com.intel.analytics.bigdl.nn.ops.Select.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.ops
import com.intel.analytics.bigdl.nn.abstractnn.Activity
import com.intel.analytics.bigdl.tensor.Tensor
import com.intel.analytics.bigdl.tensor.TensorNumericMath.TensorNumeric
import com.intel.analytics.bigdl.utils.Table
import scala.reflect.ClassTag
/**
* Selects elements from input, depending on given condition. The input is a table (condition, t, e)
* @tparam T Numeric type. Only support float/double now
*/
class Select[T: ClassTag]()
(implicit ev: TensorNumeric[T]) extends Operation[Table, Activity, T] {
override def updateOutput(input: Table): Activity = {
val condition = input[Tensor[Boolean]](1)
require(condition.isScalar, "only support condition as a scalar")
val t = input[Activity](2)
val e = input[Activity](3)
output = if (condition.value()) t else e
output
}
}
object Select {
def apply[T: ClassTag]()(implicit ev: TensorNumeric[T]): Select[T] = new Select[T]()
}