Remove static checks for index size.

cpp/include/raft/neighbors/detail/cagra/cagra_serialize.cuh

@@ -31,19 +31,7 @@
 
 namespace raft::neighbors::cagra::detail {
 
-constexpr int serialization_version = 4;
-
-// NB: we wrap this check in a struct, so that the updated RealSize is easy to see in the error
-// message.
-template <size_t RealSize, size_t ExpectedSize>
-struct check_index_layout {
-  static_assert(RealSize == ExpectedSize,
-                "The size of the index struct has changed since the last update; "
-                "paste in the new size and consider updating the serialization logic");
-};
-
-constexpr size_t expected_size = 216;
-template struct check_index_layout<sizeof(index<double, std::uint64_t>), expected_size>;
+constexpr int serialization_version = 3;
 
 /**
  * Save the index to file.

cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh

@@ -34,18 +34,7 @@ namespace raft::neighbors::ivf_flat::detail {
 // backward compatibility.
 // TODO(hcho3) Implement next-gen serializer for IVF that allows for expansion in a backward
 //             compatible fashion.
-constexpr int serialization_version = 5;
-
-// NB: we wrap this check in a struct, so that the updated RealSize is easy to see in the error
-// message.
-template <size_t RealSize, size_t ExpectedSize>
-struct check_index_layout {
-  static_assert(RealSize == ExpectedSize,
-                "The size of the index struct has changed since the last update; "
-                "paste in the new size and consider updating the serialization logic");
-};
-
-template struct check_index_layout<sizeof(index<double, std::uint64_t>), 368>;
+constexpr int serialization_version = 4;
 
 /**
  * Save the index to file.

cpp/include/raft/neighbors/detail/ivf_pq_serialize.cuh

@@ -36,19 +36,7 @@ namespace raft::neighbors::ivf_pq::detail {
 // backward compatibility.
 // TODO(hcho3) Implement next-gen serializer for IVF that allows for expansion in a backward
 //             compatible fashion.
-constexpr int kSerializationVersion = 4;
-
-// NB: we wrap this check in a struct, so that the updated RealSize is easy to see in the error
-// message.
-template <size_t RealSize, size_t ExpectedSize>
-struct check_index_layout {
-  static_assert(RealSize == ExpectedSize,
-                "The size of the index struct has changed since the last update; "
-                "paste in the new size and consider updating the serialization logic");
-};
-
-// TODO: Recompute this and come back to it.
-template struct check_index_layout<sizeof(index<std::uint64_t>), 536>;
+constexpr int kSerializationVersion = 3;
 
 /**
  * Write the index to an output stream