fix shared-memory variable type

cpp/include/nvtext/minhash.hpp

@@ -124,7 +124,7 @@ namespace CUDF_EXPORT nvtext {
  * @throw std::overflow_error if `parameter_a.size() * input.size()` exceeds the column size limit
  *
  * @param input Strings column to compute minhash
- * @param seed  Seed value used for the hash algorithm
+ * @param seed Seed value used for the hash algorithm
  * @param parameter_a Values used for the permuted calculation
  * @param parameter_b Values used for the permuted calculation
  * @param width The character width of substrings to hash for each row
@@ -236,7 +236,7 @@ std::unique_ptr<cudf::column> minhash_permuted(
  * @throw std::overflow_error if `parameter_a.size() * input.size()` exceeds the column size limit
  *
  * @param input Strings column to compute minhash
- * @param seed  Seed value used for the hash algorithm
+ * @param seed Seed value used for the hash algorithm
  * @param parameter_a Values used for the permuted calculation
  * @param parameter_b Values used for the permuted calculation
  * @param width The character width of substrings to hash for each row

cpp/src/text/minhash.cu

@@ -353,8 +353,7 @@ CUDF_KERNEL void minhash_permuted_kernel(cudf::column_device_view const d_string
   constexpr hash_value_type hash_max = std::numeric_limits<hash_value_type>::max();
 
   // found to be an efficient shared memory size for both hash types
-  __shared__ char shmem[block_size * params_per_thread * sizeof(hash_value_type)];
-  auto const block_values = reinterpret_cast<hash_value_type*>(shmem);
+  __shared__ hash_value_type block_values[block_size * params_per_thread];
 
   for (std::size_t i = 0; i < parameter_a.size(); i += params_per_thread) {
     // initialize this block's chunk of shared memory