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/*
* Copyright 2016 The BigDL Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.ml
import com.intel.analytics.bigdl.{Criterion, Module}
import com.intel.analytics.bigdl.dataset._
import com.intel.analytics.bigdl.models.utils.ModelBroadcast
import com.intel.analytics.bigdl.optim._
import com.intel.analytics.bigdl.tensor.TensorNumericMath.TensorNumeric
import com.intel.analytics.bigdl.tensor.{Storage, Tensor}
import com.intel.analytics.bigdl.utils.T
import com.intel.analytics.bigdl.visualization.{TrainSummary, ValidationSummary}
import org.apache.spark.ml.param.shared.{HasFeaturesCol, HasPredictionCol}
import org.apache.spark.ml.param.{IntParam, ParamMap, ParamValidators, _}
import org.apache.spark.ml.util.SchemaUtils
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.types._
import org.apache.spark.sql.{DataFrame, Row}
import scala.reflect.ClassTag
private[ml] trait HasBatchSize extends Params {
final val batchSize: Param[Int] = new Param[Int](this, "batchSize", "batchSize")
def getBatchSize: Int = $(batchSize)
}
/**
* Common trait for DLEstimator and DLModel
*/
private[ml] trait DLParams[@specialized(Float, Double) T] extends HasFeaturesCol
with HasPredictionCol with VectorCompatibility with HasBatchSize {
/**
* When to stop the training, passed in a [[Trigger]]. E.g. Trigger.maxIterations
*/
final val endWhen = new Param[Trigger](this, "endWhen", "Trigger to stop the training")
def getEndWhen: Trigger = $(endWhen)
/**
* learning rate for the optimizer in the DLEstimator.
* Default: 0.001
*/
final val learningRate = new DoubleParam(
this, "learningRate", "learningRate", ParamValidators.gt(0))
def getLearningRate: Double = $(learningRate)
/**
* learning rate decay for each iteration.
* Default: 0
*/
final val learningRateDecay = new DoubleParam(this, "learningRateDecay", "learningRateDecay")
def getLearningRateDecay: Double = $(learningRateDecay)
/**
* Number of max Epoch for the training, an epoch refers to a traverse over the training data
* Default: 50
*/
final val maxEpoch = new IntParam(this, "maxEpoch", "number of max Epoch", ParamValidators.gt(0))
def getMaxEpoch: Int = $(maxEpoch)
/**
* optimization method to be used. BigDL supports many optimization methods like Adam,
* SGD and LBFGS. Refer to package com.intel.analytics.bigdl.optim for all the options.
* Default: SGD
*/
final val optimMethod = new Param[OptimMethod[T]](this, "optimMethod", "optimMethod")
def getOptimMethod: OptimMethod[T] = $(optimMethod)
setDefault(batchSize -> 1)
/**
* Validate if feature and label columns are of supported data types.
* Default: 0
*/
protected def validateDataType(schema: StructType, colName: String): Unit = {
val dataTypes = Seq(
new ArrayType(DoubleType, false),
new ArrayType(DoubleType, true),
new ArrayType(FloatType, false),
new ArrayType(FloatType, true),
DoubleType,
FloatType
) ++ validVectorTypes
// TODO use SchemaUtils.checkColumnTypes after convert to 2.0
val actualDataType = schema(colName).dataType
require(dataTypes.exists(actualDataType.equals),
s"Column $colName must be of type equal to one of the following types: " +
s"${dataTypes.mkString("[", ", ", "]")} but was actually of type $actualDataType.")
}
/**
* Get conversion function to extract data from original DataFrame
* Default: 0
*/
protected def getConvertFunc(colType: DataType): (Row, Int) => Seq[AnyVal] = {
colType match {
case ArrayType(DoubleType, false) =>
(row: Row, index: Int) => row.getSeq[Double](index)
case ArrayType(DoubleType, true) =>
(row: Row, index: Int) => row.getSeq[Double](index)
case ArrayType(FloatType, false) =>
(row: Row, index: Int) => row.getSeq[Float](index)
case ArrayType(FloatType, true) =>
(row: Row, index: Int) => row.getSeq[Float](index)
case DoubleType =>
(row: Row, index: Int) => Seq[Double](row.getDouble(index))
case FloatType =>
(row: Row, index: Int) => Seq[Float](row.getFloat(index))
case _ =>
if (colType.typeName.contains("vector")) {
(row: Row, index: Int) => getVectorSeq(row, colType, index)
} else {
throw new IllegalArgumentException(
s"$colType is not a supported (Unexpected path).")
}
}
}
}
/**
* [[DLEstimator]] helps to train a BigDL Model with the Spark ML Estimator/Transfomer pattern,
* thus Spark users can conveniently fit BigDL into Spark ML pipeline.
*
* [[DLEstimator]] supports feature and label data in the format of
* Array[Double], Array[Float], org.apache.spark.mllib.linalg.{Vector, VectorUDT},
* org.apache.spark.ml.linalg.{Vector, VectorUDT}, Double and Float.
*
* User should specify the feature data dimensions and label data dimensions via the constructor
* parameters featureSize and labelSize respectively. Internally the feature and label data are
* converted to BigDL tensors, to further train a BigDL model efficiently.
*
* For details usage, please refer to examples in package
* com.intel.analytics.bigdl.example.MLPipeline
*
* @param model BigDL module to be optimized
* @param criterion BigDL criterion method
* @param featureSize The size (Tensor dimensions) of the feature data. e.g. an image may be with
* width * height = 28 * 28, featureSize = Array(28, 28).
* @param labelSize The size (Tensor dimensions) of the label data.
*/
@deprecated("`DLEstimator` has been migrated to package `com.intel.analytics.bigdl.dlframes`." +
"This will be removed in BigDL 0.6.", "0.5.0")
class DLEstimator[@specialized(Float, Double) T: ClassTag](
@transient val model: Module[T],
val criterion : Criterion[T],
val featureSize : Array[Int],
val labelSize : Array[Int],
override val uid: String = "DLEstimator")(implicit ev: TensorNumeric[T])
extends DLEstimatorBase[DLEstimator[T], DLModel[T]] with DLParams[T] {
def setFeaturesCol(featuresColName: String): this.type = set(featuresCol, featuresColName)
def setLabelCol(labelColName : String) : this.type = set(labelCol, labelColName)
def setPredictionCol(value: String): this.type = set(predictionCol, value)
def setBatchSize(value: Int): this.type = set(batchSize, value)
def setEndWhen(trigger: Trigger): this.type = set(endWhen, trigger)
def setLearningRate(value: Double): this.type = set(learningRate, value)
setDefault(learningRate -> 1e-3)
def setLearningRateDecay(value: Double): this.type = set(learningRateDecay, value)
setDefault(learningRateDecay -> 0.0)
def setMaxEpoch(value: Int): this.type = set(maxEpoch, value)
setDefault(maxEpoch -> 50)
def setOptimMethod(value: OptimMethod[T]): this.type = set(optimMethod, value)
set(optimMethod, new SGD[T])
@transient private var trainSummary: Option[TrainSummary] = None
def getTrainSummary: Option[TrainSummary] = trainSummary
/**
* Statistics (LearningRate, Loss, Throughput, Parameters) collected during training for the
* training data, which can be used for visualization via Tensorboard.
* Use setTrainSummary to enable train logger. Then the log will be saved to
* logDir/appName/train as specified by the parameters of TrainSummary.
*
* Default: Not enabled
*/
def setTrainSummary(value: TrainSummary): this.type = {
this.trainSummary = Some(value)
this
}
@transient private var validationSummary: Option[ValidationSummary] = None
/**
* Statistics (LearningRate, Loss, Throughput, Parameters) collected during training for the
* validation data if validation data is set, which can be used for visualization via
* Tensorboard. Use setValidationSummary to enable validation logger. Then the log will be
* saved to logDir/appName/ as specified by the parameters of validationSummary.
*
* Default: None
*/
def getValidationSummary: Option[ValidationSummary] = validationSummary
/**
* Enable validation Summary
*/
def setValidationSummary(value: ValidationSummary): this.type = {
this.validationSummary = Some(value)
this
}
@transient private var validationTrigger: Option[Trigger] = None
@transient private var validationDF: DataFrame = _
@transient private var validationMethods: Array[ValidationMethod[T]] = _
@transient private var validationBatchSize: Int = 0
/**
* Set a validate evaluation during training
*
* @param trigger how often to evaluation validation set
* @param validationDF validate data set
* @param vMethods a set of validation method [[ValidationMethod]]
* @param batchSize batch size for validation
* @return this optimizer
*/
def setValidation(trigger: Trigger, validationDF: DataFrame,
vMethods : Array[ValidationMethod[T]], batchSize: Int)
: this.type = {
this.validationTrigger = Some(trigger)
this.validationDF = validationDF
this.validationMethods = vMethods
this.validationBatchSize = batchSize
this
}
protected def validateParams(schema : StructType): Unit = {
validateDataType(schema, $(featuresCol))
validateDataType(schema, $(labelCol))
if(isSet(endWhen) && isSet(maxEpoch)) {
throw new IllegalArgumentException(s"endWhen and maxEpoch cannot be both set")
}
if (validationTrigger.isEmpty && validationSummary.isDefined) {
throw new IllegalArgumentException(
s"validationSummary is only valid if validation data is set.")
}
}
override def transformSchema(schema : StructType): StructType = {
validateParams(schema)
SchemaUtils.appendColumn(schema, $(predictionCol), ArrayType(DoubleType, false))
}
protected override def internalFit(dataFrame: DataFrame): DLModel[T] = {
val localFeatureCol = $(featuresCol)
val localLabelCol = $(labelCol)
def getSamples(dataFrame: DataFrame): RDD[Sample[T]] = {
val featureType = dataFrame.schema(localFeatureCol).dataType
val featureColIndex = dataFrame.schema.fieldIndex(localFeatureCol)
val labelType = dataFrame.schema(localLabelCol).dataType
val labelColIndex = dataFrame.schema.fieldIndex(localLabelCol)
val featureFunc = getConvertFunc(featureType)
val labelFunc = getConvertFunc(labelType)
val featureAndLabel: RDD[(Seq[AnyVal], Seq[AnyVal])] = dataFrame.rdd.map { row =>
val features = featureFunc(row, featureColIndex)
val labels = labelFunc(row, labelColIndex)
(features, labels)
}
val samples = featureAndLabel.map { case (f, l) =>
// convert feature and label data type to the same type with model
// TODO: investigate to reduce memory consumption during conversion.
val feature = f.head match {
case dd: Double => f.asInstanceOf[Seq[Double]].map(ev.fromType(_))
case ff: Float => f.asInstanceOf[Seq[Float]].map(ev.fromType(_))
}
val label = l.head match {
case dd: Double => l.asInstanceOf[Seq[Double]].map(ev.fromType(_))
case ff: Float => l.asInstanceOf[Seq[Float]].map(ev.fromType(_))
}
(feature, label)
}.map { case (feature, label) =>
Sample(Tensor(feature.toArray, featureSize), Tensor(label.toArray, labelSize))
}
samples
}
val trainingSamples = getSamples(dataFrame)
val state = T("learningRate" -> $(learningRate), "learningRateDecay" -> $(learningRateDecay))
val endTrigger = if (isSet(endWhen)) $(endWhen) else Trigger.maxEpoch($(maxEpoch))
val optimizer = Optimizer(model, trainingSamples, criterion, $(batchSize))
.setState(state)
.setOptimMethod($(optimMethod))
.setEndWhen(endTrigger)
if (validationTrigger.isDefined) {
val validationSamples = getSamples(validationDF)
optimizer.setValidation(
validationTrigger.get,
validationSamples,
validationMethods,
validationBatchSize)
if (this.validationSummary.isDefined) {
optimizer.setValidationSummary(this.validationSummary.get)
}
}
if (this.trainSummary.isDefined) {
optimizer.setTrainSummary(this.trainSummary.get)
}
val optimizedModel = optimizer.optimize()
wrapBigDLModel(optimizedModel, featureSize)
}
/**
* sub classes can extend the method and return required model for different transform tasks
*/
protected def wrapBigDLModel(m: Module[T], featureSize: Array[Int]): DLModel[T] = {
val dlModel = new DLModel[T](m, featureSize)
copyValues(dlModel.setParent(this))
}
override def copy(extra: ParamMap): DLEstimator[T] = {
copyValues(new DLEstimator(model, criterion, featureSize, labelSize), extra)
}
}
/**
* [[DLModel]] helps embed a BigDL model into a Spark Transformer, thus Spark users can
* conveniently merge BigDL into Spark ML pipeline.
* [[DLModel]] supports feature data in the format of
* Array[Double], Array[Float], org.apache.spark.mllib.linalg.{Vector, VectorUDT},
* org.apache.spark.ml.linalg.{Vector, VectorUDT}, Double and Float.
* Internally [[DLModel]] use features column as storage of the feature data, and create
* Tensors according to the constructor parameter featureSize.
*
* [[DLModel]] is compatible with both spark 1.5-plus and 2.0 by extending ML Transformer.
* @param model trainned BigDL models to use in prediction.
* @param featureSize The size (Tensor dimensions) of the feature data. (e.g. an image may be with
* featureSize = 28 * 28).
*/
@deprecated("`DLModel` has been migrated to package `com.intel.analytics.bigdl.dlframes`." +
"This will be removed in BigDL 0.6.", "0.5.0")
class DLModel[@specialized(Float, Double) T: ClassTag](
@transient val model: Module[T],
var featureSize : Array[Int],
override val uid: String = "DLModel"
)(implicit ev: TensorNumeric[T])
extends DLTransformerBase[DLModel[T]] with DLParams[T] with HasBatchSize {
def setFeaturesCol(featuresColName: String): this.type = set(featuresCol, featuresColName)
def setPredictionCol(value: String): this.type = set(predictionCol, value)
def setFeatureSize(value: Array[Int]): this.type = {
this.featureSize = value
this
}
def setBatchSize(value: Int): this.type = set(batchSize, value)
def getFeatureSize: Array[Int] = this.featureSize
/**
* Perform a prediction on featureCol, and write result to the predictionCol.
*/
protected override def internalTransform(dataFrame: DataFrame): DataFrame = {
val featureType = dataFrame.schema($(featuresCol)).dataType
val featureColIndex = dataFrame.schema.fieldIndex($(featuresCol))
val featureFunc = getConvertFunc(featureType)
val sc = dataFrame.sqlContext.sparkContext
val modelBroadCast = ModelBroadcast[T]().broadcast(sc, model)
val localBatchSize = $(batchSize)
val resultRDD = dataFrame.rdd.mapPartitions { rowIter =>
val localModel = modelBroadCast.value()
rowIter.grouped(localBatchSize).flatMap { rowBatch =>
val samples = rowBatch.map { row =>
val features = featureFunc(row, featureColIndex)
val featureBuffer = features.head match {
case dd: Double => features.asInstanceOf[Seq[Double]].map(ev.fromType(_))
case ff: Float => features.asInstanceOf[Seq[Float]].map(ev.fromType(_))
}
Sample(Tensor(featureBuffer.toArray, featureSize))
}.toIterator
val predictions = SampleToMiniBatch(localBatchSize).apply(samples).flatMap { batch =>
val batchResult = localModel.forward(batch.getInput())
batchResult.toTensor.split(1).map(outputToPrediction)
}
rowBatch.toIterator.zip(predictions).map { case (row, predict) =>
Row.fromSeq(row.toSeq ++ Seq(predict))
}
}
}
val resultSchema = transformSchema(dataFrame.schema)
dataFrame.sqlContext.createDataFrame(resultRDD, resultSchema)
}
protected def outputToPrediction(output: Tensor[T]): Any = {
output.clone().storage().array().map(ev.toType[Double])
}
override def transformSchema(schema : StructType): StructType = {
validateDataType(schema, $(featuresCol))
SchemaUtils.appendColumn(schema, $(predictionCol), ArrayType(DoubleType, false))
}
override def copy(extra: ParamMap): DLModel[T] = {
val copied = new DLModel(model, featureSize, uid).setParent(parent)
copyValues(copied, extra)
}
}
// TODO, add save/load
object DLModel {
}
