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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 java.util.Collections;
import java.util.List;
/**
* @author bratseth
*/
public class Argmin extends CompositeTensorFunction {
private final TensorFunction argument;
private final String dimension;
public Argmin(TensorFunction argument, String dimension) {
this.argument = argument;
this.dimension = dimension;
}
@Override
public List<TensorFunction> arguments() { return Collections.singletonList(argument); }
@Override
public TensorFunction withArguments(List<TensorFunction> arguments) {
if ( arguments.size() != 1)
throw new IllegalArgumentException("Argmin must have 1 argument, got " + arguments.size());
return new Argmin(arguments.get(0), dimension);
}
@Override
public PrimitiveTensorFunction toPrimitive() {
TensorFunction primitiveArgument = argument.toPrimitive();
return new Join(primitiveArgument,
new Reduce(primitiveArgument, Reduce.Aggregator.min, dimension),
ScalarFunctions.equal());
}
@Override
public String toString(ToStringContext context) {
return "argmin(" + argument.toString(context) + ", " + dimension + ")";
}
}
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