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[ML] specifying missing_field_value value and using it instead of empty_string (#53108) (#53165) 

For analytics, we need a consistent way of indicating when a value is missing. Inheriting from anomaly detection, analysis sent `""` when a field is missing. This works fine with numbers, but the underlying analytics process actually treats `""` as a category in categorical values. 

Consequently, you end up with this situation in the resulting model
```
{
              "frequency_encoding" : {
                "field" : "RainToday",
                "feature_name" : "RainToday_frequency",
                "frequency_map" : {
                  "" : 0.009844409027270245,
                  "No" : 0.6472019970785184,
                  "Yes" : 0.6472019970785184
                }
              }
            }
```
For inference this is a problem, because inference will treat missing values as `null`. And thus not include them on the infer call against the model.

This PR takes advantage of our new `missing_field_value` option and supplies `\0` as the value.
This commit is contained in:
Benjamin Trent 2020-03-05 09:50:52 -05:00 committed by GitHub
parent 48707ec55a
commit 181ee3ae0b
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4 changed files with 8 additions and 7 deletions
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4
x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/dataframe/extractor/DataFrameDataExtractor.java
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@ -52,7 +52,7 @@ public class DataFrameDataExtractor {
private static final Logger LOGGER = LogManager.getLogger(DataFrameDataExtractor.class);
private static final TimeValue SCROLL_TIMEOUT = new TimeValue(30, TimeUnit.MINUTES);
private static final String EMPTY_STRING = "";
public static final String NULL_VALUE = "\0";
private final Client client;
private final DataFrameDataExtractorContext context;
@ -189,7 +189,7 @@ public class DataFrameDataExtractor {
} else {
if (values.length == 0 && context.includeRowsWithMissingValues) {
// if values is empty then it means it's a missing value
extractedValues[i] = EMPTY_STRING;
extractedValues[i] = NULL_VALUE;
} else {
// we are here if we have a missing value but the analysis does not support those
// or the value type is not supported (e.g. arrays, etc.)

5
x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/dataframe/process/customprocessing/DatasetSplittingCustomProcessor.java
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@ -6,6 +6,7 @@
package org.elasticsearch.xpack.ml.dataframe.process.customprocessing;
import org.elasticsearch.xpack.core.ml.utils.ExceptionsHelper;
import org.elasticsearch.xpack.ml.dataframe.extractor.DataFrameDataExtractor;
import java.util.List;
import java.util.Random;
@ -18,8 +19,6 @@ import java.util.Random;
*/
class DatasetSplittingCustomProcessor implements CustomProcessor {
private static final String EMPTY = "";
private final int dependentVariableIndex;
private final double trainingPercent;
private final Random random;
@ -47,7 +46,7 @@ class DatasetSplittingCustomProcessor implements CustomProcessor {
// Let's make sure we have at least one training row
isFirstRow = false;
} else if (isRandomlyExcludedFromTraining()) {
row[dependentVariableIndex] = EMPTY;
row[dependentVariableIndex] = DataFrameDataExtractor.NULL_VALUE;
}
}
}

3
x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/dataframe/extractor/DataFrameDataExtractorTests.java
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@ -377,7 +377,8 @@ public class DataFrameDataExtractorTests extends ESTestCase {
assertThat(rows.get().size(), equalTo(3));
assertThat(rows.get().get(0).getValues(), equalTo(new String[] {"11", "21"}));
assertThat(rows.get().get(1).getValues(), equalTo(new String[] {"", "22"}));
assertThat(rows.get().get(1).getValues()[0], equalTo(DataFrameDataExtractor.NULL_VALUE));
assertThat(rows.get().get(1).getValues()[1], equalTo("22"));
assertThat(rows.get().get(2).getValues(), equalTo(new String[] {"13", "23"}));
assertThat(rows.get().get(0).shouldSkip(), is(false));

3
x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/dataframe/process/customprocessing/DatasetSplittingCustomProcessorTests.java
View File

@ -6,6 +6,7 @@
package org.elasticsearch.xpack.ml.dataframe.process.customprocessing;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.xpack.ml.dataframe.extractor.DataFrameDataExtractor;
import org.junit.Before;
import java.util.ArrayList;
@ -98,7 +99,7 @@ public class DatasetSplittingCustomProcessorTests extends ESTestCase {
assertThat(processedRow[fieldIndex], equalTo(row[fieldIndex]));
}
}
if (processedRow[dependentVariableIndex].length() > 0) {
if (DataFrameDataExtractor.NULL_VALUE.equals(processedRow[dependentVariableIndex]) == false) {
assertThat(processedRow[dependentVariableIndex], equalTo(row[dependentVariableIndex]));
trainingRows++;
}