use direct sparse tensor builder

15 files changed, 186 insertions, 59 deletions

diff --git a/eval/CMakeLists.txt b/eval/CMakeLists.txt
index f01faa1362f..6a5e354a0c3 100644
--- a/eval/CMakeLists.txt
+++ b/eval/CMakeLists.txt
@@ -35,6 +35,7 @@ vespa_define_module(
     src/tests/tensor/dense_tensor_address_combiner
     src/tests/tensor/dense_xw_product_function
     src/tests/tensor/direct_dense_tensor_builder
+    src/tests/tensor/direct_sparse_tensor_builder
     src/tests/tensor/sparse_tensor_builder
     src/tests/tensor/tensor_add_operation
     src/tests/tensor/tensor_address
diff --git a/eval/src/tests/tensor/direct_sparse_tensor_builder/CMakeLists.txt b/eval/src/tests/tensor/direct_sparse_tensor_builder/CMakeLists.txt
new file mode 100644
index 00000000000..00ff230fadd
--- /dev/null
+++ b/eval/src/tests/tensor/direct_sparse_tensor_builder/CMakeLists.txt
@@ -0,0 +1,8 @@
+# Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+vespa_add_executable(eval_direct_sparse_tensor_builder_test_app TEST
+    SOURCES
+    direct_sparse_tensor_builder_test.cpp
+    DEPENDS
+    vespaeval
+)
+vespa_add_test(NAME eval_direct_sparse_tensor_builder_test_app COMMAND eval_direct_sparse_tensor_builder_test_app)
diff --git a/eval/src/tests/tensor/direct_sparse_tensor_builder/direct_sparse_tensor_builder_test.cpp b/eval/src/tests/tensor/direct_sparse_tensor_builder/direct_sparse_tensor_builder_test.cpp
new file mode 100644
index 00000000000..86b6abedd39
--- /dev/null
+++ b/eval/src/tests/tensor/direct_sparse_tensor_builder/direct_sparse_tensor_builder_test.cpp
@@ -0,0 +1,104 @@
+// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#include <vespa/vespalib/testkit/test_kit.h>
+#include <vespa/eval/tensor/sparse/direct_sparse_tensor_builder.h>
+#include <vespa/eval/tensor/sparse/sparse_tensor_address_combiner.h>
+#include <vespa/vespalib/test/insertion_operators.h>
+
+using namespace vespalib::tensor;
+using namespace vespalib::tensor::sparse;
+using vespalib::eval::TensorSpec;
+using vespalib::eval::ValueType;
+
+void
+assertCellValue(double expValue, const TensorAddress &address,
+                const ValueType &type,
+                const SparseTensor::Cells &cells)
+{
+    SparseTensorAddressBuilder addressBuilder;
+    auto dimsItr = type.dimensions().cbegin();
+    auto dimsItrEnd = type.dimensions().cend();
+    for (const auto &element : address.elements()) {
+        while ((dimsItr < dimsItrEnd) && (dimsItr->name < element.dimension())) {
+            addressBuilder.add("");
+            ++dimsItr;
+        }
+        assert((dimsItr != dimsItrEnd) && (dimsItr->name == element.dimension()));
+        addressBuilder.add(element.label());
+        ++dimsItr;
+    }
+    while (dimsItr < dimsItrEnd) {
+        addressBuilder.add("");
+        ++dimsItr;
+    }
+    SparseTensorAddressRef addressRef(addressBuilder.getAddressRef());
+    auto itr = cells.find(addressRef);
+    EXPECT_FALSE(itr == cells.end());
+    EXPECT_EQUAL(expValue, itr->second);
+}
+
+Tensor::UP
+buildTensor()
+{
+    DirectSparseTensorBuilder builder(ValueType::from_spec("tensor(a{},b{},c{},d{})"));
+    SparseTensorAddressBuilder address;
+    address.set({"1", "2", "", ""});
+    builder.insertCell(address, 10);
+    address.set({"", "", "3", "4"});
+    builder.insertCell(address, 20);
+    return builder.build();
+}
+
+TEST("require that tensor can be constructed")
+{
+    Tensor::UP tensor = buildTensor();
+    const SparseTensor &sparseTensor = dynamic_cast<const SparseTensor &>(*tensor);
+    const ValueType &type = sparseTensor.type();
+    const SparseTensor::Cells &cells = sparseTensor.cells();
+    EXPECT_EQUAL(2u, cells.size());
+    assertCellValue(10, TensorAddress({{"a","1"},{"b","2"}}), type, cells);
+    assertCellValue(20, TensorAddress({{"c","3"},{"d","4"}}), type, cells);
+}
+
+TEST("require that tensor can be converted to tensor spec")
+{
+    Tensor::UP tensor = buildTensor();
+    TensorSpec expSpec("tensor(a{},b{},c{},d{})");
+    expSpec.add({{"a", "1"}, {"b", "2"}, {"c", ""}, {"d", ""}}, 10).
+        add({{"a", ""},{"b",""},{"c", "3"}, {"d", "4"}}, 20);
+    TensorSpec actSpec = tensor->toSpec();
+    EXPECT_EQUAL(expSpec, actSpec);
+}
+
+TEST("require that dimensions are extracted")
+{
+    Tensor::UP tensor = buildTensor();
+    const SparseTensor &sparseTensor = dynamic_cast<const SparseTensor &>(*tensor);
+    const auto &dims = sparseTensor.type().dimensions();
+    EXPECT_EQUAL(4u, dims.size());
+    EXPECT_EQUAL("a", dims[0].name);
+    EXPECT_EQUAL("b", dims[1].name);
+    EXPECT_EQUAL("c", dims[2].name);
+    EXPECT_EQUAL("d", dims[3].name);
+    EXPECT_EQUAL("tensor(a{},b{},c{},d{})", sparseTensor.type().to_spec());
+}
+
+void verifyAddressCombiner(const ValueType & a, const ValueType & b, size_t numDim, size_t numOverlapping) {
+    TensorAddressCombiner combiner(a, b);
+    EXPECT_EQUAL(numDim, combiner.numDimensions());
+    EXPECT_EQUAL(numOverlapping, combiner.numOverlappingDimensions());
+}
+TEST("Test sparse tensor address combiner") {
+    verifyAddressCombiner(ValueType::tensor_type({{"a"}}), ValueType::tensor_type({{"b"}}), 2, 0);
+    verifyAddressCombiner(ValueType::tensor_type({{"a"}, {"b"}}), ValueType::tensor_type({{"b"}}), 2, 1);
+    verifyAddressCombiner(ValueType::tensor_type({{"a"}, {"b"}}), ValueType::tensor_type({{"b"}, {"c"}}), 3, 1);
+
+}
+
+TEST("Test essential object sizes") {
+    EXPECT_EQUAL(16u, sizeof(SparseTensorAddressRef));
+    EXPECT_EQUAL(24u, sizeof(std::pair<SparseTensorAddressRef, double>));
+    EXPECT_EQUAL(32u, sizeof(vespalib::hash_node<std::pair<SparseTensorAddressRef, double>>));
+}
+
+TEST_MAIN() { TEST_RUN_ALL(); }
diff --git a/eval/src/vespa/eval/tensor/default_tensor_engine.cpp b/eval/src/vespa/eval/tensor/default_tensor_engine.cpp
index b4b65f06d96..6210295ebd4 100644
--- a/eval/src/vespa/eval/tensor/default_tensor_engine.cpp
+++ b/eval/src/vespa/eval/tensor/default_tensor_engine.cpp
@@ -4,7 +4,8 @@
 #include "tensor.h"
 #include "wrapped_simple_tensor.h"
 #include "serialization/typed_binary_format.h"
-#include "sparse/sparse_tensor_builder.h"
+#include "sparse/sparse_tensor_address_builder.h"
+#include "sparse/direct_sparse_tensor_builder.h"
 #include "dense/dense_tensor.h"
 #include "dense/direct_dense_tensor_builder.h"
 #include "dense/dense_dot_product_function.h"
@@ -125,6 +126,24 @@ size_t calculate_cell_index(const ValueType &type, const TensorSpec::Address &ad
     return idx;
 }
 
+bool build_cell_address(const ValueType &type, const TensorSpec::Address &address,
+                        SparseTensorAddressBuilder &builder)
+{
+    if (type.dimensions().size() != address.size()) {
+        return false;
+    }
+    size_t d = 0;
+    builder.clear();
+    for (const auto &binding: address) {
+        const auto &dim = type.dimensions()[d++];
+        if (dim.name != binding.first) {
+            return false;
+        }
+        builder.add(binding.second.name);
+    }
+    return true;
+}
+
 void bad_spec(const TensorSpec &spec) {
     throw IllegalArgumentException(make_string("malformed tensor spec: %s", spec.to_string().c_str()));
 }
@@ -165,17 +184,15 @@ DefaultTensorEngine::from_spec(const TensorSpec &spec) const
         }
         return builder.build();
     } else if (type.is_sparse()) {
-        SparseTensorBuilder builder;
-        std::map<vespalib::string,SparseTensorBuilder::Dimension> dimension_map;
-        for (const auto &dimension: type.dimensions()) {
-            dimension_map[dimension.name] = builder.define_dimension(dimension.name);
-        }
+        DirectSparseTensorBuilder builder(type);
+        SparseTensorAddressBuilder address_builder;
         for (const auto &cell: spec.cells()) {
             const auto &address = cell.first;
-            for (const auto &binding: address) {
-                builder.add_label(dimension_map[binding.first], binding.second.name);
+            if (build_cell_address(type, address, address_builder)) {
+                builder.insertCell(address_builder, cell.second);
+            } else {
+                bad_spec(spec);
             }
-            builder.add_cell(cell.second);
         }
         return builder.build();
     } else if (type.is_double()) {
diff --git a/eval/src/vespa/eval/tensor/direct_tensor_builder.h b/eval/src/vespa/eval/tensor/direct_tensor_builder.h
deleted file mode 100644
index 1eb171eef6e..00000000000
--- a/eval/src/vespa/eval/tensor/direct_tensor_builder.h
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-
-#pragma once
-
-namespace vespalib::tensor {
-
-/**
- * Forward declaration of utility class to build tensor of type TensorT,
- * to be used by tensor operations.
- */
-template <typename TensorT> class DirectTensorBuilder;
-
-}
diff --git a/eval/src/vespa/eval/tensor/join_tensors.h b/eval/src/vespa/eval/tensor/join_tensors.h
index 271a6b0195d..aa493c23656 100644
--- a/eval/src/vespa/eval/tensor/join_tensors.h
+++ b/eval/src/vespa/eval/tensor/join_tensors.h
@@ -17,7 +17,7 @@ joinTensors(const TensorImplType &lhs,
             const TensorImplType &rhs,
             Function &&func)
 {
-    DirectTensorBuilder<TensorImplType>
+    DirectSparseTensorBuilder
         builder(lhs.combineDimensionsWith(rhs), lhs.cells());
     for (const auto &rhsCell : rhs.cells()) {
         builder.insertCell(rhsCell.first, rhsCell.second, func);
@@ -35,7 +35,7 @@ joinTensorsNegated(const TensorImplType &lhs,
                    const TensorImplType &rhs,
                    Function &&func)
 {
-    DirectTensorBuilder<TensorImplType>
+    DirectSparseTensorBuilder
         builder(lhs.combineDimensionsWith(rhs), lhs.cells());
     for (const auto &rhsCell : rhs.cells()) {
         builder.insertCell(rhsCell.first, -rhsCell.second, func);
diff --git a/eval/src/vespa/eval/tensor/serialization/sparse_binary_format.cpp b/eval/src/vespa/eval/tensor/serialization/sparse_binary_format.cpp
index 88f441176d5..cca310176f4 100644
--- a/eval/src/vespa/eval/tensor/serialization/sparse_binary_format.cpp
+++ b/eval/src/vespa/eval/tensor/serialization/sparse_binary_format.cpp
@@ -1,15 +1,18 @@
 // Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 
 #include "sparse_binary_format.h"
+#include <vespa/eval/eval/value_type.h>
 #include <vespa/eval/tensor/types.h>
 #include <vespa/eval/tensor/tensor.h>
-#include <vespa/eval/tensor/sparse/sparse_tensor_builder.h>
+#include <vespa/eval/tensor/sparse/direct_sparse_tensor_builder.h>
+#include <vespa/eval/tensor/sparse/sparse_tensor_address_builder.h>
 #include <vespa/eval/tensor/tensor_visitor.h>
 #include <vespa/vespalib/objects/nbostream.h>
 #include <sstream>
 #include <cassert>
 
 using vespalib::nbostream;
+using vespalib::eval::ValueType;
 
 namespace vespalib::tensor {
 
@@ -91,28 +94,36 @@ SparseBinaryFormat::serialize(nbostream &stream, const Tensor &tensor)
 }
 
 
-void
-SparseBinaryFormat::deserialize(nbostream &stream, SparseTensorBuilder &builder)
+std::unique_ptr<Tensor>
+SparseBinaryFormat::deserialize(nbostream &stream)
 {
     vespalib::string str;
     size_t dimensionsSize = stream.getInt1_4Bytes();
-    std::vector<SparseTensorBuilder::Dimension> dimensions;
+    std::vector<ValueType::Dimension> dimensions;
     while (dimensions.size() < dimensionsSize) {
         stream.readSmallString(str);
-        dimensions.emplace_back(builder.define_dimension(str));
+        dimensions.emplace_back(str);
     }
+    ValueType type = ValueType::tensor_type(std::move(dimensions));
+    DirectSparseTensorBuilder builder(type);
+    SparseTensorAddressBuilder address;
+
     size_t cellsSize = stream.getInt1_4Bytes();
     double cellValue = 0.0;
     for (size_t cellIdx = 0; cellIdx < cellsSize; ++cellIdx) {
+        address.clear();
         for (size_t dimension = 0; dimension < dimensionsSize; ++dimension) {
             stream.readSmallString(str);
             if (!str.empty()) {
-                builder.add_label(dimensions[dimension], str);
+                address.add(str);
+            } else {
+                address.addUndefined();
             }
         }
         stream >> cellValue;
-        builder.add_cell(cellValue);
+        builder.insertCell(address, cellValue);
     }
+    return builder.build();
 }
 
 
diff --git a/eval/src/vespa/eval/tensor/serialization/sparse_binary_format.h b/eval/src/vespa/eval/tensor/serialization/sparse_binary_format.h
index 1c0171a2b98..cd68e7eeda4 100644
--- a/eval/src/vespa/eval/tensor/serialization/sparse_binary_format.h
+++ b/eval/src/vespa/eval/tensor/serialization/sparse_binary_format.h
@@ -2,12 +2,13 @@
 
 #pragma once
 
+#include <memory>
+
 namespace vespalib { class nbostream; }
 
 namespace vespalib::tensor {
 
 class Tensor;
-class SparseTensorBuilder;
 
 /**
  * Class for serializing a tensor.
@@ -16,7 +17,7 @@ class SparseBinaryFormat
 {
 public:
     static void serialize(nbostream &stream, const Tensor &tensor);
-    static void deserialize(nbostream &stream, SparseTensorBuilder &builder);
+    static std::unique_ptr<Tensor> deserialize(nbostream &stream);
 };
 
 }
diff --git a/eval/src/vespa/eval/tensor/serialization/typed_binary_format.cpp b/eval/src/vespa/eval/tensor/serialization/typed_binary_format.cpp
index 4437f4e0e2f..23179d4b908 100644
--- a/eval/src/vespa/eval/tensor/serialization/typed_binary_format.cpp
+++ b/eval/src/vespa/eval/tensor/serialization/typed_binary_format.cpp
@@ -4,7 +4,6 @@
 #include "sparse_binary_format.h"
 #include "dense_binary_format.h"
 #include <vespa/vespalib/objects/nbostream.h>
-#include <vespa/eval/tensor/sparse/sparse_tensor_builder.h>
 #include <vespa/eval/tensor/tensor.h>
 #include <vespa/eval/tensor/dense/dense_tensor.h>
 #include <vespa/eval/eval/simple_tensor.h>
@@ -84,9 +83,7 @@ TypedBinaryFormat::deserialize(nbostream &stream)
     auto read_pos = stream.rp();
     auto formatId = stream.getInt1_4Bytes();
     if (formatId == SPARSE_BINARY_FORMAT_TYPE) {
-        SparseTensorBuilder builder;
-        SparseBinaryFormat::deserialize(stream, builder);
-        return builder.build();
+        return SparseBinaryFormat::deserialize(stream);
     }
     if (formatId == DENSE_BINARY_FORMAT_TYPE) {
         return DenseBinaryFormat(SerializeFormat::DOUBLE).deserialize(stream);
diff --git a/eval/src/vespa/eval/tensor/sparse/direct_sparse_tensor_builder.h b/eval/src/vespa/eval/tensor/sparse/direct_sparse_tensor_builder.h
index 89370458136..f9858e23b4d 100644
--- a/eval/src/vespa/eval/tensor/sparse/direct_sparse_tensor_builder.h
+++ b/eval/src/vespa/eval/tensor/sparse/direct_sparse_tensor_builder.h
@@ -3,7 +3,6 @@
 #pragma once
 
 #include <vespa/vespalib/util/hdr_abort.h>
-#include <vespa/eval/tensor/direct_tensor_builder.h>
 #include "sparse_tensor.h"
 #include "sparse_tensor_address_builder.h"
 #include "sparse_tensor_address_padder.h"
@@ -14,11 +13,10 @@ namespace vespalib::tensor {
  * Utility class to build tensors of type SparseTensor, to be used by
  * tensor operations.
  */
-template <> class DirectTensorBuilder<SparseTensor>
+class DirectSparseTensorBuilder
 {
 public:
-    using TensorImplType = SparseTensor;
-    using Cells = typename TensorImplType::Cells;
+    using Cells = SparseTensor::Cells;
     using AddressBuilderType = SparseTensorAddressBuilder;
     using AddressRefType = SparseTensorAddressRef;
 
@@ -50,32 +48,32 @@ public:
         }
     }
 
-    DirectTensorBuilder()
-        : _stash(TensorImplType::STASH_CHUNK_SIZE),
+    DirectSparseTensorBuilder()
+        : _stash(SparseTensor::STASH_CHUNK_SIZE),
           _type(eval::ValueType::double_type()),
           _cells()
     {
     }
 
-    DirectTensorBuilder(const eval::ValueType &type_in)
-        : _stash(TensorImplType::STASH_CHUNK_SIZE),
+    DirectSparseTensorBuilder(const eval::ValueType &type_in)
+        : _stash(SparseTensor::STASH_CHUNK_SIZE),
           _type(type_in),
           _cells()
     {
     }
 
-    DirectTensorBuilder(const eval::ValueType &type_in, const Cells &cells_in)
-        : _stash(TensorImplType::STASH_CHUNK_SIZE),
+    DirectSparseTensorBuilder(const eval::ValueType &type_in, const Cells &cells_in)
+        : _stash(SparseTensor::STASH_CHUNK_SIZE),
           _type(type_in),
           _cells()
     {
         copyCells(cells_in);
     }
 
-    DirectTensorBuilder(const eval::ValueType &type_in,
+    DirectSparseTensorBuilder(const eval::ValueType &type_in,
                         const Cells &cells_in,
                         const eval::ValueType &cells_in_type)
-        : _stash(TensorImplType::STASH_CHUNK_SIZE),
+        : _stash(SparseTensor::STASH_CHUNK_SIZE),
           _type(type_in),
           _cells()
     {
@@ -86,7 +84,7 @@ public:
         }
     }
 
-    ~DirectTensorBuilder() {}
+    ~DirectSparseTensorBuilder() {};
 
     Tensor::UP build() {
         return std::make_unique<SparseTensor>(std::move(_type), std::move(_cells), std::move(_stash));
diff --git a/eval/src/vespa/eval/tensor/sparse/sparse_tensor_address_builder.h b/eval/src/vespa/eval/tensor/sparse/sparse_tensor_address_builder.h
index a6f05bb70fb..e053caf8604 100644
--- a/eval/src/vespa/eval/tensor/sparse/sparse_tensor_address_builder.h
+++ b/eval/src/vespa/eval/tensor/sparse/sparse_tensor_address_builder.h
@@ -43,6 +43,12 @@ public:
     }
     void addUndefined() { _address.push_back('\0'); }
     void clear() { _address.clear(); }
+    void set(std::initializer_list<vespalib::stringref> labels) {
+        clear();
+        for (const auto &label: labels) {
+            add(label);
+        }
+    }
     SparseTensorAddressRef getAddressRef() const {
         return SparseTensorAddressRef(&_address[0], _address.size());
     }
diff --git a/eval/src/vespa/eval/tensor/sparse/sparse_tensor_apply.hpp b/eval/src/vespa/eval/tensor/sparse/sparse_tensor_apply.hpp
index 2027e0afc9d..9d619f0f41a 100644
--- a/eval/src/vespa/eval/tensor/sparse/sparse_tensor_apply.hpp
+++ b/eval/src/vespa/eval/tensor/sparse/sparse_tensor_apply.hpp
@@ -4,7 +4,6 @@
 
 #include "sparse_tensor_apply.h"
 #include "sparse_tensor_address_combiner.h"
-#include <vespa/eval/tensor/direct_tensor_builder.h>
 #include "direct_sparse_tensor_builder.h"
 
 namespace vespalib::tensor::sparse {
@@ -13,7 +12,7 @@ template <typename Function>
 std::unique_ptr<Tensor>
 apply(const SparseTensor &lhs, const SparseTensor &rhs, Function &&func)
 {
-    DirectTensorBuilder<SparseTensor> builder(lhs.combineDimensionsWith(rhs));
+    DirectSparseTensorBuilder builder(lhs.combineDimensionsWith(rhs));
     TensorAddressCombiner addressCombiner(lhs.fast_type(), rhs.fast_type());
     size_t estimatedCells = (lhs.cells().size() * rhs.cells().size());
     if (addressCombiner.numOverlappingDimensions() != 0) {
diff --git a/eval/src/vespa/eval/tensor/sparse/sparse_tensor_reduce.hpp b/eval/src/vespa/eval/tensor/sparse/sparse_tensor_reduce.hpp
index 8a43c6b52bd..2016dc2207a 100644
--- a/eval/src/vespa/eval/tensor/sparse/sparse_tensor_reduce.hpp
+++ b/eval/src/vespa/eval/tensor/sparse/sparse_tensor_reduce.hpp
@@ -3,7 +3,6 @@
 #pragma once
 
 #include "sparse_tensor_address_reducer.h"
-#include <vespa/eval/tensor/direct_tensor_builder.h>
 #include "direct_sparse_tensor_builder.h"
 
 namespace vespalib::tensor::sparse {
@@ -11,7 +10,7 @@ namespace vespalib::tensor::sparse {
 template <typename Function>
 std::unique_ptr<Tensor>
 reduceAll(const SparseTensor &tensor,
-          DirectTensorBuilder<SparseTensor> &builder, Function &&func)
+          DirectSparseTensorBuilder &builder, Function &&func)
 {
     auto itr = tensor.cells().begin();
     auto itrEnd = tensor.cells().end();
@@ -31,7 +30,7 @@ template <typename Function>
 std::unique_ptr<Tensor>
 reduceAll(const SparseTensor &tensor, Function &&func)
 {
-    DirectTensorBuilder<SparseTensor> builder;
+    DirectSparseTensorBuilder builder;
     return reduceAll(tensor, builder, func);
 }
 
@@ -43,7 +42,7 @@ reduce(const SparseTensor &tensor,
     if (dimensions.empty()) {
         return reduceAll(tensor, func);
     }
-    DirectTensorBuilder<SparseTensor> builder(tensor.fast_type().reduce(dimensions));
+    DirectSparseTensorBuilder builder(tensor.fast_type().reduce(dimensions));
     if (builder.fast_type().dimensions().empty()) {
         return reduceAll(tensor, builder, func);
     }
diff --git a/eval/src/vespa/eval/tensor/tensor_mapper.cpp b/eval/src/vespa/eval/tensor/tensor_mapper.cpp
index c7bd8173d51..6f2b094af9e 100644
--- a/eval/src/vespa/eval/tensor/tensor_mapper.cpp
+++ b/eval/src/vespa/eval/tensor/tensor_mapper.cpp
@@ -23,7 +23,7 @@ namespace {
 template <class TensorT>
 class SparseTensorMapper : public TensorVisitor
 {
-    using Builder = DirectTensorBuilder<TensorT>;
+    using Builder = DirectSparseTensorBuilder;
     using AddressBuilderType = typename Builder::AddressBuilderType;
 
     Builder _builder;
diff --git a/eval/src/vespa/eval/tensor/tensor_operation.h b/eval/src/vespa/eval/tensor/tensor_operation.h
index 827c16573d5..0532fe3efa0 100644
--- a/eval/src/vespa/eval/tensor/tensor_operation.h
+++ b/eval/src/vespa/eval/tensor/tensor_operation.h
@@ -2,7 +2,6 @@
 
 #pragma once
 
-#include "direct_tensor_builder.h"
 #include <vespa/eval/tensor/sparse/direct_sparse_tensor_builder.h>
 
 namespace vespalib::tensor {
@@ -15,7 +14,7 @@ class TensorOperation
 {
 public:
     using TensorImplType = TensorT;
-    using MyTensorBuilder = DirectTensorBuilder<TensorT>;
+    using MyTensorBuilder = DirectSparseTensorBuilder;
     using Cells = typename TensorImplType::Cells;
     using AddressBuilderType = typename MyTensorBuilder::AddressBuilderType;
     using AddressRefType = typename MyTensorBuilder::AddressRefType;