Update for CCCL 2.x

cpp/include/cugraph/utilities/misc_utils.cuh

@@ -26,6 +26,8 @@
 #include <thrust/iterator/transform_iterator.h>
 #include <thrust/optional.h>
 
+#include <cuda/functional>
+
 #include <optional>
 #include <tuple>
 #include <vector>
@@ -44,7 +46,8 @@ std::tuple<std::vector<vertex_t>, std::vector<edge_t>> compute_offset_aligned_ed
 {
   auto search_offset_first = thrust::make_transform_iterator(
     thrust::make_counting_iterator(size_t{1}),
-    [approx_edge_chunk_size] __device__(auto i) { return i * approx_edge_chunk_size; });
+    cuda::proclaim_return_type<size_t>(
+      [approx_edge_chunk_size] __device__(auto i) { return i * approx_edge_chunk_size; }));
   auto num_chunks = (num_edges + approx_edge_chunk_size - 1) / approx_edge_chunk_size;
 
   if (num_chunks > 1) {

cpp/include/cugraph/utilities/shuffle_comm.cuh

@@ -40,6 +40,8 @@
 #include <thrust/tabulate.h>
 #include <thrust/tuple.h>
 
+#include <cuda/functional>
+
 #include <algorithm>
 #include <numeric>
 #include <vector>
@@ -197,12 +199,13 @@ void multi_partition(ValueIterator value_first,
     value_last,
     thrust::make_zip_iterator(
       thrust::make_tuple(group_ids.begin(), intra_partition_offsets.begin())),
-    [value_to_group_id_op, group_first, counts = counts.data()] __device__(auto value) {
-      auto group_id = value_to_group_id_op(value);
-      cuda::std::atomic_ref<size_t> counter(counts[group_id - group_first]);
-      return thrust::make_tuple(group_id,
-                                counter.fetch_add(size_t{1}, cuda::std::memory_order_relaxed));
-    });
+    cuda::proclaim_return_type<thrust::tuple<int, size_t>>(
+      [value_to_group_id_op, group_first, counts = counts.data()] __device__(auto value) {
+        auto group_id = value_to_group_id_op(value);
+        cuda::std::atomic_ref<size_t> counter(counts[group_id - group_first]);
+        return thrust::make_tuple(group_id,
+                                  counter.fetch_add(size_t{1}, cuda::std::memory_order_relaxed));
+      }));
 
   rmm::device_uvector<size_t> displacements(num_groups, stream_view);
   thrust::exclusive_scan(
@@ -245,17 +248,19 @@ void multi_partition(KeyIterator key_first,
   rmm::device_uvector<int> group_ids(num_keys, stream_view);
   rmm::device_uvector<size_t> intra_partition_offsets(num_keys, stream_view);
   thrust::fill(rmm::exec_policy(stream_view), counts.begin(), counts.end(), size_t{0});
-  thrust::transform(rmm::exec_policy(stream_view),
-                    key_first,
-                    key_last,
-                    thrust::make_zip_iterator(
-                      thrust::make_tuple(group_ids.begin(), intra_partition_offsets.begin())),
-                    [key_to_group_id_op, group_first, counts = counts.data()] __device__(auto key) {
-                      auto group_id = key_to_group_id_op(key);
-                      cuda::std::atomic_ref<size_t> counter(counts[group_id - group_first]);
-                      return thrust::make_tuple(
-                        group_id, counter.fetch_add(size_t{1}, cuda::std::memory_order_relaxed));
-                    });
+  thrust::transform(
+    rmm::exec_policy(stream_view),
+    key_first,
+    key_last,
+    thrust::make_zip_iterator(
+      thrust::make_tuple(group_ids.begin(), intra_partition_offsets.begin())),
+    cuda::proclaim_return_type<thrust::tuple<int, size_t>>(
+      [key_to_group_id_op, group_first, counts = counts.data()] __device__(auto key) {
+        auto group_id = key_to_group_id_op(key);
+        cuda::std::atomic_ref<size_t> counter(counts[group_id - group_first]);
+        return thrust::make_tuple(group_id,
+                                  counter.fetch_add(size_t{1}, cuda::std::memory_order_relaxed));
+      }));
 
   rmm::device_uvector<size_t> displacements(num_groups, stream_view);
   thrust::exclusive_scan(
@@ -761,8 +766,9 @@ rmm::device_uvector<size_t> groupby_and_count(ValueIterator tx_value_first /* [I
                              stream_view);
 
   auto group_id_first = thrust::make_transform_iterator(
-    tx_value_first,
-    [value_to_group_id_op] __device__(auto value) { return value_to_group_id_op(value); });
+    tx_value_first, cuda::proclaim_return_type<int>([value_to_group_id_op] __device__(auto value) {
+      return value_to_group_id_op(value);
+    }));
   rmm::device_uvector<int> d_tx_dst_ranks(num_groups, stream_view);
   rmm::device_uvector<size_t> d_tx_value_counts(d_tx_dst_ranks.size(), stream_view);
   auto rank_count_pair_first = thrust::make_zip_iterator(
@@ -795,7 +801,9 @@ rmm::device_uvector<size_t> groupby_and_count(VertexIterator tx_key_first /* [IN
                              stream_view);
 
   auto group_id_first = thrust::make_transform_iterator(
-    tx_key_first, [key_to_group_id_op] __device__(auto key) { return key_to_group_id_op(key); });
+    tx_key_first, cuda::proclaim_return_type<int>([key_to_group_id_op] __device__(auto key) {
+      return key_to_group_id_op(key);
+    }));
   rmm::device_uvector<int> d_tx_dst_ranks(num_groups, stream_view);
   rmm::device_uvector<size_t> d_tx_value_counts(d_tx_dst_ranks.size(), stream_view);
   auto rank_count_pair_first = thrust::make_zip_iterator(

cpp/src/community/detail/mis_impl.cuh

@@ -37,6 +37,8 @@
 #include <thrust/transform.h>
 #include <thrust/transform_reduce.h>
 
+#include <cuda/functional>
+
 #include <cmath>
 
 namespace cugraph {
@@ -78,13 +80,13 @@ rmm::device_uvector<vertex_t> maximal_independent_set(
   thrust::copy(handle.get_thrust_policy(), vertex_begin, vertex_end, ranks.begin());
 
   // Set ranks of zero out-degree vetices to std::numeric_limits<vertex_t>::lowest()
-  thrust::transform_if(
-    handle.get_thrust_policy(),
-    out_degrees.begin(),
-    out_degrees.end(),
-    ranks.begin(),
-    [] __device__(auto) { return std::numeric_limits<vertex_t>::lowest(); },
-    [] __device__(auto deg) { return deg == 0; });
+  thrust::transform_if(handle.get_thrust_policy(),
+                       out_degrees.begin(),
+                       out_degrees.end(),
+                       ranks.begin(),
+                       cuda::proclaim_return_type<vertex_t>(
+                         [] __device__(auto) { return std::numeric_limits<vertex_t>::lowest(); }),
+                       [] __device__(auto deg) { return deg == 0; });
 
   out_degrees.resize(0, handle.get_stream());
   out_degrees.shrink_to_fit(handle.get_stream());

cpp/src/community/detail/refine_impl.cuh

@@ -46,6 +46,8 @@
 #include <thrust/transform_reduce.h>
 #include <thrust/tuple.h>
 
+#include <cuda/functional>
+
 CUCO_DECLARE_BITWISE_COMPARABLE(float)
 CUCO_DECLARE_BITWISE_COMPARABLE(double)
 // FIXME: a temporary workaround for a compiler error, should be deleted once cuco gets patched.
@@ -213,16 +215,17 @@ refine_clustering(
                                 : detail::edge_minor_property_view_t<vertex_t, vertex_t const*>(
                                     louvain_assignment_of_vertices.data(), vertex_t{0}),
     *edge_weight_view,
-    [] __device__(auto src, auto dst, auto src_cluster, auto dst_cluster, auto wt) {
-      weight_t weighted_cut_contribution{0};
+    cuda::proclaim_return_type<weight_t>(
+      [] __device__(auto src, auto dst, auto src_cluster, auto dst_cluster, auto wt) {
+        weight_t weighted_cut_contribution{0};
 
-      if (src == dst)  // self loop
-        weighted_cut_contribution = 0;
-      else if (src_cluster == dst_cluster)
-        weighted_cut_contribution = wt;
+        if (src == dst)  // self loop
+          weighted_cut_contribution = 0;
+        else if (src_cluster == dst_cluster)
+          weighted_cut_contribution = wt;
 
-      return weighted_cut_contribution;
-    },
+        return weighted_cut_contribution;
+      }),
     weight_t{0},
     cugraph::reduce_op::plus<weight_t>{},
     weighted_cut_of_vertices_to_louvain.begin());
@@ -243,13 +246,14 @@ refine_clustering(
                     wcut_deg_and_cluster_vol_triple_begin,
                     wcut_deg_and_cluster_vol_triple_end,
                     singleton_and_connected_flags.begin(),
-                    [resolution, total_edge_weight] __device__(auto wcut_wdeg_and_louvain_volume) {
+                    cuda::proclaim_return_type<uint8_t>([resolution, total_edge_weight] __device__(
+                                                          auto wcut_wdeg_and_louvain_volume) {
                       auto wcut           = thrust::get<0>(wcut_wdeg_and_louvain_volume);
                       auto wdeg           = thrust::get<1>(wcut_wdeg_and_louvain_volume);
                       auto louvain_volume = thrust::get<2>(wcut_wdeg_and_louvain_volume);
-                      return wcut >
-                             (resolution * wdeg * (louvain_volume - wdeg) / total_edge_weight);
-                    });
+                      return static_cast<uint8_t>(
+                        wcut > (resolution * wdeg * (louvain_volume - wdeg) / total_edge_weight));
+                    }));
 
   edge_src_property_t<GraphViewType, weight_t> src_louvain_cluster_weight_cache(handle);
   edge_src_property_t<GraphViewType, weight_t> src_cut_to_louvain_cache(handle);
@@ -718,11 +722,12 @@ refine_clustering(
       vertices_in_mis.begin(),
       vertices_in_mis.end(),
       dst_vertices.begin(),
-      [dst_first = thrust::get<1>(gain_and_dst_first.get_iterator_tuple()),
-       v_first   = graph_view.local_vertex_partition_range_first()] __device__(vertex_t v) {
-        auto dst = *(dst_first + v - v_first);
-        return dst;
-      });
+      cuda::proclaim_return_type<vertex_t>(
+        [dst_first = thrust::get<1>(gain_and_dst_first.get_iterator_tuple()),
+         v_first   = graph_view.local_vertex_partition_range_first()] __device__(vertex_t v) {
+          auto dst = *(dst_first + v - v_first);
+          return dst;
+        }));
 
     cugraph::resize_dataframe_buffer(gain_and_dst_output_pairs, 0, handle.get_stream());
     cugraph::shrink_to_fit_dataframe_buffer(gain_and_dst_output_pairs, handle.get_stream());

cpp/src/detail/collect_local_vertex_values.cu

@@ -19,6 +19,8 @@
 #include <cugraph/graph_functions.hpp>
 #include <cugraph/utilities/shuffle_comm.cuh>
 
+#include <cuda/functional>
+
 namespace cugraph {
 namespace detail {
 
@@ -64,7 +66,8 @@ rmm::device_uvector<value_t> collect_local_vertex_values_from_ext_vertex_value_p
 
   auto vertex_iterator = thrust::make_transform_iterator(
     d_vertices.begin(),
-    [local_vertex_first] __device__(vertex_t v) { return v - local_vertex_first; });
+    cuda::proclaim_return_type<vertex_t>(
+      [local_vertex_first] __device__(vertex_t v) { return v - local_vertex_first; }));
 
   d_local_values.resize(local_vertex_last - local_vertex_first, handle.get_stream());
   thrust::fill(

cpp/src/generators/erdos_renyi_generator.cu

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2022, NVIDIA CORPORATION.
+ * Copyright (c) 2021-2023, NVIDIA CORPORATION.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,6 +28,8 @@
 #include <thrust/transform.h>
 #include <thrust/tuple.h>
 
+#include <cuda/functional>
+
 namespace cugraph {
 
 template <typename vertex_t>
@@ -42,12 +44,13 @@ generate_erdos_renyi_graph_edgelist_gnp(raft::handle_t const& handle,
                   "Implementation cannot support specified value");
 
   auto random_iterator = thrust::make_transform_iterator(
-    thrust::make_counting_iterator<size_t>(0), [seed] __device__(size_t index) {
+    thrust::make_counting_iterator<size_t>(0),
+    cuda::proclaim_return_type<float>([seed] __device__(size_t index) {
       thrust::default_random_engine rng(seed);
       thrust::uniform_real_distribution<float> dist(0.0, 1.0);
       rng.discard(index);
       return dist(rng);
-    });
+    }));
 
   size_t count = thrust::count_if(handle.get_thrust_policy(),
                                   random_iterator,
@@ -69,13 +72,14 @@ generate_erdos_renyi_graph_edgelist_gnp(raft::handle_t const& handle,
                     indices_v.begin(),
                     indices_v.end(),
                     thrust::make_zip_iterator(thrust::make_tuple(src_v.begin(), src_v.end())),
-                    [num_vertices] __device__(size_t index) {
-                      size_t src = index / num_vertices;
-                      size_t dst = index % num_vertices;
-
-                      return thrust::make_tuple(static_cast<vertex_t>(src),
-                                                static_cast<vertex_t>(dst));
-                    });
+                    cuda::proclaim_return_type<thrust::tuple<vertex_t, vertex_t>>(
+                      [num_vertices] __device__(size_t index) {
+                        size_t src = index / num_vertices;
+                        size_t dst = index % num_vertices;
+
+                        return thrust::make_tuple(static_cast<vertex_t>(src),
+                                                  static_cast<vertex_t>(dst));
+                      }));
 
   handle.sync_stream();
 

cpp/src/generators/simple_generators.cu

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2022, NVIDIA CORPORATION.
+ * Copyright (c) 2021-2023, NVIDIA CORPORATION.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,8 @@
 #include <thrust/sequence.h>
 #include <thrust/tuple.h>
 
+#include <cuda/functional>
+
 #include <numeric>
 
 namespace cugraph {
@@ -264,23 +266,24 @@ generate_complete_graph_edgelist(
 
     auto transform_iter = thrust::make_transform_iterator(
       thrust::make_counting_iterator<size_t>(0),
-      [base_vertex_id, num_vertices, invalid_vertex] __device__(size_t index) {
-        size_t graph_index = index / (num_vertices * num_vertices);
-        size_t local_index = index % (num_vertices * num_vertices);
-
-        vertex_t src = base_vertex_id + static_cast<vertex_t>(local_index / num_vertices);
-        vertex_t dst = base_vertex_id + static_cast<vertex_t>(local_index % num_vertices);
-
-        if (src == dst) {
-          src = invalid_vertex;
-          dst = invalid_vertex;
-        } else {
-          src += (graph_index * num_vertices);
-          dst += (graph_index * num_vertices);
-        }
-
-        return thrust::make_tuple(src, dst);
-      });
+      cuda::proclaim_return_type<thrust::tuple<vertex_t, vertex_t>>(
+        [base_vertex_id, num_vertices, invalid_vertex] __device__(size_t index) {
+          size_t graph_index = index / (num_vertices * num_vertices);
+          size_t local_index = index % (num_vertices * num_vertices);
+
+          vertex_t src = base_vertex_id + static_cast<vertex_t>(local_index / num_vertices);
+          vertex_t dst = base_vertex_id + static_cast<vertex_t>(local_index % num_vertices);
+
+          if (src == dst) {
+            src = invalid_vertex;
+            dst = invalid_vertex;
+          } else {
+            src += (graph_index * num_vertices);
+            dst += (graph_index * num_vertices);
+          }
+
+          return thrust::make_tuple(src, dst);
+        }));
 
     output_iterator = thrust::copy_if(handle.get_thrust_policy(),
                                       transform_iter,

cpp/src/mtmg/vertex_result.cu

@@ -21,6 +21,7 @@
 
 #include <detail/graph_partition_utils.cuh>
 
+#include <thrust/functional.h>
 #include <thrust/gather.h>
 
 namespace cugraph {
@@ -91,10 +92,11 @@ rmm::device_uvector<result_t> vertex_result_view_t<result_t>::gather(
   auto vertex_partition =
     vertex_partition_device_view_t<vertex_t, multi_gpu>(vertex_partition_view);
 
-  auto iter =
-    thrust::make_transform_iterator(local_vertices.begin(), [vertex_partition] __device__(auto v) {
+  auto iter = thrust::make_transform_iterator(
+    local_vertices.begin(),
+    cuda::proclaim_return_type<vertex_t>([vertex_partition] __device__(auto v) {
       return vertex_partition.local_vertex_partition_offset_from_vertex_nocheck(v);
-    });
+    }));
 
   thrust::gather(handle.get_thrust_policy(),
                  iter,
@@ -111,7 +113,7 @@ rmm::device_uvector<result_t> vertex_result_view_t<result_t>::gather(
       vertex_gpu_ids.begin(),
       vertex_gpu_ids.end(),
       thrust::make_zip_iterator(local_vertices.begin(), vertex_pos.begin(), tmp_result.begin()),
-      [] __device__(int gpu) { return gpu; },
+      thrust::identity{},
       handle.get_stream());
 
   //

cpp/src/prims/per_v_random_select_transform_outgoing_e.cuh

@@ -44,6 +44,8 @@
 #include <thrust/tuple.h>
 #include <thrust/unique.h>
 
+#include <cuda/functional>
+
 #include <optional>
 #include <tuple>
 
@@ -596,8 +598,9 @@ rmm::device_uvector<edge_t> get_sampling_index_without_replacement(
                                         multiplier_t<size_t>{high_partition_over_sampling_K}),
         thrust::make_transform_iterator(
           thrust::make_counting_iterator(size_t{0}),
-          [high_partition_over_sampling_K, unique_counts = unique_counts.data()] __device__(
-            size_t i) { return i * high_partition_over_sampling_K + unique_counts[i]; }),
+          cuda::proclaim_return_type<size_t>(
+            [high_partition_over_sampling_K, unique_counts = unique_counts.data()] __device__(
+              size_t i) { return i * high_partition_over_sampling_K + unique_counts[i]; })),
         handle.get_stream());
       if (tmp_storage_bytes > d_tmp_storage.size()) {
         d_tmp_storage = rmm::device_uvector<std::byte>(tmp_storage_bytes, handle.get_stream());
@@ -615,8 +618,9 @@ rmm::device_uvector<edge_t> get_sampling_index_without_replacement(
                                         multiplier_t<size_t>{high_partition_over_sampling_K}),
         thrust::make_transform_iterator(
           thrust::make_counting_iterator(size_t{0}),
-          [high_partition_over_sampling_K, unique_counts = unique_counts.data()] __device__(
-            size_t i) { return i * high_partition_over_sampling_K + unique_counts[i]; }),
+          cuda::proclaim_return_type<size_t>(
+            [high_partition_over_sampling_K, unique_counts = unique_counts.data()] __device__(
+              size_t i) { return i * high_partition_over_sampling_K + unique_counts[i]; })),
         handle.get_stream());
 
       // copy the neighbor indices back to sample_nbr_indices