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// Copyright Yahoo. 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.collect.ImmutableMap;
import com.yahoo.tensor.IndexedTensor;
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.Name;
import com.yahoo.tensor.evaluation.TypeContext;
import java.util.ArrayList;
import java.util.List;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
import java.util.function.Function;
/**
* A function which is a tensor whose values are computed by individual lambda functions on evaluation.
*
* @author bratseth
*/
public abstract class DynamicTensor<NAMETYPE extends Name> extends PrimitiveTensorFunction<NAMETYPE> {
private final TensorType type;
DynamicTensor(TensorType type) {
this.type = type;
}
@Override
public TensorType type(TypeContext<NAMETYPE> context) { return type; }
@Override
public List<TensorFunction<NAMETYPE>> arguments() { return List.of(); }
public abstract List<TensorFunction<NAMETYPE>> cellGeneratorFunctions();
@Override
public TensorFunction<NAMETYPE> withArguments(List<TensorFunction<NAMETYPE>> arguments) {
if (arguments.size() != 0)
throw new IllegalArgumentException("Dynamic tensors must have 0 arguments, got " + arguments.size());
return this;
}
@Override
public PrimitiveTensorFunction<NAMETYPE> toPrimitive() { return this; }
TensorType type() { return type; }
abstract String contentToString(ToStringContext<NAMETYPE> context);
@Override
public String toString(ToStringContext<NAMETYPE> context) {
return type().toString() + ":" + contentToString(context);
}
/** Creates a dynamic tensor function. The cell addresses must match the type. */
public static <NAMETYPE extends Name> DynamicTensor<NAMETYPE> from(TensorType type, Map<TensorAddress, ScalarFunction<NAMETYPE>> cells) {
return new MappedDynamicTensor<>(type, cells);
}
/** Creates a dynamic tensor function for a bound, indexed tensor */
public static <NAMETYPE extends Name> DynamicTensor<NAMETYPE> from(TensorType type, List<ScalarFunction<NAMETYPE>> cells) {
return new IndexedDynamicTensor<>(type, cells);
}
private static class MappedDynamicTensor<NAMETYPE extends Name> extends DynamicTensor<NAMETYPE> {
private final ImmutableMap<TensorAddress, ScalarFunction<NAMETYPE>> cells;
MappedDynamicTensor(TensorType type, Map<TensorAddress, ScalarFunction<NAMETYPE>> cells) {
super(type);
this.cells = ImmutableMap.copyOf(cells);
}
public List<TensorFunction<NAMETYPE>> cellGeneratorFunctions() {
var result = new ArrayList<TensorFunction<NAMETYPE>>();
for (var fun : cells.values()) {
fun.asTensorFunction().ifPresent(tf -> result.add(tf));
}
return result;
}
public TensorFunction<NAMETYPE> withTransformedFunctions(
Function<ScalarFunction<NAMETYPE>, ScalarFunction<NAMETYPE>> transformer)
{
Map<TensorAddress, ScalarFunction<NAMETYPE>> transformedCells = new LinkedHashMap<>();
for (var orig : cells.entrySet()) {
var transformed = transformer.apply(orig.getValue());
transformedCells.put(orig.getKey(), transformed);
}
return new MappedDynamicTensor<>(type(), transformedCells);
}
@Override
public Tensor evaluate(EvaluationContext<NAMETYPE> context) {
Tensor.Builder builder = Tensor.Builder.of(type());
for (var cell : cells.entrySet())
builder.cell(cell.getKey(), cell.getValue().apply(context));
return builder.build();
}
@Override
String contentToString(ToStringContext<NAMETYPE> context) {
if (type().dimensions().isEmpty()) {
if (cells.isEmpty()) return "{}";
return "{" + cells.values().iterator().next().toString(context) + "}";
}
StringBuilder b = new StringBuilder("{");
for (var cell : cells.entrySet()) {
b.append(cell.getKey().toString(type())).append(":").append(cell.getValue().toString(context));
b.append(",");
}
if (b.length() > 1)
b.setLength(b.length() - 1);
b.append("}");
return b.toString();
}
@Override
public int hashCode() { return Objects.hash("mappedDynamicTensor", type(), cells); }
}
private static class IndexedDynamicTensor<NAMETYPE extends Name> extends DynamicTensor<NAMETYPE> {
private final List<ScalarFunction<NAMETYPE>> cells;
IndexedDynamicTensor(TensorType type, List<ScalarFunction<NAMETYPE>> cells) {
super(type);
if ( ! type.dimensions().stream().allMatch(d -> d.type() == TensorType.Dimension.Type.indexedBound))
throw new IllegalArgumentException("A dynamic tensor can only be created from a list if the type has " +
"only indexed, bound dimensions, but this has " + type);
this.cells = List.copyOf(cells);
}
public List<TensorFunction<NAMETYPE>> cellGeneratorFunctions() {
var result = new ArrayList<TensorFunction<NAMETYPE>>();
for (var fun : cells) {
fun.asTensorFunction().ifPresent(tf -> result.add(tf));
}
return result;
}
public TensorFunction<NAMETYPE> withTransformedFunctions(
Function<ScalarFunction<NAMETYPE>, ScalarFunction<NAMETYPE>> transformer)
{
List<ScalarFunction<NAMETYPE>> transformedCells = new ArrayList<>();
for (var orig : cells) {
var transformed = transformer.apply(orig);
transformedCells.add(transformed);
}
return new IndexedDynamicTensor<>(type(), transformedCells);
}
@Override
public Tensor evaluate(EvaluationContext<NAMETYPE> context) {
IndexedTensor.BoundBuilder builder = (IndexedTensor.BoundBuilder)Tensor.Builder.of(type());
for (int i = 0; i < cells.size(); i++)
builder.cellByDirectIndex(i, cells.get(i).apply(context));
return builder.build();
}
@Override
String contentToString(ToStringContext<NAMETYPE> context) {
if (type().dimensions().isEmpty()) {
if (cells.isEmpty()) return "{}";
return "{" + cells.get(0).toString(context) + "}";
}
IndexedTensor.Indexes indexes = IndexedTensor.Indexes.of(type());
StringBuilder b = new StringBuilder("{");
for (var cell : cells) {
indexes.next();
b.append(indexes.toAddress().toString(type())).append(":").append(cell.toString(context));
b.append(",");
}
if (b.length() > 1)
b.setLength(b.length() - 1);
b.append("}");
return b.toString();
}
@Override
public int hashCode() { return Objects.hash("indexedDynamicTensor", type(), cells); }
}
}
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