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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.tensor;
import com.yahoo.tensor.evaluation.MapEvaluationContext;
import com.yahoo.tensor.evaluation.Name;
import com.yahoo.tensor.evaluation.VariableTensor;
import com.yahoo.tensor.functions.ConstantTensor;
import com.yahoo.tensor.functions.Join;
import com.yahoo.tensor.functions.Reduce;
import com.yahoo.tensor.functions.TensorFunction;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Microbenchmark of tensor operations.
*
* @author bratseth
*/
public class TensorFunctionBenchmark {
private final static Random random = new Random();
public double benchmark(int iterations, List<Tensor> modelVectors, TensorType.Dimension.Type dimensionType,
boolean extraSpace) {
Tensor queryVector = vectors(1, 300, dimensionType).get(0);
if (extraSpace) {
queryVector = queryVector.multiply(unitVector("j"));
modelVectors = modelVectors.stream().map(t -> t.multiply(unitVector("k"))).toList();
}
dotProduct(queryVector, modelVectors, Math.max(iterations/10, 10)); // warmup
System.gc();
long startTime = System.currentTimeMillis();
dotProduct(queryVector, modelVectors, iterations);
long totalTime = System.currentTimeMillis() - startTime;
return (double)totalTime / (double)iterations;
}
private Tensor unitVector(String dimension) {
return Tensor.Builder.of(new TensorType.Builder().indexed(dimension, 1).build())
.cell().label(dimension, 0).value(1).build();
}
private double dotProduct(Tensor tensor, List<Tensor> tensors, int iterations) {
double result = 0;
for (int i = 0 ; i < iterations; i++)
result = dotProduct(tensor, tensors);
return result;
}
private double dotProduct(Tensor tensor, List<Tensor> tensors) {
double largest = Double.MIN_VALUE;
TensorFunction<Name> dotProductFunction = new Reduce<>(new Join<>(new ConstantTensor<>(tensor),
new VariableTensor<>("argument"), (a, b) -> a * b),
Reduce.Aggregator.sum).toPrimitive();
MapEvaluationContext<Name> context = new MapEvaluationContext<>();
for (Tensor tensorElement : tensors) { // tensors.size() = 1 for larger tensor
context.put("argument", tensorElement);
double dotProduct = dotProductFunction.evaluate(context).asDouble();
if (dotProduct > largest) {
largest = dotProduct;
}
}
return largest;
}
private static List<Tensor> vectors(int vectorCount, int vectorSize, TensorType.Dimension.Type dimensionType) {
List<Tensor> tensors = new ArrayList<>();
TensorType type = vectorType(new TensorType.Builder(), "x", dimensionType, vectorSize);
for (int i = 0; i < vectorCount; i++) {
Tensor.Builder builder = Tensor.Builder.of(type);
for (int j = 0; j < vectorSize; j++) {
builder.cell().label("x", j).value(random.nextDouble());
}
tensors.add(builder.build());
}
return tensors;
}
private static List<Tensor> matrix(int vectorCount, int vectorSize, TensorType.Dimension.Type dimensionType) {
TensorType.Builder typeBuilder = new TensorType.Builder();
typeBuilder.dimension("i", dimensionType == TensorType.Dimension.Type.indexedBound ? TensorType.Dimension.Type.indexedUnbound : dimensionType);
vectorType(typeBuilder, "x", dimensionType, vectorSize);
Tensor.Builder builder = Tensor.Builder.of(typeBuilder.build());
for (int i = 0; i < vectorCount; i++) {
for (int j = 0; j < vectorSize; j++) {
builder.cell()
.label("i", i)
.label("x", j)
.value(random.nextDouble());
}
}
return List.of(builder.build());
}
private static TensorType vectorType(TensorType.Builder builder, String name, TensorType.Dimension.Type type, int size) {
switch (type) {
case mapped: builder.mapped(name); break;
case indexedUnbound: builder.indexed(name); break;
case indexedBound: builder.indexed(name, size); break;
default: throw new IllegalArgumentException("Dimension type " + type + " not supported");
}
return builder.build();
}
public static void main(String[] args) {
double time = 0;
// ---------------- Indexed unbound:
time = new TensorFunctionBenchmark().benchmark(50000, vectors(100, 300, TensorType.Dimension.Type.indexedUnbound), TensorType.Dimension.Type.indexedUnbound, false);
System.out.printf("Indexed unbound vectors, time per join: %1$8.3f ms\n", time);
time = new TensorFunctionBenchmark().benchmark(50000, matrix(100, 300, TensorType.Dimension.Type.indexedUnbound), TensorType.Dimension.Type.indexedUnbound, false);
System.out.printf("Indexed unbound matrix, time per join: %1$8.3f ms\n", time);
// ---------------- Indexed bound:
time = new TensorFunctionBenchmark().benchmark(50000, vectors(100, 300, TensorType.Dimension.Type.indexedBound), TensorType.Dimension.Type.indexedBound, false);
System.out.printf("Indexed bound vectors, time per join: %1$8.3f ms\n", time);
time = new TensorFunctionBenchmark().benchmark(50000, matrix(100, 300, TensorType.Dimension.Type.indexedBound), TensorType.Dimension.Type.indexedBound, false);
System.out.printf("Indexed bound matrix, time per join: %1$8.3f ms\n", time);
// ---------------- Mapped:
time = new TensorFunctionBenchmark().benchmark(5000, vectors(100, 300, TensorType.Dimension.Type.mapped), TensorType.Dimension.Type.mapped, false);
System.out.printf("Mapped vectors, time per join: %1$8.3f ms\n", time);
time = new TensorFunctionBenchmark().benchmark(1000, matrix(100, 300, TensorType.Dimension.Type.mapped), TensorType.Dimension.Type.mapped, false);
System.out.printf("Mapped matrix, time per join: %1$8.3f ms\n", time);
// ---------------- Indexed (unbound) with extra space (sidesteps current special-case optimizations):
time = new TensorFunctionBenchmark().benchmark(500, vectors(100, 300, TensorType.Dimension.Type.indexedUnbound), TensorType.Dimension.Type.indexedUnbound, true);
System.out.printf("Indexed vectors, x space time per join: %1$8.3f ms\n", time);
time = new TensorFunctionBenchmark().benchmark(500, matrix(100, 300, TensorType.Dimension.Type.indexedUnbound), TensorType.Dimension.Type.indexedUnbound, true);
System.out.printf("Indexed matrix, x space time per join: %1$8.3f ms\n", time);
// ---------------- Mapped with extra space (sidesteps current special-case optimizations):
time = new TensorFunctionBenchmark().benchmark(1000, vectors(100, 300, TensorType.Dimension.Type.mapped), TensorType.Dimension.Type.mapped, true);
System.out.printf("Mapped vectors, x space time per join: %1$8.3f ms\n", time);
time = new TensorFunctionBenchmark().benchmark(1000, matrix(100, 300, TensorType.Dimension.Type.mapped), TensorType.Dimension.Type.mapped, true);
System.out.printf("Mapped matrix, x space time per join: %1$8.3f ms\n", time);
/* 2.4Ghz Intel Core i9, Macbook Pro 2019
Indexed unbound vectors, time per join: 0,066 ms
Indexed unbound matrix, time per join: 0,108 ms
Indexed bound vectors, time per join: 0,068 ms
Indexed bound matrix, time per join: 0,106 ms
Mapped vectors, time per join: 0,845 ms
Mapped matrix, time per join: 1,779 ms
Indexed vectors, x space time per join: 5,778 ms
Indexed matrix, x space time per join: 3,342 ms
Mapped vectors, x space time per join: 8,184 ms
Mapped matrix, x space time per join: 11,547 ms
*/
}
}
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