Added shapley values to rest scorer endpoint

aws-lambda-scorer/lambda-template/src/main/java/ai/h2o/mojos/deploy/aws/lambda/MojoScorer.java

@@ -2,11 +2,11 @@
 
 import ai.h2o.mojos.deploy.common.rest.model.ScoreRequest;
 import ai.h2o.mojos.deploy.common.rest.model.ScoreResponse;
-import ai.h2o.mojos.deploy.common.transform.MojoFrameToResponseConverter;
+import ai.h2o.mojos.deploy.common.transform.MojoFrameToScoreResponseConverter;
 import ai.h2o.mojos.deploy.common.transform.RequestChecker;
-import ai.h2o.mojos.deploy.common.transform.RequestToMojoFrameConverter;
 import ai.h2o.mojos.deploy.common.transform.SampleRequestBuilder;
 import ai.h2o.mojos.deploy.common.transform.ScoreRequestFormatException;
+import ai.h2o.mojos.deploy.common.transform.ScoreRequestToMojoFrameConverter;
 import ai.h2o.mojos.runtime.MojoPipeline;
 import ai.h2o.mojos.runtime.frame.MojoFrame;
 import ai.h2o.mojos.runtime.lic.LicenseException;
@@ -35,8 +35,10 @@ public final class MojoScorer {
   private static final Object pipelineLock = new Object();
   private static MojoPipeline pipeline;
 
-  private final RequestToMojoFrameConverter requestConverter = new RequestToMojoFrameConverter();
-  private final MojoFrameToResponseConverter responseConverter = new MojoFrameToResponseConverter();
+  private final ScoreRequestToMojoFrameConverter requestConverter
+          = new ScoreRequestToMojoFrameConverter();
+  private final MojoFrameToScoreResponseConverter responseConverter
+          = new MojoFrameToScoreResponseConverter();
   private final RequestChecker requestChecker = new RequestChecker(new SampleRequestBuilder());
 
   /** Processes a single {@link ScoreRequest} in the given AWS Lambda {@link Context}. */

aws-sagemaker-hosted-scorer/src/main/java/ai/h2o/mojos/deploy/sagemaker/hosted/config/ScorerConfiguration.java

@@ -1,24 +1,36 @@
 package ai.h2o.mojos.deploy.sagemaker.hosted.config;
 
+import ai.h2o.mojos.deploy.common.transform.ContributionRequestToMojoFrameConverter;
 import ai.h2o.mojos.deploy.common.transform.CsvToMojoFrameConverter;
-import ai.h2o.mojos.deploy.common.transform.MojoFrameToResponseConverter;
+import ai.h2o.mojos.deploy.common.transform.MojoFrameToContributionResponseConverter;
+import ai.h2o.mojos.deploy.common.transform.MojoFrameToScoreResponseConverter;
 import ai.h2o.mojos.deploy.common.transform.MojoPipelineToModelInfoConverter;
 import ai.h2o.mojos.deploy.common.transform.MojoScorer;
-import ai.h2o.mojos.deploy.common.transform.RequestToMojoFrameConverter;
 import ai.h2o.mojos.deploy.common.transform.SampleRequestBuilder;
+import ai.h2o.mojos.deploy.common.transform.ScoreRequestToMojoFrameConverter;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 @Configuration
 class ScorerConfiguration {
   @Bean
-  public MojoFrameToResponseConverter responseConverter() {
-    return new MojoFrameToResponseConverter();
+  public MojoFrameToScoreResponseConverter responseConverter() {
+    return new MojoFrameToScoreResponseConverter();
   }
 
   @Bean
-  public RequestToMojoFrameConverter requestConverter() {
-    return new RequestToMojoFrameConverter();
+  public ScoreRequestToMojoFrameConverter requestConverter() {
+    return new ScoreRequestToMojoFrameConverter();
+  }
+
+  @Bean
+  public ContributionRequestToMojoFrameConverter contributionRequestConverter() {
+    return new ContributionRequestToMojoFrameConverter();
+  }
+
+  @Bean
+  public MojoFrameToContributionResponseConverter contributionResponseConverter() {
+    return new MojoFrameToContributionResponseConverter();
   }
 
   @Bean
@@ -38,10 +50,18 @@ public SampleRequestBuilder sampleRequestBuilder() {
 
   @Bean
   public MojoScorer mojoScorer(
-      RequestToMojoFrameConverter requestConverter,
-      MojoFrameToResponseConverter responseConverter,
+      ScoreRequestToMojoFrameConverter requestConverter,
+      MojoFrameToScoreResponseConverter responseConverter,
+      ContributionRequestToMojoFrameConverter contributionRequestConverter,
+      MojoFrameToContributionResponseConverter contributionResponseConverter,
       MojoPipelineToModelInfoConverter modelInfoConverter,
       CsvToMojoFrameConverter csvConverter) {
-    return new MojoScorer(requestConverter, responseConverter, modelInfoConverter, csvConverter);
+    return new MojoScorer(
+            requestConverter,
+            responseConverter,
+            contributionRequestConverter,
+            contributionResponseConverter,
+            modelInfoConverter,
+            csvConverter);
   }
 }

aws-sagemaker-hosted-scorer/src/main/java/ai/h2o/mojos/deploy/sagemaker/hosted/controller/ModelsApiController.java

@@ -1,6 +1,8 @@
 package ai.h2o.mojos.deploy.sagemaker.hosted.controller;
 
 import ai.h2o.mojos.deploy.common.rest.api.ModelApi;
+import ai.h2o.mojos.deploy.common.rest.model.ContributionRequest;
+import ai.h2o.mojos.deploy.common.rest.model.ContributionResponse;
 import ai.h2o.mojos.deploy.common.rest.model.Model;
 import ai.h2o.mojos.deploy.common.rest.model.ScoreRequest;
 import ai.h2o.mojos.deploy.common.rest.model.ScoreResponse;
@@ -11,13 +13,16 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 
 @Controller
 public class ModelsApiController implements ModelApi {
 
+  private static final String UNIMPLEMENTED_MESSAGE
+          = "Shapley values are not implemented yet";
   private static final Logger log = LoggerFactory.getLogger(ModelsApiController.class);
 
   private final MojoScorer scorer;
@@ -84,6 +89,14 @@ public ResponseEntity<ScoreResponse> getScoreByFile(String file) {
     }
   }
 
+  @Override
+  public ResponseEntity<ContributionResponse> getContribution(
+          ContributionRequest request) {
+    // TODO: to be implemented in the future
+    log.info(" Unsupported operation: " + UNIMPLEMENTED_MESSAGE);
+    return ResponseEntity.status(HttpStatus.NOT_IMPLEMENTED).build();
+  }
+
   @Override
   public ResponseEntity<ScoreRequest> getSampleRequest() {
     return ResponseEntity.ok(sampleRequestBuilder.build(scorer.getPipeline().getInputMeta()));

common/swagger/swagger.yaml

@@ -3,7 +3,7 @@ info:
   description: >-
     This is a definition of the REST API for scoring from H2O. This API is
     intended to be used within DAI and eventually across all H2O scoring systems
-  version: 1.0.0
+  version: 1.1.0
   title: Scoring API - v1
   termsOfService: ''
   contact:
@@ -107,6 +107,32 @@ paths:
             $ref: '#/definitions/ScoreResponse'
         '400':
           description: Invalid payload
+  '/model/contribution':
+    post:
+      tags:
+        - contribution
+      summary: Contribution score or Shapley values on given rows
+      description: Computes contribution score with the rows sent in the body of the post request
+      operationId: getContribution
+      consumes:
+        - application/json
+      produces:
+        - application/json
+      parameters:
+        - name: payload
+          in: body
+          required: true
+          schema:
+            $ref: '#/definitions/ContributionRequest'
+      responses:
+        '200':
+          description: Successful operation
+          schema:
+            $ref: '#/definitions/ContributionResponse'
+        '501':
+          description: Implementation not supported
+        '400':
+          description: Invalid payload
 securityDefinitions:
   api_key:
     type: apiKey
@@ -127,10 +153,7 @@ definitions:
         properties:
           scoringType:
             type: string
-            enum:
-              - REGRESSION
-              - CLASSIFICATION
-              - BINOMIAL
+            $ref: '#/definitions/ScoringType'
           scoringResponLabels:
             type: array
             items:
@@ -141,9 +164,69 @@ definitions:
     type: array
     items:
       type: string
+
+  ContributionRequest:
+    type: object
+    required:
+      - requestShapleyValueType
+    properties:
+      requestShapleyValueType:
+        description: >
+          The string to say what type of Shap values are needed.
+          `ORIGINAL` implies Shap values of original features are requested,
+          `TRANSFORMED` implies that Shap values of transformed features are requested.
+        $ref: '#/definitions/ShapleyType'
+      fields:
+        description: >
+          An array holding the names of fields in the order of appearance in the `rows` property. The length of `fields`
+          has to match length of each row in `rows`. No duplicates are allowed.
+        type: array
+        items:
+          type: string
+      rows:
+        description: >
+          An array of rows consisting the actual input data for scoring, one scoring request per row.
+        type: array
+        items:
+          $ref: '#/definitions/Row'
+  ContributionResponse:
+    type: object
+    properties:
+      features:
+        description: >
+          An array holding the names of fields in the order of appearance in the rows of the  `contributions` property.
+        type: array
+        items:
+          type: string
+      contributionGroups:
+        description: >
+          An array of rows consisting of the shapley contributions output corresponding to an output group.
+        type: array
+        items:
+          $ref: '#/definitions/ContributionGroup'
+  ContributionGroup:
+    type: object
+    properties:
+      outputGroup:
+        description: >
+          Name of the output group. It will be populated only for multinomial models.
+          Shapley values are not supported for third party models yet, hence this field will not be populated.
+        type: string
+      contributions:
+        description: >
+          An array of rows consisting of the shapley contributions output corresponding to columns in the fields
+        type: array
+        items:
+          $ref: '#/definitions/Row'
   ScoreRequest:
     type: object
     properties:
+      requestShapleyValueType:
+        description: >
+          The string to say what type of Shap values are needed.
+          `ORIGINAL` implies Shap values of original features are requested,
+          `TRANSFORMED` implies that Shap values of transformed features are requested.
+        $ref: '#/definitions/ShapleyType'
       includeFieldsInOutput:
         description: >
           An array holding the list of field names to be copied from the input request row to the corresponding scoring
@@ -203,6 +286,13 @@ definitions:
         type: array
         items:
           $ref: '#/definitions/Row'
+      featureShapleyContributions:
+        type: object
+        description: >
+          An object with features and shapley values that was requested by the client.
+          It is currently available for transformed features of binomial, regression and multinomial models of mojo2.
+          This field will not be populated if the Shapley values are not available for a model.
+        $ref: '#/definitions/ContributionResponse'
   DataField:
     type: object
     properties:
@@ -235,3 +325,9 @@ definitions:
         type: array
         items:
           $ref: '#/definitions/DataField'
+  ShapleyType:
+    type: string
+    enum: [ ORIGINAL, TRANSFORMED, NONE ]
+  ScoringType:
+    type: string
+    enum: [ REGRESSION, CLASSIFICATION, BINOMIAL ]

common/transform/src/main/java/ai/h2o/mojos/deploy/common/transform/ContributionRequestToMojoFrameConverter.java

@@ -0,0 +1,32 @@
+package ai.h2o.mojos.deploy.common.transform;
+
+import ai.h2o.mojos.deploy.common.rest.model.ContributionRequest;
+import ai.h2o.mojos.deploy.common.rest.model.Row;
+import ai.h2o.mojos.runtime.frame.MojoFrame;
+import ai.h2o.mojos.runtime.frame.MojoFrameBuilder;
+import ai.h2o.mojos.runtime.frame.MojoRowBuilder;
+import java.util.List;
+import java.util.function.BiFunction;
+
+/**
+ * Converts the original API request object
+ * {@link ContributionRequest} into the input {@link MojoFrame}.
+ */
+public class ContributionRequestToMojoFrameConverter
+        implements BiFunction<ContributionRequest, MojoFrameBuilder, MojoFrame> {
+  @Override
+  public MojoFrame apply(ContributionRequest scoreRequest, MojoFrameBuilder frameBuilder) {
+    List<String> fields = scoreRequest.getFields();
+    if (scoreRequest.getRows() != null) {
+      for (Row row : scoreRequest.getRows()) {
+        MojoRowBuilder rowBuilder = frameBuilder.getMojoRowBuilder();
+        for (int i = 0; i < row.size(); i++) {
+          rowBuilder.setValue(fields.get(i), row.get(i));
+        }
+        frameBuilder.addRow(rowBuilder);
+      }
+    }
+
+    return frameBuilder.toMojoFrame();
+  }
+}