use seed from AutoMLExperiment.setting in eci_cfo tuner (#6406)

Author: LittleLittleCloud

src/Microsoft.ML.AutoML/Tuner/EciCfoTuner.cs

@@ -32,7 +32,7 @@ public EciCostFrugalTuner(SweepablePipeline sweepablePipeline, AutoMLExperiment.
             _tuners = pipelineSchemas.ToDictionary(schema => schema, schema =>
             {
                 var searchSpace = sweepablePipeline.BuildSweepableEstimatorPipeline(schema).SearchSpace;
-                return new CostFrugalTuner(searchSpace, searchSpace.SampleFromFeatureSpace(searchSpace.Default)) as ITuner;
+                return new CostFrugalTuner(searchSpace, searchSpace.SampleFromFeatureSpace(searchSpace.Default), seed: settings.Seed) as ITuner;
             });
 
             if (trialResultManager != null)

test/Microsoft.ML.AutoML.Tests/AutoMLExperimentTests.cs

@@ -228,7 +228,7 @@ public async Task AutoMLExperiment_Iris_CV_5_Test()
             var context = new MLContext(1);
             context.Log += (o, e) =>
             {
-                if (e.Source.StartsWith("AutoMLExperiment"))
+                if (e.RawMessage.Contains("Trial"))
                 {
                     this.Output.WriteLine(e.RawMessage);
                 }
@@ -328,6 +328,20 @@ public async Task AutoMLExperiment_Taxi_Fare_CV_5_Test()
             var result = await experiment.RunAsync();
             result.Metric.Should().BeGreaterThan(0.5);
         }
+
+        [Fact]
+        public void AutoMLExperiment_should_use_seed_from_context_if_provided()
+        {
+            var context = new MLContext();
+            var experiment = context.Auto().CreateExperiment();
+            var settings = experiment.ServiceCollection.BuildServiceProvider().GetRequiredService<AutoMLExperiment.AutoMLExperimentSettings>();
+            settings.Seed.Should().BeNull();
+
+            context = new MLContext(1);
+            experiment = context.Auto().CreateExperiment();
+            settings = experiment.ServiceCollection.BuildServiceProvider().GetRequiredService<AutoMLExperiment.AutoMLExperimentSettings>();
+            settings.Seed.Should().Be(1);
+        }
     }
 
     class DummyTrialRunner : ITrialRunner