org.nd4j.weightinit.impl.XavierUniformInitScheme Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.nd4j.weightinit.impl;
import lombok.Builder;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.weightinit.BaseWeightInitScheme;
import org.nd4j.weightinit.WeightInit;
/**
* Initialize the weight to:
* //As per Glorot and Bengio 2010: Uniform distribution U(-s,s) with s = sqrt(6/(fanIn + fanOut))
* Eq 16: http://jmlr.org/proceedings/papers/v9/glorot10a/glorot10a.pdf
*/
public class XavierUniformInitScheme extends BaseWeightInitScheme {
private double fanIn;
private double fanOut;
@Builder
public XavierUniformInitScheme(char order, double fanIn, double fanOut) {
super(order);
this.fanIn = fanIn;
this.fanOut = fanOut;
}
@Override
public INDArray doCreate(DataType dataType, long[] shape, INDArray paramsView) {
//As per Glorot and Bengio 2010: Uniform distribution U(-s,s) with s = sqrt(6/(fanIn + fanOut))
//Eq 16: http://jmlr.org/proceedings/papers/v9/glorot10a/glorot10a.pdf
double s = Math.sqrt(6.0) / Math.sqrt(fanIn + fanOut);
return Nd4j.rand(Nd4j.getDistributions().createUniform(-s, s), shape);
}
@Override
public WeightInit type() {
return WeightInit.XAVIER_UNIFORM;
}
}