com.intel.analytics.bigdl.nn.keras.AveragePooling3D.scala Maven / Gradle / Ivy

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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.keras

import com.intel.analytics.bigdl.nn.VolumetricAveragePooling
import com.intel.analytics.bigdl.nn.abstractnn.AbstractModule
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 average pooling operation for 3D data (spatial or spatio-temporal).
 * Data format currently supported for this layer is 'CHANNEL_FIRST' (dimOrdering='th').
 * Border mode currently supported for this layer is 'valid'.
 * The input of this layer should be 5D.
 *
 * 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 poolSize Int array of length 3. Factors by which to downscale (dim1, dim2, dim3).
 *                 Default is (2, 2, 2), which will halve the image in each dimension.
 * @param strides Int array of length 3. Stride values. Default is null, and in this case it will
 *                be equal to poolSize.
 * @param dimOrdering Format of input data. Please use 'CHANNEL_FIRST' (dimOrdering='th').
 * @tparam T Numeric type of parameter(e.g. weight, bias). Only support float/double now.
 */
class AveragePooling3D[T: ClassTag](
   poolSize: Array[Int] = Array(2, 2, 2),
   strides: Array[Int] = null,
   dimOrdering: String = "CHANNEL_FIRST",
   inputShape: Shape = null)(implicit ev: TensorNumeric[T])
  extends Pooling3D[T](poolSize, strides, dimOrdering, inputShape) {

  override def doBuild(inputShape: Shape): AbstractModule[Tensor[T], Tensor[T], T] = {
    val layer = VolumetricAveragePooling(
      kT = poolSize(0),
      kW = poolSize(2),
      kH = poolSize(1),
      dT = strideValues(0),
      dW = strideValues(2),
      dH = strideValues(1),
      countIncludePad = false)
    layer.asInstanceOf[AbstractModule[Tensor[T], Tensor[T], T]]
  }
}

object AveragePooling3D {
  def apply[@specialized(Float, Double) T: ClassTag](
    poolSize: (Int, Int, Int) = (2, 2, 2),
    strides: (Int, Int, Int) = null,
    dimOrdering: String = "th",
    inputShape: Shape = null)(implicit ev: TensorNumeric[T]): AveragePooling3D[T] = {
    val strideValues = if (strides != null) Array(strides._1, strides._2, strides._3)
                       else null
    new AveragePooling3D[T](Array(poolSize._1, poolSize._2, poolSize._3),
      strideValues, KerasUtils.toBigDLFormat5D(dimOrdering), inputShape)
  }
}