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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.optim
import com.intel.analytics.bigdl._
import com.intel.analytics.bigdl.dataset.{SampleToMiniBatch, _}
import com.intel.analytics.bigdl.nn.abstractnn.Activity
import com.intel.analytics.bigdl.tensor.TensorNumericMath.TensorNumeric
import com.intel.analytics.bigdl.utils.{Engine, MklBlas, Util}
import com.intel.analytics.bigdl.utils.Util._
import com.intel.analytics.bigdl.transform.vision.image.{ImageFeature, ImageFrame, LocalImageFrame}
import org.apache.log4j.Logger
import scala.reflect.ClassTag
object LocalPredictor {
val logger = Logger.getLogger(getClass)
def apply[T: ClassTag](model: Module[T],
featurePaddingParam: Option[PaddingParam[T]] = None,
batchPerCore: Int = 4)
(implicit ev: TensorNumeric[T]): LocalPredictor[T] = {
new LocalPredictor[T](model, featurePaddingParam, batchPerCore)
}
}
/**
* Predictor for local data
* @param model BigDL model
* @param featurePaddingParam featurePaddingParam if the inputs have variant size
* @param batchPerCore batch size per core, default is 4
*/
class LocalPredictor[T: ClassTag] private[optim](model: Module[T],
featurePaddingParam: Option[PaddingParam[T]] = None,
batchPerCore: Int = 4)
(implicit ev: TensorNumeric[T]) extends Serializable {
val logger = LocalPredictor.logger
private val coreNumber = Engine.coreNumber()
private val subModelNumber = Engine.getEngineType match {
case MklBlas => coreNumber
case _ => throw new IllegalArgumentException
}
private val workingModels = {
val weightsBias = Util.getAndClearWeightBias(model.parameters())
val models = (1 to subModelNumber).map(_ => {
val submodel = model.cloneModule().evaluate()
putWeightBias(weightsBias, submodel)
submodel
}).toArray
Util.putWeightBias(weightsBias, model)
Util.initGradWeightBias(weightsBias, model)
models
}
val workingToBatch = {
val toBatch = SampleToMiniBatch[T](
batchSize = batchPerCore * subModelNumber,
partitionNum = Some(subModelNumber),
featurePaddingParam = featurePaddingParam)
(1 to subModelNumber).map(_ => {
toBatch.cloneTransformer()
}).toArray
}
def predictClass(dataSet: Array[Sample[T]]): Array[Int] = {
val result = predict(dataSet)
result.map(output => {
val _output = output.toTensor[T]
require(_output.dim() == 1, s"Predictor.predictClass:" +
s"Only support one sample has one label, but got ${_output.dim()} label")
ev.toType[Int](_output.max(1)._2.valueAt(1))
})
}
def predictClass(dataSet: LocalDataSet[MiniBatch[T]]): Array[Int] = {
val result = predict(dataSet)
result.map(output => {
val _output = output.toTensor[T]
require(_output.dim() == 1, s"Predictor.predictClass:" +
s"Only support one sample has one lable, but got ${_output.dim()} label")
ev.toType[Int](_output.max(1)._2.valueAt(1))
})
}
def predict(dataSet: LocalDataSet[MiniBatch[T]]): Array[Activity] = {
val dataIter = dataSet.data(train = false)
dataIter.map(batch => {
println("Enter map")
val stackSize = batch.size() / subModelNumber
val extraSize = batch.size() % subModelNumber
val parallelism = if (stackSize == 0) extraSize else subModelNumber
val start = System.nanoTime()
val result = Engine.default.invokeAndWait(
(0 until parallelism).map(b =>
() => {
val offset = b * stackSize + math.min(b, extraSize) + 1
val length = stackSize + (if (b < extraSize) 1 else 0)
val currentMiniBatch = batch.slice(offset, length)
val input = currentMiniBatch.getInput()
val output = workingModels(b).forward(input).toTensor[T]
output
}
)
)
val batchResult = result.flatMap(_.split(1)).map(_.asInstanceOf[Activity])
batchResult
}).toArray.flatten
}
def predict(dataSet: Array[Sample[T]]): Array[Activity] = {
val dataIter = dataSet.grouped(batchPerCore * subModelNumber)
dataIter.map(batch => {
val groupedSamples = batch.grouped(batchPerCore).toArray
Engine.default.invokeAndWait(
groupedSamples.indices.map(b =>
() => {
val samples = groupedSamples(b)
val model = workingModels(b)
val toBatch = workingToBatch(b)
Predictor.predictSamples(model, samples, toBatch, false)
}
)
).flatten
}).flatten.toArray
}
/**
* local model predict images, return imageFrame with predicted tensor
* @param imageFrame imageFrame that contains images
* @param outputLayer if outputLayer is not null, the output of layer that matches
* outputLayer will be used as predicted output
* @param shareBuffer whether to share same memory for each batch predict results
* @param predictKey key to store predicted result
*/
def predictImage(imageFrame: LocalImageFrame,
outputLayer: String = null,
shareBuffer: Boolean = false,
predictKey: String = ImageFeature.predict): LocalImageFrame = {
val dataIter = imageFrame.array.grouped(batchPerCore * subModelNumber)
val result = dataIter.map(batch => {
val groupedImages = batch.grouped(batchPerCore).toArray
Engine.default.invokeAndWait(
groupedImages.indices.map(b =>
() => {
val imageFeatures = groupedImages(b)
val model = workingModels(b)
val toBatch = workingToBatch(b)
Predictor.predictImageBatch[T](model, imageFeatures, outputLayer, predictKey,
toBatch, shareBuffer)
}
)
).flatten
}).flatten
ImageFrame.array(result.toArray)
}
}
