com.intel.analytics.bigdl.nn.keras.GlobalMaxPooling2D.scala Maven / Gradle / Ivy
/*
* 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.keras
import com.intel.analytics.bigdl.nn.abstractnn.{AbstractModule, DataFormat}
import com.intel.analytics.bigdl.nn.{SpatialMaxPooling, Squeeze, Sequential => TSequential}
import com.intel.analytics.bigdl.tensor.Tensor
import com.intel.analytics.bigdl.tensor.TensorNumericMath.TensorNumeric
import com.intel.analytics.bigdl.utils.Shape
import scala.reflect.ClassTag
/**
* Applies global max pooling operation for spatial data.
* The input of this layer should be 4D.
*
* When you use this layer as the first layer of a model, you need to provide the argument
* inputShape (a Single Shape, does not include the batch dimension).
*
* @param dimOrdering Format of input data. Please use DataFormat.NCHW (dimOrdering='th')
* or DataFormat.NHWC (dimOrdering='tf'). Default is NCHW.
* @tparam T The numeric type of parameter(e.g. weight, bias). Only support float/double now.
*/
class GlobalMaxPooling2D[T: ClassTag](
dimOrdering: DataFormat = DataFormat.NCHW,
inputShape: Shape = null)(implicit ev: TensorNumeric[T])
extends GlobalPooling2D[T](dimOrdering, inputShape) {
override def doBuild(inputShape: Shape): AbstractModule[Tensor[T], Tensor[T], T] = {
val input = inputShape.toSingle().toArray
val (dimH, dimW, dimC) = dimOrdering.getHWCDims(4)
val model = TSequential[T]()
val layer = SpatialMaxPooling(
kW = input(dimW -1),
kH = input(dimH -1),
dW = input(dimW -1),
dH = input(dimH -1),
format = dimOrdering)
model.add(layer)
model.add(Squeeze(dimW))
model.add(Squeeze(dimH))
model.asInstanceOf[AbstractModule[Tensor[T], Tensor[T], T]]
}
}
object GlobalMaxPooling2D {
def apply[@specialized(Float, Double) T: ClassTag](
dimOrdering: String = "th",
inputShape: Shape = null)(implicit ev: TensorNumeric[T]): GlobalMaxPooling2D[T] = {
new GlobalMaxPooling2D[T](KerasUtils.toBigDLFormat(dimOrdering), inputShape)
}
}