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Explain data frame analytics API

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Explains a data frame analytics config.

Request

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GET _ml/data_frame/analytics/_explain

POST _ml/data_frame/analytics/_explain

GET _ml/data_frame/analytics/<data_frame_analytics_id>/_explain

POST _ml/data_frame/analytics/<data_frame_analytics_id>/_explain

Prerequisites

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Requires the following privileges:

  • cluster: monitor_ml (the machine_learning_user built-in role grants this privilege)
  • source indices: read, view_index_metadata

Description

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This API provides explanations for a data frame analytics config that either exists already or one that has not been created yet. The following explanations are provided:

  • which fields are included or not in the analysis and why,
  • how much memory is estimated to be required. The estimate can be used when deciding the appropriate value for model_memory_limit setting later on.

If you have object fields or fields that are excluded via source filtering, they are not included in the explanation.

Path parameters

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<data_frame_analytics_id>
(Optional, string) Identifier for the data frame analytics job.

Request body

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A data frame analytics config as described in Create data frame analytics jobs. Note that id and dest don’t need to be provided in the context of this API.

Response body

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The API returns a response that contains the following:

field_selection

(array) An array of objects that explain selection for each field, sorted by the field names.

Properties of field_selection objects
is_included
(Boolean) Whether the field is selected to be included in the analysis.
is_required
(Boolean) Whether the field is required.
feature_type
(string) The feature type of this field for the analysis. May be categorical or numerical.
mapping_types
(string) The mapping types of the field.
name
(string) The field name.
reason
(string) The reason a field is not selected to be included in the analysis.
memory_estimation

(object) An object containing the memory estimates.

Properties of memory_estimation
expected_memory_with_disk
(string) Estimated memory usage under the assumption that overflowing to disk is allowed during data frame analytics. expected_memory_with_disk is usually smaller than expected_memory_without_disk as using disk allows to limit the main memory needed to perform data frame analytics.
expected_memory_without_disk
(string) Estimated memory usage under the assumption that the whole data frame analytics should happen in memory (i.e. without overflowing to disk).

Examples

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POST _ml/data_frame/analytics/_explain
{
  "source": {
    "index": "houses_sold_last_10_yrs"
  },
  "analysis": {
    "regression": {
      "dependent_variable": "price"
    }
  }
}

The API returns the following results:

{
  "field_selection": [
    {
      "field": "number_of_bedrooms",
      "mappings_types": ["integer"],
      "is_included": true,
      "is_required": false,
      "feature_type": "numerical"
    },
    {
      "field": "postcode",
      "mappings_types": ["text"],
      "is_included": false,
      "is_required": false,
      "reason": "[postcode.keyword] is preferred because it is aggregatable"
    },
    {
      "field": "postcode.keyword",
      "mappings_types": ["keyword"],
      "is_included": true,
      "is_required": false,
      "feature_type": "categorical"
    },
    {
      "field": "price",
      "mappings_types": ["float"],
      "is_included": true,
      "is_required": true,
      "feature_type": "numerical"
    }
  ],
  "memory_estimation": {
    "expected_memory_without_disk": "128MB",
    "expected_memory_with_disk": "32MB"
  }
}
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