title}

`POST _ml/data_frame/_evaluate`

[[ml-evaluate-dfanalytics-prereq]]
==== {api-prereq-title}

* You must have `monitor_ml` privilege to use this API. For more 
information, see {stack-ov}/security-privileges.html[Security privileges] and 
{stack-ov}/built-in-roles.html[Built-in roles].

[[ml-evaluate-dfanalytics-desc]]
==== {api-description-title}

This API evaluates the executed analysis on an index that is already annotated
with a field that contains the results of the analytics (the `ground truth`)
for each {dataframe} row.

Evaluation is typically done by calculating a set of metrics that capture various aspects of the quality of the results over the data for which you have the
`ground truth`.

For different types of analyses different metrics are suitable. This API
packages together commonly used metrics for various analyses.

[[ml-evaluate-dfanalytics-request-body]]
==== {api-request-body-title}

`index`::
  (Required, object) Defines the `index` in which the evaluation will be
  performed.

`query`::
  (Optional, object) Query used to select data from the index.
  The {es} query domain-specific language (DSL). This value corresponds to the query
  object in an {es} search POST body. By default, this property has the following
  value: `{"match_all": {}}`.

`evaluation`::
  (Required, object) Defines the type of evaluation you want to perform. For example: 
  `binary_soft_classification`. See <<ml-evaluate-dfanalytics-resources>>.
  
////
[[ml-evaluate-dfanalytics-results]]
==== {api-response-body-title}

`binary_soft_classification`::
  (object) If you chose to do binary soft classification, the API returns the
  following evaluation metrics:
  
`auc_roc`::: TBD

`confusion_matrix`::: TBD
  
`precision`::: TBD

`recall`::: TBD
////

[[ml-evaluate-dfanalytics-example]]
==== {api-examples-title}

[source,console]
--------------------------------------------------
POST _ml/data_frame/_evaluate
{
  "index": "my_analytics_dest_index",
  "evaluation": {
    "binary_soft_classification": {
      "actual_field": "is_outlier",
      "predicted_probability_field": "ml.outlier_score"
    }
  }
}
--------------------------------------------------
// TEST[skip:TBD]

The API returns the following results:

[source,console-result]
----
{
  "binary_soft_classification": {
    "auc_roc": {
      "score": 0.92584757746414444
    },
    "confusion_matrix": {
      "0.25": {
          "tp": 5,
          "fp": 9,
          "tn": 204,
          "fn": 5
      },
      "0.5": {
          "tp": 1,
          "fp": 5,
          "tn": 208,
          "fn": 9
      },
      "0.75": {
          "tp": 0,
          "fp": 4,
          "tn": 209,
          "fn": 10
      }
    },
    "precision": {
        "0.25": 0.35714285714285715,
        "0.5": 0.16666666666666666,
        "0.75": 0
    },
    "recall": {
        "0.25": 0.5,
        "0.5": 0.1,
        "0.75": 0
    }
  }
}
----