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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 com.intel.analytics.bigdl.nn.tf
import com.google.protobuf.ByteString
import com.intel.analytics.bigdl.nn.abstractnn.{AbstractModule, Activity}
import com.intel.analytics.bigdl.nn.ops.Operation
import com.intel.analytics.bigdl.serialization.Bigdl.{AttrValue, BigDLModule}
import com.intel.analytics.bigdl.tensor._
import com.intel.analytics.bigdl.tensor.TensorNumericMath.{NumericWildcard, TensorNumeric}
import com.intel.analytics.bigdl.utils.Table
import com.intel.analytics.bigdl.utils.serializer.{DeserializeContext, ModuleSerializable, SerializeContext}
import com.intel.analytics.bigdl.utils.serializer.converters.DataConverter
import com.intel.analytics.bigdl.utils.tf.TFTensorNumeric._
import org.tensorflow.example.{Example, Feature}
import scala.collection.JavaConverters._
import scala.reflect.ClassTag
import scala.reflect.runtime.universe
private[bigdl] class ParseExample[T: ClassTag](val nDense: Int,
val tDense: Seq[TensorDataType],
val denseShape: Seq[Array[Int]])
(implicit ev: TensorNumeric[T])
extends Operation[Table, Table, T] {
type StringType = ByteString
override def updateOutput(input: Table): Table = {
require(input[Tensor[StringType]](1).size(1) == 1, "only support one example at a time")
val serialized = input[Tensor[StringType]](1).valueAt(1)
val denseKeys = Range(3, 3 + nDense).map(index => input(index).asInstanceOf[Tensor[StringType]])
.map(_.value().toStringUtf8)
val denseDefault = Range(3 + nDense, 3 + 2 * nDense)
.map(index => input(index).asInstanceOf[Tensor[_]])
val example = Example.parseFrom(serialized)
val featureMap = example.getFeatures.getFeatureMap
val outputs = denseDefault
.zip(denseKeys)
.zip(tDense).zip(denseShape).map { case (((default, key), tensorType), shape) =>
if (featureMap.containsKey(key)) {
val feature = featureMap.get(key)
getTensorFromFeature(feature, tensorType, shape)
} else {
default
}
}
for (elem <- outputs) {
elem.asInstanceOf[Tensor[NumericWildcard]].addSingletonDimension()
output.insert(elem)
}
output
}
private def getTensorFromFeature(feature: Feature,
tensorType: TensorDataType,
tensorShape: Array[Int]): Tensor[_] = {
tensorType match {
case LongType =>
val values = feature.getInt64List.getValueList.asScala.map(_.longValue()).toArray
Tensor(values, tensorShape)
case FloatType =>
val values = feature.getFloatList.getValueList.asScala.map(_.floatValue()).toArray
Tensor(values, tensorShape)
case StringType =>
val values = feature.getBytesList.getValueList.asScala.toArray
Tensor(values, tensorShape)
case t => throw new NotImplementedError(s"$t is not supported")
}
}
}
private[bigdl] object ParseExample extends ModuleSerializable {
def apply[T: ClassTag](nDense: Int,
tDense: Seq[TensorDataType],
denseShape: Seq[Array[Int]])
(implicit ev: TensorNumeric[T]): ParseExample[T] =
new ParseExample[T](nDense, tDense, denseShape)
override def doLoadModule[T: ClassTag](context: DeserializeContext)
(implicit ev: TensorNumeric[T]): AbstractModule[Activity, Activity, T] = {
val attrMap = context.bigdlModule.getAttrMap
val nDense = DataConverter.getAttributeValue(context, attrMap.get("nDense")).
asInstanceOf[Int]
val tDense = DataConverter.getAttributeValue(context, attrMap.get("tDense")).
asInstanceOf[Array[String]].map(toTensorType(_))
val shapeSize = DataConverter.getAttributeValue(context, attrMap.get("shapeSize")).
asInstanceOf[Int]
val denseShape = new Array[Array[Int]](shapeSize)
for (i <- 1 to shapeSize) {
denseShape(i - 1) = DataConverter.getAttributeValue(context,
attrMap.get(s"shapeSize_${i - 1}")).
asInstanceOf[Array[Int]]
}
ParseExample[T](nDense, tDense.toSeq, denseShape.toSeq)
}
override def doSerializeModule[T: ClassTag](context: SerializeContext[T],
bigDLModelBuilder: BigDLModule.Builder)(implicit ev: TensorNumeric[T]): Unit = {
val parseExample = context.moduleData.module.asInstanceOf[ParseExample[T]]
val nDenseBuilder = AttrValue.newBuilder
DataConverter.setAttributeValue(context, nDenseBuilder, parseExample.nDense,
universe.typeOf[Int])
bigDLModelBuilder.putAttr("nDense", nDenseBuilder.build)
val tensorTypeBuilder = AttrValue.newBuilder
DataConverter.setAttributeValue(context, tensorTypeBuilder,
parseExample.tDense.toArray.map(fromTensorType(_)),
universe.typeOf[Array[String]])
bigDLModelBuilder.putAttr("tDense", tensorTypeBuilder.build)
val shapeSizeBuilder = AttrValue.newBuilder
DataConverter.setAttributeValue(context, shapeSizeBuilder,
parseExample.denseShape.size,
universe.typeOf[Int])
bigDLModelBuilder.putAttr("shapeSize", shapeSizeBuilder.build)
parseExample.denseShape.zipWithIndex.foreach(shape => {
val shapeBuilder = AttrValue.newBuilder
DataConverter.setAttributeValue(context, shapeBuilder,
parseExample.denseShape(shape._2),
universe.typeOf[Array[Int]])
bigDLModelBuilder.putAttr(s"shapeSize_${shape._2}", shapeBuilder.build)
})
}
private def fromTensorType(ttype : TensorDataType): String = {
ttype match {
case LongType => "Long"
case FloatType => "Float"
case StringType => "String"
case t => throw new NotImplementedError(s"$t is not supported")
}
}
private def toTensorType(ttype : String): TensorDataType = {
ttype match {
case "Long" => LongType
case "Float" => FloatType
case "String" => StringType
}
}
}
