fix wt_sum warning

Author: tarang-jain

cpp/src/cluster/detail/kmeans.cuh

@@ -1011,8 +1011,7 @@ void kmeans_predict(raft::resources const& handle,
     raft::matrix::fill(handle, weight.view(), DataT(1));
 
   if (normalize_weight) {
-    DataT wt_sum = weightSum(handle, raft::make_const_mdspan(weight.view()));
-    RAFT_EXPECTS(wt_sum > DataT{0}, "invalid parameter (sum of sample weights must be positive)");
+    DataT wt_sum        = weightSum(handle, raft::make_const_mdspan(weight.view()));
     const DataT rel_tol = n_samples * std::numeric_limits<DataT>::epsilon();
     if (std::abs(wt_sum - n_samples) > rel_tol) {
       RAFT_LOG_DEBUG(

cpp/src/cluster/detail/kmeans_common.cuh

@@ -147,7 +147,6 @@ DataT weightSum(
   raft::mdspan<const DataT, raft::vector_extent<IndexT>, raft::layout_right, Accessor> weight)
 {
   auto n_samples = weight.extent(0);
-  auto ns        = static_cast<DataT>(n_samples);
 
   DataT wt_sum = DataT{0};
   if constexpr (raft::is_device_mdspan_v<decltype(weight)>) {
@@ -162,6 +161,7 @@ DataT weightSum(
       wt_sum += weight(i);
     }
   }
+  RAFT_EXPECTS(wt_sum > DataT{0}, "invalid parameter (sum of sample weights must be positive)");
   return wt_sum;
 }