Drop thrust/functional it is almost not used at all

cpp/src/dbscan/vertexdeg/algo.cuh

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: Copyright (c) 2018-2025, NVIDIA CORPORATION.
+ * SPDX-FileCopyrightText: Copyright (c) 2018-2026, NVIDIA CORPORATION.
  * SPDX-License-Identifier: Apache-2.0
  */
 
@@ -20,11 +20,6 @@
 #include <rmm/device_uvector.hpp>
 
 #include <cuda_runtime.h>
-#include <thrust/execution_policy.h>
-#include <thrust/functional.h>
-#include <thrust/iterator/constant_iterator.h>
-#include <thrust/iterator/counting_iterator.h>
-#include <thrust/transform.h>
 
 #include <cuvs/neighbors/ball_cover.hpp>
 #include <cuvs/neighbors/epsilon_neighborhood.hpp>

cpp/src/genetic/fitness.cuh

@@ -24,7 +24,6 @@
 #include <thrust/copy.h>
 #include <thrust/device_ptr.h>
 #include <thrust/device_vector.h>
-#include <thrust/functional.h>
 #include <thrust/iterator/permutation_iterator.h>
 #include <thrust/memory.h>
 #include <thrust/scan.h>

cpp/src/glm/qn/glm_base.cuh

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: Copyright (c) 2018-2025, NVIDIA CORPORATION.
+ * SPDX-FileCopyrightText: Copyright (c) 2018-2026, NVIDIA CORPORATION.
  * SPDX-License-Identifier: Apache-2.0
  */
 
@@ -17,7 +17,6 @@
 
 #include <cuda/std/functional>
 #include <thrust/execution_policy.h>
-#include <thrust/functional.h>
 #include <thrust/reduce.h>
 
 #include <vector>

cpp/src/hdbscan/condensed_hierarchy.cu

@@ -21,7 +21,6 @@
 #include <thrust/device_ptr.h>
 #include <thrust/execution_policy.h>
 #include <thrust/extrema.h>
-#include <thrust/functional.h>
 #include <thrust/iterator/zip_iterator.h>
 #include <thrust/reduce.h>
 #include <thrust/sort.h>

cpp/src/hdbscan/detail/select.cuh

@@ -25,7 +25,6 @@
 #include <thrust/execution_policy.h>
 #include <thrust/fill.h>
 #include <thrust/for_each.h>
-#include <thrust/functional.h>
 #include <thrust/iterator/counting_iterator.h>
 #include <thrust/iterator/zip_iterator.h>
 #include <thrust/reduce.h>

cpp/src/hdbscan/detail/utils.h

@@ -28,7 +28,6 @@
 #include <thrust/copy.h>
 #include <thrust/execution_policy.h>
 #include <thrust/for_each.h>
-#include <thrust/functional.h>
 #include <thrust/iterator/zip_iterator.h>
 #include <thrust/reduce.h>
 #include <thrust/sort.h>

cpp/src/tsa/auto_arima.cuh

@@ -16,10 +16,10 @@
 
 #include <cub/cub.cuh>
 #include <cuda/iterator>
+#include <cuda/std/functional>
 #include <cuda_runtime.h>
 #include <thrust/execution_policy.h>
 #include <thrust/for_each.h>
-#include <thrust/functional.h>
 #include <thrust/iterator/counting_iterator.h>
 #include <thrust/scan.h>
 #include <thrust/transform.h>
@@ -77,7 +77,7 @@ inline int divide_by_mask_build_index(const bool* d_mask,
                     d_mask,
                     d_mask + batch_size,
                     inv_mask.data(),
-                    thrust::logical_not<bool>());
+                    cuda::std::logical_not<bool>());
 
   // Cumulative sum of the inverse mask
   rmm::device_uvector<int> index0(batch_size, stream);

cpp/src/tsne/distances.cuh

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: Copyright (c) 2019-2025, NVIDIA CORPORATION.
+ * SPDX-FileCopyrightText: Copyright (c) 2019-2026, NVIDIA CORPORATION.
  * SPDX-License-Identifier: Apache-2.0
  */
 
@@ -22,7 +22,6 @@
 #include <rmm/exec_policy.hpp>
 
 #include <cuda/functional>
-#include <thrust/functional.h>
 #include <thrust/transform_reduce.h>
 
 #include <cuvs/distance/distance.hpp>
@@ -144,7 +143,7 @@ void normalize_distances(value_t* distances, const size_t total_nn, cudaStream_t
                                              distances + total_nn,
                                              abs_f,
                                              0.0f,
-                                             thrust::maximum<value_t>());
+                                             cuda::maximum<value_t>());
   raft::linalg::scalarMultiply(distances, distances, 1.0f / maxNorm, total_nn, stream);
 }
 

cpp/src/tsne/fft_tsne.cuh

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: Copyright (c) 2021-2025, NVIDIA CORPORATION.
+ * SPDX-FileCopyrightText: Copyright (c) 2021-2026, NVIDIA CORPORATION.
  * SPDX-License-Identifier: Apache-2.0
  */
 
@@ -27,7 +27,6 @@
 #include <cuda/std/functional>
 #include <thrust/device_ptr.h>
 #include <thrust/fill.h>
-#include <thrust/functional.h>
 #include <thrust/reduce.h>
 #include <thrust/transform.h>
 

cpp/src_prims/timeSeries/stationarity.cuh

@@ -26,7 +26,6 @@
 #include <cuda/iterator>
 #include <thrust/device_ptr.h>
 #include <thrust/execution_policy.h>
-#include <thrust/functional.h>
 #include <thrust/iterator/counting_iterator.h>
 #include <thrust/scan.h>
 

cpp/tests/sg/rf_test.cu

@@ -27,7 +27,6 @@
 #include <thrust/device_vector.h>
 #include <thrust/execution_policy.h>
 #include <thrust/for_each.h>
-#include <thrust/functional.h>
 #include <thrust/host_vector.h>
 #include <thrust/iterator/counting_iterator.h>
 #include <thrust/logical.h>