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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.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorAddress;
import com.yahoo.tensor.TensorType;
import com.yahoo.tensor.evaluation.EvaluationContext;
import com.yahoo.tensor.evaluation.TypeContext;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.function.DoubleUnaryOperator;
/**
* The <i>map</i> tensor function produces a tensor where the given function is applied on each cell value.
*
* @author bratseth
*/
public class Map extends PrimitiveTensorFunction {
private final TensorFunction argument;
private final DoubleUnaryOperator mapper;
public Map(TensorFunction argument, DoubleUnaryOperator mapper) {
Objects.requireNonNull(argument, "The argument tensor cannot be null");
Objects.requireNonNull(mapper, "The argument function cannot be null");
this.argument = argument;
this.mapper = mapper;
}
public static TensorType outputType(TensorType inputType) { return inputType; }
public TensorFunction argument() { return argument; }
public DoubleUnaryOperator mapper() { return mapper; }
@Override
public List<TensorFunction> arguments() { return Collections.singletonList(argument); }
@Override
public TensorFunction withArguments(List<TensorFunction> arguments) {
if ( arguments.size() != 1)
throw new IllegalArgumentException("Map must have 1 argument, got " + arguments.size());
return new Map(arguments.get(0), mapper);
}
@Override
public PrimitiveTensorFunction toPrimitive() {
return new Map(argument.toPrimitive(), mapper);
}
@Override
public <NAMETYPE extends TypeContext.Name> TensorType type(TypeContext<NAMETYPE> context) {
return argument.type(context);
}
@Override
public <NAMETYPE extends TypeContext.Name> Tensor evaluate(EvaluationContext<NAMETYPE> context) {
Tensor argument = argument().evaluate(context);
Tensor.Builder builder = Tensor.Builder.of(argument.type());
for (Iterator<Tensor.Cell> i = argument.cellIterator(); i.hasNext(); ) {
java.util.Map.Entry<TensorAddress, Double> cell = i.next();
builder.cell(cell.getKey(), mapper.applyAsDouble(cell.getValue()));
}
return builder.build();
}
@Override
public String toString(ToStringContext context) {
return "map(" + argument.toString(context) + ", " + mapper + ")";
}
}
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