Add mdspan input API, fix cmakelists

cpp/include/raft/matrix/detail/sample_rows.cuh

@@ -16,21 +16,24 @@
 
 #pragma once
 
+#include <raft/core/device_mdarray.hpp>
+#include <raft/core/device_mdspan.hpp>
 #include <raft/core/logger.hpp>
+#include <raft/core/resources.hpp>
 #include <raft/matrix/gather.cuh>
 #include <raft/random/rng.cuh>
 #include <raft/util/cuda_utils.cuh>
 #include <raft/util/cudart_utils.hpp>
 
-namespace raft::matrix {
+namespace raft::matrix::detail {
 
 /** Select rows randomly from input and copy to output. */
 template <typename T, typename IdxT = int64_t>
 void sample_rows(raft::resources const& res,
                  const T* input,
                  IdxT n_rows_input,
                  raft::device_matrix_view<T, IdxT> output,
-                 RngState random_state)
+                 random::RngState random_state)
 {
   IdxT n_dim     = output.extent(1);
   IdxT n_samples = output.extent(0);
@@ -51,4 +54,4 @@ void sample_rows(raft::resources const& res,
     raft::matrix::detail::gather(res, dataset, make_const_mdspan(train_indices.view()), output);
   }
 }
-}  // namespace raft::matrix
+}  // namespace raft::matrix::detail

cpp/include/raft/matrix/sample_rows.cuh

@@ -16,36 +16,38 @@
 
 #pragma once
 
+#include <raft/core/device_mdarray.hpp>
+#include <raft/core/device_mdspan.hpp>
 #include <raft/core/logger.hpp>
-#include <raft/matrix/gather.cuh>
+#include <raft/core/resources.hpp>
+#include <raft/matrix/detail/sample_rows.cuh>
 #include <raft/random/rng.cuh>
-#include <raft/util/cuda_utils.cuh>
-#include <raft/util/cudart_utils.hpp>
 
 namespace raft::matrix {
 
 /** Select rows randomly from input and copy to output. */
-template <typename T, typename IdxT = int64_t>
+template <typename T, typename IdxT = int64_t, typename accessor>
 void sample_rows(raft::resources const& res,
-                 const T* input,
-                 IdxT n_rows_input,
-                 raft::device_matrix_view<T, IdxT> output,
-                 RngState random_state)
+                 random::RngState random_state,
+                 mdspan<const T, matrix_extent<int64_t>, row_major, accessor> dataset,
+                 raft::device_matrix_view<T, IdxT> output)
 {
   detail::sample_rows(res, input, n_rows_input, output, random_state);
+
+  detail::sample_rows(res, dataset.data_handle(), dataset.extent(0), output, random_state);
 }
 
 /** Subsample the dataset to create a training set*/
-template <typename T, typename IdxT = int64_t>
-raft::device_matrix<T, IdxT> sample_rows(raft::resources const& res,
-                                         const T* input,
-                                         IdxT n_rows_input,
-                                         IdxT n_train,
-                                         IdxT n_dim,
-                                         RngState random_state)
+template <typename T, typename IdxT = int64_t, typename accessor>
+raft::device_matrix<T, IdxT> sample_rows(
+  raft::resources const& res,
+  random::RngState random_state,
+  mdspan<const T, matrix_extent<int64_t>, row_major, accessor> dataset,
+  IdxT n_samples)
 {
-  auto output = raft::make_device_matrix<T, IdxT>(res, n_train, n_dim);
-  detail::sample_rows(res, input, n_rows_input, output, random_state);
+  auto output = raft::make_device_matrix<T, IdxT>(res, n_samples, dataset.extent(1));
+  detail::sample_rows(res, random_state, dataset.data_handle(), dataset.extent(0), output);
   return output;
 }
+
 }  // namespace raft::matrix