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Last active Jul 26, 2017

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Momentum.sc
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MIT License
Copyright (c) 2017 ThoughtWorks Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
trait Momentum extends INDArrayWeights {
trait INDArrayWeightApi extends super.INDArrayWeightApi {
this: INDArrayWeight =>
def mu: scala.Double = 0.9
var v: INDArray = Nd4j.zeros(data.shape: _*)
}
override type INDArrayWeight <: INDArrayWeightApi with Weight
trait INDArrayOptimizerApi extends super.INDArrayOptimizerApi {
this: INDArrayOptimizer =>
private lazy val delta0: INDArray = {
import org.nd4s.Implicits._
import weight._
v = super.delta + v * mu
v
}
abstract override def delta: INDArray = delta0
}
override type INDArrayOptimizer <: INDArrayOptimizerApi with Optimizer
}
trait NesterovMomentum extends Momentum {
trait INDArrayOptimizerApi extends super.INDArrayOptimizerApi {
this: INDArrayOptimizer =>
abstract override lazy val delta: INDArray = {
import org.nd4s.Implicits._
import weight._
val vPrev = v
vPrev * (-mu) + super.delta * (1 + mu)
}
}
override type INDArrayOptimizer <: INDArrayOptimizerApi with Optimizer
}
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