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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.rankingexpression.importer.operations;
import ai.vespa.rankingexpression.importer.DimensionRenamer;
import ai.vespa.rankingexpression.importer.OrderedTensorType;
import com.yahoo.searchlib.rankingexpression.evaluation.Value;
import com.yahoo.tensor.TensorType;
import com.yahoo.tensor.functions.TensorFunction;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
public class Constant extends IntermediateOperation {
private final String modelName;
public Constant(String modelName, String nodeName, OrderedTensorType type) {
super(modelName, nodeName, Collections.emptyList());
this.modelName = modelName;
this.type = type.rename(vespaName() + "_");
}
/** Constant names are prefixed by "modelName_" to avoid name conflicts between models */
// @Override
// public String vespaName() {
// return modelName + "_" + vespaName(name);
// }
@Override
protected OrderedTensorType lazyGetType() {
return type;
}
@Override
protected TensorFunction lazyGetFunction() {
return null; // will be added by function() since this is constant.
}
/**
* Constant values are sent in via the constantValueFunction, as the
* dimension names and thus the data layout depends on the dimension
* renaming which happens after the conversion to intermediate graph.
*/
@Override
public Optional<Value> getConstantValue() {
return Optional.ofNullable(constantValueFunction).map(func -> func.apply(type));
}
@Override
public void addDimensionNameConstraints(DimensionRenamer renamer) {
addConstraintsFrom(type, renamer);
}
@Override
public boolean isConstant() {
return true;
}
@Override
public Constant withInputs(List<IntermediateOperation> inputs) {
if ( ! inputs.isEmpty())
throw new IllegalArgumentException("Constant cannot take inputs");
Constant constant = new Constant(modelName(), name(), type);
constant.setConstantValueFunction(constantValueFunction);
return constant;
}
@Override
public String operationName() { return "Constant"; }
@Override
public String toString() {
return "Constant(" + type + ")";
}
@Override
public String toFullString() {
return "\t" + type + ":\tConstant(" + type + ")";
}
}
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