diff --git a/cpp/subprojects/boosting/src/mlrl/boosting/data/matrix_c_contiguous_numeric.cpp b/cpp/subprojects/boosting/src/mlrl/boosting/data/matrix_c_contiguous_numeric.cpp
index 87f76b081f..b876d95ffe 100644
--- a/cpp/subprojects/boosting/src/mlrl/boosting/data/matrix_c_contiguous_numeric.cpp
+++ b/cpp/subprojects/boosting/src/mlrl/boosting/data/matrix_c_contiguous_numeric.cpp
@@ -68,6 +68,7 @@ namespace boosting {
 
     template class NumericCContiguousMatrix<uint8>;
     template class NumericCContiguousMatrix<uint32>;
+    template class NumericCContiguousMatrix<int32>;
     template class NumericCContiguousMatrix<int64>;
     template class NumericCContiguousMatrix<float32>;
     template class NumericCContiguousMatrix<float64>;
diff --git a/cpp/subprojects/boosting/src/mlrl/boosting/data/matrix_sparse_set_numeric.cpp b/cpp/subprojects/boosting/src/mlrl/boosting/data/matrix_sparse_set_numeric.cpp
index 8b9e80e4d6..886a28fe6e 100644
--- a/cpp/subprojects/boosting/src/mlrl/boosting/data/matrix_sparse_set_numeric.cpp
+++ b/cpp/subprojects/boosting/src/mlrl/boosting/data/matrix_sparse_set_numeric.cpp
@@ -70,6 +70,7 @@ namespace boosting {
 
     template class NumericSparseSetMatrix<uint8>;
     template class NumericSparseSetMatrix<uint32>;
+    template class NumericSparseSetMatrix<int32>;
     template class NumericSparseSetMatrix<int64>;
     template class NumericSparseSetMatrix<float32>;
     template class NumericSparseSetMatrix<float64>;
diff --git a/cpp/subprojects/boosting/src/mlrl/boosting/iterator/diagonal_iterator.cpp b/cpp/subprojects/boosting/src/mlrl/boosting/iterator/diagonal_iterator.cpp
index 324fe12a02..0a5abb693c 100644
--- a/cpp/subprojects/boosting/src/mlrl/boosting/iterator/diagonal_iterator.cpp
+++ b/cpp/subprojects/boosting/src/mlrl/boosting/iterator/diagonal_iterator.cpp
@@ -59,6 +59,7 @@ namespace boosting {
 
     template class DiagonalConstIterator<uint8>;
     template class DiagonalConstIterator<uint32>;
+    template class DiagonalConstIterator<int32>;
     template class DiagonalConstIterator<int64>;
     template class DiagonalConstIterator<float32>;
     template class DiagonalConstIterator<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/list_of_lists.cpp b/cpp/subprojects/common/src/mlrl/common/data/list_of_lists.cpp
index 73c438623e..d3f219882f 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/list_of_lists.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/list_of_lists.cpp
@@ -58,31 +58,37 @@ void ListOfLists<T>::clear() {
 
 template class ListOfLists<uint8>;
 template class ListOfLists<uint32>;
+template class ListOfLists<int32>;
 template class ListOfLists<int64>;
 template class ListOfLists<float32>;
 template class ListOfLists<float64>;
 template class ListOfLists<IndexedValue<uint8>>;
 template class ListOfLists<IndexedValue<uint32>>;
+template class ListOfLists<IndexedValue<int32>>;
 template class ListOfLists<IndexedValue<int64>>;
 template class ListOfLists<IndexedValue<float32>>;
 template class ListOfLists<IndexedValue<float64>>;
 template class ListOfLists<Tuple<uint8>>;
 template class ListOfLists<Tuple<uint32>>;
+template class ListOfLists<Tuple<int32>>;
 template class ListOfLists<Tuple<int64>>;
 template class ListOfLists<Tuple<float32>>;
 template class ListOfLists<Tuple<float64>>;
 template class ListOfLists<IndexedValue<Tuple<uint8>>>;
 template class ListOfLists<IndexedValue<Tuple<uint32>>>;
+template class ListOfLists<IndexedValue<Tuple<int32>>>;
 template class ListOfLists<IndexedValue<Tuple<int64>>>;
 template class ListOfLists<IndexedValue<Tuple<float32>>>;
 template class ListOfLists<IndexedValue<Tuple<float64>>>;
 template class ListOfLists<Triple<uint8>>;
 template class ListOfLists<Triple<uint32>>;
+template class ListOfLists<Triple<int32>>;
 template class ListOfLists<Triple<int64>>;
 template class ListOfLists<Triple<float32>>;
 template class ListOfLists<Triple<float64>>;
 template class ListOfLists<IndexedValue<Triple<uint8>>>;
 template class ListOfLists<IndexedValue<Triple<uint32>>>;
+template class ListOfLists<IndexedValue<Triple<int32>>>;
 template class ListOfLists<IndexedValue<Triple<int64>>>;
 template class ListOfLists<IndexedValue<Triple<float32>>>;
 template class ListOfLists<IndexedValue<Triple<float64>>>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/matrix_c_contiguous.cpp b/cpp/subprojects/common/src/mlrl/common/data/matrix_c_contiguous.cpp
index 1a560a21e9..e2b5392d9a 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/matrix_c_contiguous.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/matrix_c_contiguous.cpp
@@ -18,6 +18,7 @@ CContiguousMatrix<T>::~CContiguousMatrix() {
 
 template class CContiguousMatrix<uint8>;
 template class CContiguousMatrix<uint32>;
+template class CContiguousMatrix<int32>;
 template class CContiguousMatrix<int64>;
 template class CContiguousMatrix<float32>;
 template class CContiguousMatrix<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/matrix_sparse_set.cpp b/cpp/subprojects/common/src/mlrl/common/data/matrix_sparse_set.cpp
index b0521545bb..dbc7e83d84 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/matrix_sparse_set.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/matrix_sparse_set.cpp
@@ -184,16 +184,19 @@ void SparseSetMatrix<T>::clear() {
 
 template class SparseSetMatrix<uint8>;
 template class SparseSetMatrix<uint32>;
+template class SparseSetMatrix<int32>;
 template class SparseSetMatrix<int64>;
 template class SparseSetMatrix<float32>;
 template class SparseSetMatrix<float64>;
 template class SparseSetMatrix<Tuple<uint8>>;
 template class SparseSetMatrix<Tuple<uint32>>;
+template class SparseSetMatrix<Tuple<int32>>;
 template class SparseSetMatrix<Tuple<int64>>;
 template class SparseSetMatrix<Tuple<float32>>;
 template class SparseSetMatrix<Tuple<float64>>;
 template class SparseSetMatrix<Triple<uint8>>;
 template class SparseSetMatrix<Triple<uint32>>;
+template class SparseSetMatrix<Triple<int32>>;
 template class SparseSetMatrix<Triple<int64>>;
 template class SparseSetMatrix<Triple<float32>>;
 template class SparseSetMatrix<Triple<float64>>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/ring_buffer.cpp b/cpp/subprojects/common/src/mlrl/common/data/ring_buffer.cpp
index ec9336b2ba..1666bb2371 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/ring_buffer.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/ring_buffer.cpp
@@ -51,6 +51,7 @@ std::pair<bool, T> RingBuffer<T>::push(T value) {
 
 template class RingBuffer<uint8>;
 template class RingBuffer<uint32>;
+template class RingBuffer<int32>;
 template class RingBuffer<int64>;
 template class RingBuffer<float32>;
 template class RingBuffer<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/vector_binned_dense.cpp b/cpp/subprojects/common/src/mlrl/common/data/vector_binned_dense.cpp
index 687bc12057..c6d895e3f3 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/vector_binned_dense.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/vector_binned_dense.cpp
@@ -130,6 +130,7 @@ void DenseBinnedVector<T>::setNumBins(uint32 numBins, bool freeMemory) {
 
 template class DenseBinnedVector<uint8>;
 template class DenseBinnedVector<uint32>;
+template class DenseBinnedVector<int32>;
 template class DenseBinnedVector<int64>;
 template class DenseBinnedVector<float32>;
 template class DenseBinnedVector<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/vector_dense.cpp b/cpp/subprojects/common/src/mlrl/common/data/vector_dense.cpp
index 82ba776d5d..f14632a72b 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/vector_dense.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/vector_dense.cpp
@@ -36,31 +36,37 @@ void DenseVector<T>::setNumElements(uint32 numElements, bool freeMemory) {
 
 template class DenseVector<uint8>;
 template class DenseVector<uint32>;
+template class DenseVector<int32>;
 template class DenseVector<int64>;
 template class DenseVector<float32>;
 template class DenseVector<float64>;
 template class DenseVector<IndexedValue<uint8>>;
 template class DenseVector<IndexedValue<uint32>>;
+template class DenseVector<IndexedValue<int32>>;
 template class DenseVector<IndexedValue<int64>>;
 template class DenseVector<IndexedValue<float32>>;
 template class DenseVector<IndexedValue<float64>>;
 template class DenseVector<Tuple<uint8>>;
 template class DenseVector<Tuple<uint32>>;
+template class DenseVector<Tuple<int32>>;
 template class DenseVector<Tuple<int64>>;
 template class DenseVector<Tuple<float32>>;
 template class DenseVector<Tuple<float64>>;
 template class DenseVector<IndexedValue<Tuple<uint8>>>;
 template class DenseVector<IndexedValue<Tuple<uint32>>>;
+template class DenseVector<IndexedValue<Tuple<int32>>>;
 template class DenseVector<IndexedValue<Tuple<int64>>>;
 template class DenseVector<IndexedValue<Tuple<float32>>>;
 template class DenseVector<IndexedValue<Tuple<float64>>>;
 template class DenseVector<Triple<uint8>>;
 template class DenseVector<Triple<uint32>>;
+template class DenseVector<Triple<int32>>;
 template class DenseVector<Triple<int64>>;
 template class DenseVector<Triple<float32>>;
 template class DenseVector<Triple<float64>>;
 template class DenseVector<IndexedValue<Triple<uint8>>>;
 template class DenseVector<IndexedValue<Triple<uint32>>>;
+template class DenseVector<IndexedValue<Triple<int32>>>;
 template class DenseVector<IndexedValue<Triple<int64>>>;
 template class DenseVector<IndexedValue<Triple<float32>>>;
 template class DenseVector<IndexedValue<Triple<float64>>>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/vector_dok.cpp b/cpp/subprojects/common/src/mlrl/common/data/vector_dok.cpp
index 1e48364534..c080c1c296 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/vector_dok.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/vector_dok.cpp
@@ -45,6 +45,7 @@ void DokVector<T>::clear() {
 
 template class DokVector<uint8>;
 template class DokVector<uint32>;
+template class DokVector<int32>;
 template class DokVector<int64>;
 template class DokVector<float32>;
 template class DokVector<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/vector_sparse_array.cpp b/cpp/subprojects/common/src/mlrl/common/data/vector_sparse_array.cpp
index 3c7ce9e8bd..f406e8a7af 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/vector_sparse_array.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/vector_sparse_array.cpp
@@ -272,16 +272,19 @@ typename SparseArrayVector<T>::value_const_iterator SparseArrayVector<T>::values
 
 template class SparseArrayVector<uint8>;
 template class SparseArrayVector<uint32>;
+template class SparseArrayVector<int32>;
 template class SparseArrayVector<int64>;
 template class SparseArrayVector<float32>;
 template class SparseArrayVector<float64>;
 template class SparseArrayVector<Tuple<uint8>>;
 template class SparseArrayVector<Tuple<uint32>>;
+template class SparseArrayVector<Tuple<int32>>;
 template class SparseArrayVector<Tuple<int64>>;
 template class SparseArrayVector<Tuple<float32>>;
 template class SparseArrayVector<Tuple<float64>>;
 template class SparseArrayVector<Triple<uint8>>;
 template class SparseArrayVector<Triple<uint32>>;
+template class SparseArrayVector<Triple<int32>>;
 template class SparseArrayVector<Triple<int64>>;
 template class SparseArrayVector<Triple<float32>>;
 template class SparseArrayVector<Triple<float64>>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/vector_sparse_arrays.cpp b/cpp/subprojects/common/src/mlrl/common/data/vector_sparse_arrays.cpp
index ae2ffae2ec..acdad86425 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/vector_sparse_arrays.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/vector_sparse_arrays.cpp
@@ -51,6 +51,7 @@ uint32 SparseArraysVector<T>::getNumElements() const {
 
 template class SparseArraysVector<uint8>;
 template class SparseArraysVector<uint32>;
+template class SparseArraysVector<int32>;
 template class SparseArraysVector<int64>;
 template class SparseArraysVector<float32>;
 template class SparseArraysVector<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/view_c_contiguous.cpp b/cpp/subprojects/common/src/mlrl/common/data/view_c_contiguous.cpp
index 38e48aaebc..0536f6c43d 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/view_c_contiguous.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/view_c_contiguous.cpp
@@ -28,6 +28,8 @@ template class CContiguousConstView<uint8>;
 template class CContiguousConstView<const uint8>;
 template class CContiguousConstView<uint32>;
 template class CContiguousConstView<const uint32>;
+template class CContiguousConstView<int32>;
+template class CContiguousConstView<const int32>;
 template class CContiguousConstView<int64>;
 template class CContiguousConstView<const int64>;
 template class CContiguousConstView<float32>;
@@ -51,6 +53,7 @@ typename CContiguousView<T>::value_iterator CContiguousView<T>::values_end(uint3
 
 template class CContiguousView<uint8>;
 template class CContiguousView<uint32>;
+template class CContiguousView<int32>;
 template class CContiguousView<int64>;
 template class CContiguousView<float32>;
 template class CContiguousView<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/view_csc.cpp b/cpp/subprojects/common/src/mlrl/common/data/view_csc.cpp
index f845264927..c45b339b65 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/view_csc.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/view_csc.cpp
@@ -45,6 +45,8 @@ template class CscConstView<uint32>;
 template class CscConstView<const uint32>;
 template class CscConstView<int64>;
 template class CscConstView<const int64>;
+template class CscConstView<int32>;
+template class CscConstView<const int32>;
 template class CscConstView<float32>;
 template class CscConstView<const float32>;
 template class CscConstView<float64>;
@@ -76,6 +78,7 @@ typename CscView<T>::index_iterator CscView<T>::indices_end(uint32 col) {
 
 template class CscView<uint8>;
 template class CscView<uint32>;
+template class CscView<int32>;
 template class CscView<int64>;
 template class CscView<float32>;
 template class CscView<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/view_csr.cpp b/cpp/subprojects/common/src/mlrl/common/data/view_csr.cpp
index 4a261c6c47..baa77c750b 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/view_csr.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/view_csr.cpp
@@ -45,6 +45,8 @@ template class CsrConstView<uint32>;
 template class CsrConstView<const uint32>;
 template class CsrConstView<int64>;
 template class CsrConstView<const int64>;
+template class CsrConstView<int32>;
+template class CsrConstView<const int32>;
 template class CsrConstView<float32>;
 template class CsrConstView<const float32>;
 template class CsrConstView<float64>;
@@ -76,6 +78,7 @@ typename CsrView<T>::index_iterator CsrView<T>::indices_end(uint32 row) {
 
 template class CsrView<uint8>;
 template class CsrView<uint32>;
+template class CsrView<int32>;
 template class CsrView<int64>;
 template class CsrView<float32>;
 template class CsrView<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/view_fortran_contiguous.cpp b/cpp/subprojects/common/src/mlrl/common/data/view_fortran_contiguous.cpp
index 0948234770..5be2284753 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/view_fortran_contiguous.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/view_fortran_contiguous.cpp
@@ -30,6 +30,8 @@ template class FortranContiguousConstView<uint8>;
 template class FortranContiguousConstView<const uint8>;
 template class FortranContiguousConstView<uint32>;
 template class FortranContiguousConstView<const uint32>;
+template class FortranContiguousConstView<int32>;
+template class FortranContiguousConstView<const int32>;
 template class FortranContiguousConstView<int64>;
 template class FortranContiguousConstView<const int64>;
 template class FortranContiguousConstView<float32>;
@@ -53,6 +55,7 @@ typename FortranContiguousView<T>::value_iterator FortranContiguousView<T>::valu
 
 template class FortranContiguousView<uint8>;
 template class FortranContiguousView<uint32>;
+template class FortranContiguousView<int32>;
 template class FortranContiguousView<int64>;
 template class FortranContiguousView<float32>;
 template class FortranContiguousView<float64>;
diff --git a/cpp/subprojects/common/src/mlrl/common/data/view_vector.cpp b/cpp/subprojects/common/src/mlrl/common/data/view_vector.cpp
index e55db5b365..5e53806206 100644
--- a/cpp/subprojects/common/src/mlrl/common/data/view_vector.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/data/view_vector.cpp
@@ -31,6 +31,8 @@ template class VectorConstView<uint8>;
 template class VectorConstView<const uint8>;
 template class VectorConstView<uint32>;
 template class VectorConstView<const uint32>;
+template class VectorConstView<int32>;
+template class VectorConstView<const int32>;
 template class VectorConstView<int64>;
 template class VectorConstView<const int64>;
 template class VectorConstView<float32>;
@@ -39,26 +41,31 @@ template class VectorConstView<float64>;
 template class VectorConstView<const float64>;
 template class VectorConstView<IndexedValue<uint8>>;
 template class VectorConstView<IndexedValue<uint32>>;
+template class VectorConstView<IndexedValue<int32>>;
 template class VectorConstView<IndexedValue<int64>>;
 template class VectorConstView<IndexedValue<float32>>;
 template class VectorConstView<IndexedValue<float64>>;
 template class VectorConstView<Tuple<uint8>>;
 template class VectorConstView<Tuple<uint32>>;
+template class VectorConstView<Tuple<int32>>;
 template class VectorConstView<Tuple<int64>>;
 template class VectorConstView<Tuple<float32>>;
 template class VectorConstView<Tuple<float64>>;
 template class VectorConstView<IndexedValue<Tuple<uint8>>>;
 template class VectorConstView<IndexedValue<Tuple<uint32>>>;
+template class VectorConstView<IndexedValue<Tuple<int32>>>;
 template class VectorConstView<IndexedValue<Tuple<int64>>>;
 template class VectorConstView<IndexedValue<Tuple<float32>>>;
 template class VectorConstView<IndexedValue<Tuple<float64>>>;
 template class VectorConstView<Triple<uint8>>;
 template class VectorConstView<Triple<uint32>>;
+template class VectorConstView<Triple<int32>>;
 template class VectorConstView<Triple<int64>>;
 template class VectorConstView<Triple<float32>>;
 template class VectorConstView<Triple<float64>>;
 template class VectorConstView<IndexedValue<Triple<uint8>>>;
 template class VectorConstView<IndexedValue<Triple<uint32>>>;
+template class VectorConstView<IndexedValue<Triple<int32>>>;
 template class VectorConstView<IndexedValue<Triple<int64>>>;
 template class VectorConstView<IndexedValue<Triple<float32>>>;
 template class VectorConstView<IndexedValue<Triple<float64>>>;
@@ -88,31 +95,37 @@ T& VectorView<T>::operator[](uint32 pos) {
 
 template class VectorView<uint8>;
 template class VectorView<uint32>;
+template class VectorView<int32>;
 template class VectorView<int64>;
 template class VectorView<float32>;
 template class VectorView<float64>;
 template class VectorView<IndexedValue<uint8>>;
 template class VectorView<IndexedValue<uint32>>;
+template class VectorView<IndexedValue<int32>>;
 template class VectorView<IndexedValue<int64>>;
 template class VectorView<IndexedValue<float32>>;
 template class VectorView<IndexedValue<float64>>;
 template class VectorView<Tuple<uint8>>;
 template class VectorView<Tuple<uint32>>;
+template class VectorView<Tuple<int32>>;
 template class VectorView<Tuple<int64>>;
 template class VectorView<Tuple<float32>>;
 template class VectorView<Tuple<float64>>;
 template class VectorView<IndexedValue<Tuple<uint8>>>;
 template class VectorView<IndexedValue<Tuple<uint32>>>;
+template class VectorView<IndexedValue<Tuple<int32>>>;
 template class VectorView<IndexedValue<Tuple<int64>>>;
 template class VectorView<IndexedValue<Tuple<float32>>>;
 template class VectorView<IndexedValue<Tuple<float64>>>;
 template class VectorView<Triple<uint8>>;
 template class VectorView<Triple<uint32>>;
+template class VectorView<Triple<int32>>;
 template class VectorView<Triple<int64>>;
 template class VectorView<Triple<float32>>;
 template class VectorView<Triple<float64>>;
 template class VectorView<IndexedValue<Triple<uint8>>>;
 template class VectorView<IndexedValue<Triple<uint32>>>;
+template class VectorView<IndexedValue<Triple<int32>>>;
 template class VectorView<IndexedValue<Triple<int64>>>;
 template class VectorView<IndexedValue<Triple<float32>>>;
 template class VectorView<IndexedValue<Triple<float64>>>;
diff --git a/cpp/subprojects/common/src/mlrl/common/prediction/prediction_matrix_dense.cpp b/cpp/subprojects/common/src/mlrl/common/prediction/prediction_matrix_dense.cpp
index 7ae4307f94..d014002a3a 100644
--- a/cpp/subprojects/common/src/mlrl/common/prediction/prediction_matrix_dense.cpp
+++ b/cpp/subprojects/common/src/mlrl/common/prediction/prediction_matrix_dense.cpp
@@ -31,6 +31,7 @@ T* DensePredictionMatrix<T>::release() {
 
 template class DensePredictionMatrix<uint8>;
 template class DensePredictionMatrix<uint32>;
+template class DensePredictionMatrix<int32>;
 template class DensePredictionMatrix<int64>;
 template class DensePredictionMatrix<float32>;
 template class DensePredictionMatrix<float64>;