Fix unused variables/parameters warnings (#1772)

CUDA 11.4 reports additional warnings. Fix cuGraph warnings in this PR (still, there are many warnings coming from RAFT).

Authors:
  - Seunghwa Kang (https://github.com/seunghwak)

Approvers:
  - Chuck Hastings (https://github.com/ChuckHastings)
  - Kumar Aatish (https://github.com/kaatish)

URL: #1772

cpp/src/centrality/betweenness_centrality.cu

@@ -66,7 +66,7 @@ void edge_betweenness_centrality_impl(raft::handle_t const& handle,
  weight_t const* weight,
  vertex_t number_of_sources,
  vertex_t const* sources,
- vertex_t total_number_of_sources)
+ vertex_t /* total_number_of_sources */)
 {
  // Current Implementation relies on BFS
  // FIXME: For SSSP version

cpp/src/community/legacy/egonet.cu

@@ -66,7 +66,6 @@ extract(raft::handle_t const& handle,
  vertex_t radius)
 {
  auto v = csr_view.get_number_of_vertices();
- auto e = csr_view.get_number_of_edges();
  auto user_stream_view = handle.get_stream_view();
  rmm::device_vector<size_t> neighbors_offsets(n_subgraphs + 1);
  rmm::device_vector<vertex_t> neighbors;

cpp/src/components/weakly_connected_components.cu

@@ -183,7 +183,7 @@ struct v_op_t {
 
  template <bool multi_gpu = GraphViewType::is_multi_gpu>
  __device__ std::enable_if_t<multi_gpu, thrust::optional<thrust::tuple<size_t, std::byte>>>
- operator()(thrust::tuple<vertex_type, vertex_type> tagged_v, int v_val /* dummy */) const
+ operator()(thrust::tuple<vertex_type, vertex_type> tagged_v, int /* v_val */) const
  {
  auto tag = thrust::get<1>(tagged_v);
  auto v_offset =
@@ -205,7 +205,7 @@ struct v_op_t {
 
  template <bool multi_gpu = GraphViewType::is_multi_gpu>
  __device__ std::enable_if_t<!multi_gpu, thrust::optional<thrust::tuple<size_t, std::byte>>>
- operator()(thrust::tuple<vertex_type, vertex_type> tagged_v, int v_val /* dummy */) const
+ operator()(thrust::tuple<vertex_type, vertex_type> /* tagged_v */, int /* v_val */) const
  {
  return thrust::optional<thrust::tuple<size_t, std::byte>>{
  thrust::make_tuple(next_bucket_idx, std::byte{0} /* dummy */)};
@@ -549,10 +549,8 @@ void weakly_connected_components_impl(raft::handle_t const& handle,
  col_first = level_graph_view.get_local_adj_matrix_partition_col_first(),
  edge_buffer_first =
  get_dataframe_buffer_begin<thrust::tuple<vertex_t, vertex_t>>(edge_buffer),
- num_edge_inserts = num_edge_inserts.data()] __device__(auto tagged_src,
- vertex_t dst,
- auto src_val,
- auto dst_val) {
+ num_edge_inserts =
+ num_edge_inserts.data()] __device__(auto tagged_src, vertex_t dst, auto, auto) {
  auto tag = thrust::get<1>(tagged_src);
  auto col_offset = dst - col_first;
  // FIXME: better switch to atomic_ref after

cpp/src/structure/graph.cu

@@ -68,8 +68,8 @@ compress_edgelist(edgelist_t<vertex_t, edge_t, weight_t> const& edgelist,
  vertex_t major_first,
  std::optional<vertex_t> major_hypersparse_first,
  vertex_t major_last,
- vertex_t minor_first,
- vertex_t minor_last,
+ vertex_t /* minor_first */,
+ vertex_t /* minor_last */,
  rmm::cuda_stream_view stream_view)
 {
  rmm::device_uvector<edge_t> offsets((major_last - major_first) + 1, stream_view);

cpp/src/structure/graph_view.cu

@@ -94,9 +94,7 @@ rmm::device_uvector<edge_t> compute_minor_degrees(
  graph_view,
  thrust::make_constant_iterator(0) /* dummy */,
  thrust::make_constant_iterator(0) /* dummy */,
- [] __device__(vertex_t src, vertex_t dst, weight_t w, auto src_val, auto dst_val) {
- return edge_t{1};
- },
+ [] __device__(vertex_t, vertex_t, weight_t, auto, auto) { return edge_t{1}; },
  edge_t{0},
  minor_degrees.data());
  } else {
@@ -105,9 +103,7 @@ rmm::device_uvector<edge_t> compute_minor_degrees(
  graph_view,
  thrust::make_constant_iterator(0) /* dummy */,
  thrust::make_constant_iterator(0) /* dummy */,
- [] __device__(vertex_t src, vertex_t dst, weight_t w, auto src_val, auto dst_val) {
- return edge_t{1};
- },
+ [] __device__(vertex_t, vertex_t, weight_t, auto, auto) { return edge_t{1}; },
  edge_t{0},
  minor_degrees.data());
  }
@@ -133,9 +129,7 @@ rmm::device_uvector<weight_t> compute_weight_sums(
  graph_view,
  thrust::make_constant_iterator(0) /* dummy */,
  thrust::make_constant_iterator(0) /* dummy */,
- [] __device__(vertex_t src, vertex_t dst, weight_t w, auto src_val, auto dst_val) {
- return w;
- },
+ [] __device__(vertex_t, vertex_t, weight_t w, auto, auto) { return w; },
  weight_t{0.0},
  weight_sums.data());
  } else {
@@ -144,9 +138,7 @@ rmm::device_uvector<weight_t> compute_weight_sums(
  graph_view,
  thrust::make_constant_iterator(0) /* dummy */,
  thrust::make_constant_iterator(0) /* dummy */,
- [] __device__(vertex_t src, vertex_t dst, weight_t w, auto src_val, auto dst_val) {
- return w;
- },
+ [] __device__(vertex_t, vertex_t, weight_t w, auto, auto) { return w; },
  weight_t{0.0},
  weight_sums.data());
  }