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Re: 10-fold cross validation in Random Forests

by Contributor in Support Questions
‎09-07-2016 07:42 AM
‎09-07-2016 07:42 AM
Hello Marco, Dan already answered the question here https://community.hortonworks.com/answers/55111/view.html Thanks, Laia ... View more

Re: error: java.lang.IllegalArgumentException: Fie...

by Contributor in Support Questions
‎09-07-2016 07:40 AM
‎09-07-2016 07:40 AM
Hello Dan, Thank you a lot for the help, it worked! In addition, I would like to have the recall, precision and f1 as well. And I would like to see the random forest trees as well. Do you know how I can do it? I have 2 imbalanced classes, so I would like to have them for each class... Best regards, Laia ... View more

error: java.lang.IllegalArgumentException: Field "...

by Contributor in Support Questions
‎09-06-2016 07:45 AM
1 Kudo
‎09-06-2016 07:45 AM
1 Kudo
Hello, I have the following error: java.lang.IllegalArgumentException: Field "label_idx" does not exist. After executing this code: import org.apache.spark.mllib.tree.RandomForest import org.apache.spark.mllib.tree.model.RandomForestModel import org.apache.spark.mllib.util.MLUtils import org.apache.spark.mllib.linalg.Vectors import org.apache.spark.mllib.regression.LabeledPoint import org.apache.spark.mllib.evaluation.MulticlassMetrics import org.apache.spark.ml.Pipeline import org.apache.spark.ml.tuning.{ParamGridBuilder, CrossValidator} import org.apache.spark.ml.classification.RandomForestClassifier import org.apache.spark.ml.evaluation.MulticlassClassificationEvaluator import org.apache.spark.sql.types._ import sqlContext.implicits._ import org.apache.spark.ml.attribute.NominalAttribute import org.apache.spark.ml.feature.StringIndexer val unparseddata = sc.textFile("hdfs:///tmp/epidemiological16.csv") val data = unparseddata.map { line => val parts = line.split(',').map(_.toDouble) LabeledPoint(parts.last%2, Vectors.dense(parts.slice(0, parts.length - 1))) } val splits = data.randomSplit(Array(0.7, 0.3)) val (trainingData2, testData2) = (splits(0), splits(1)) val trainingData = trainingData2.toDF val nFolds: Int = 10 val NumTrees: Int = 3 val rf = new RandomForestClassifier() .setNumTrees(NumTrees) .setFeaturesCol("features") val indexer = new StringIndexer() .setInputCol("label") .setOutputCol("label_idx") .fit(trainingData) rf.setLabelCol("label_idx").fit(indexer.transform(trainingData)) val pipeline = new Pipeline().setStages(Array(rf)) val paramGrid = new ParamGridBuilder().build() val evaluator = new MulticlassClassificationEvaluator() .setLabelCol("label") .setPredictionCol("prediction") val cv = new CrossValidator() .setEstimator(pipeline) .setEvaluator(evaluator) .setEstimatorParamMaps(paramGrid) .setNumFolds(nFolds) val model = cv.fit(trainingData) Do you know where can be the problem? Thanks, Laia ... View more
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Re: 10-fold cross validation in Random Forests

by Contributor in Support Questions
‎09-05-2016 12:46 PM
‎09-05-2016 12:46 PM
Hello, I have the following error: java.lang.IllegalArgumentException: Field "label_idx" does not exist. After executing this code: import org.apache.spark.mllib.tree.RandomForest import org.apache.spark.mllib.tree.model.RandomForestModel import org.apache.spark.mllib.util.MLUtils import org.apache.spark.mllib.linalg.Vectors import org.apache.spark.mllib.regression.LabeledPoint import org.apache.spark.mllib.evaluation.MulticlassMetrics import org.apache.spark.ml.Pipeline import org.apache.spark.ml.tuning.{ParamGridBuilder, CrossValidator} import org.apache.spark.ml.classification.RandomForestClassifier import org.apache.spark.ml.evaluation.MulticlassClassificationEvaluator import org.apache.spark.sql.types._ import sqlContext.implicits._ import org.apache.spark.ml.attribute.NominalAttribute import org.apache.spark.ml.feature.StringIndexer val unparseddata = sc.textFile("hdfs:///tmp/epidemiological16.csv") val data = unparseddata.map { line => val parts = line.split(',').map(_.toDouble) LabeledPoint(parts.last%2, Vectors.dense(parts.slice(0, parts.length - 1))) } val splits = data.randomSplit(Array(0.7, 0.3)) val (trainingData2, testData2) = (splits(0), splits(1)) val trainingData = trainingData2.toDF val nFolds: Int = 10 val NumTrees: Int = 3 val rf = new RandomForestClassifier() .setNumTrees(NumTrees) .setFeaturesCol("features") val indexer = new StringIndexer() .setInputCol("label") .setOutputCol("label_idx") .fit(trainingData) rf.setLabelCol("label_idx").fit(indexer.transform(trainingData)) val pipeline = new Pipeline().setStages(Array(rf)) val paramGrid = new ParamGridBuilder().build() val evaluator = new MulticlassClassificationEvaluator() .setLabelCol("label") .setPredictionCol("prediction") val cv = new CrossValidator() .setEstimator(pipeline) .setEvaluator(evaluator) .setEstimatorParamMaps(paramGrid) .setNumFolds(nFolds) val model = cv.fit(trainingData) Do you know where can be the problem? Thanks, Laia ... View more

10-fold cross validation in Random Forests

by Contributor in Support Questions
‎09-05-2016 09:32 AM
‎09-05-2016 09:32 AM
Hello, I am using this Scala code of MLlib about random forests. I wonder if this code uses 10-fold cross validation. If not, I would like to know how to do it in Scala. Thanks, Laia ... View more
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Re: Description of the PCA

by Contributor in Support Questions
‎08-18-2016 09:56 AM
‎08-18-2016 09:56 AM
Thank you. ... View more

Description of the PCA

by Contributor in Support Questions
‎08-17-2016 07:06 AM
‎08-17-2016 07:06 AM
Hi, I executed the following code to obtain a description of the PCA import org.apache.spark.mllib.feature.PCA import org.apache.spark.mllib.linalg.Vectors import org.apache.spark.mllib.regression.LabeledPoint import org.apache.spark.rdd.RDDval unparseddata = sc.textFile("hdfs:///tmp/epidemiological10.csv") val data = unparseddata.map { line => val parts = line.split(',').map(_.toDouble) LabeledPoint(parts.last, Vectors.dense(parts.slice(0, parts.length))) } val pca = new PCA(5).fit(data.map(_.features)) val projected = data.map(p => p.copy(features = pca.transform(p.features))) val collect = projected.collect() println("Projected vector of principal component:") collect.foreach { vector => println(vector)} and I obtained the following result: (160.0,[-226.2602388674248,-28.5763504459316,-167.30588000588938,-169.403316284169,23.09294762015914]) (176.0,[-248.89483793051159,-21.97201619037966,-193.69749510702238,-108.81814406079761,20.90854574732602]) (179.0,[-253.1354367540671,-29.972928370070743,-244.2610705303066,-129.17921788251297,20.090356540571392]) (172.7,[-244.22812858428057,-21.1460977635957,-179.6413565398707,-106.6403738598213,23.450082340280513]) ... I assume that in brackets there are the five first components of the PCA but I could like to know what do the numbers I put in bold mean. Thanks in advance, Laia ... View more
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Last Visited ‎10-20-2016 07:57 AM
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