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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.tensor.functions;
import com.google.common.annotations.Beta;
import java.util.Collections;
import java.util.List;
/**
* @author bratseth
*/
@Beta
public class Softmax extends CompositeTensorFunction {
private final TensorFunction argument;
private final String dimension;
public Softmax(TensorFunction argument, String dimension) {
this.argument = argument;
this.dimension = dimension;
}
@Override
public List<TensorFunction> functionArguments() { return Collections.singletonList(argument); }
@Override
public TensorFunction replaceArguments(List<TensorFunction> arguments) {
if ( arguments.size() != 1)
throw new IllegalArgumentException("Softmax must have 1 argument, got " + arguments.size());
return new Softmax(arguments.get(0), dimension);
}
@Override
public PrimitiveTensorFunction toPrimitive() {
TensorFunction primitiveArgument = argument.toPrimitive();
return new Join(new Map(primitiveArgument, ScalarFunctions.exp()),
new Reduce(new Map(primitiveArgument, ScalarFunctions.exp()),
Reduce.Aggregator.sum,
dimension),
ScalarFunctions.divide());
}
@Override
public String toString(ToStringContext context) {
return "softmax(" + argument.toString(context) + ", " + dimension + ")";
}
}
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