Fix compiler error.

Author: breyerml

include/plssvm/svm/csvm.hpp

@@ -22,7 +22,6 @@
 #include "plssvm/detail/memory_size.hpp"                   // plssvm::detail::memory_size
 #include "plssvm/detail/move_only_any.hpp"                 // plssvm::detail::move_only_any
 #include "plssvm/detail/ssize.hpp"                         // plssvm::detail::ssize_t
-#include "plssvm/detail/ssize.hpp"                         // plssvm::detail::ssize_t
 #include "plssvm/detail/tracking/performance_tracker.hpp"  // PLSSVM_DETAIL_TRACKING_PERFORMANCE_TRACKER_ADD_TRACKING_ENTRY, PLSSVM_DETAIL_TRACKING_PERFORMANCE_TRACKER_ADD_EVENT, plssvm::detail::tracking::tracking_entry
 #include "plssvm/detail/type_traits.hpp"                   // PLSSVM_REQUIRES, plssvm::detail::remove_cvref_t
 #include "plssvm/exceptions/exceptions.hpp"                // plssvm::invalid_parameter_exception
@@ -466,7 +465,7 @@ std::tuple<aos_matrix<real_type>, std::vector<real_type>, std::vector<unsigned l
     std::vector<real_type> b_back_value(num_rhs);
     soa_matrix<real_type> B_red{ shape{ num_rhs, num_rows_reduced } };
 #pragma omp parallel for default(none) shared(B, B_red, b_back_value) firstprivate(num_rhs, num_rows_reduced)
-    for (ssize_t row = 0; row < static_cast<ssize_t>(num_rhs); ++row) {
+    for (detail::ssize_t row = 0; row < static_cast<detail::ssize_t>(num_rhs); ++row) {
         b_back_value[row] = B(row, num_rows_reduced);
         for (std::size_t col = 0; col < num_rows_reduced; ++col) {
             B_red(row, col) = B(row, col) - b_back_value[row];
@@ -495,11 +494,11 @@ std::tuple<aos_matrix<real_type>, std::vector<real_type>, std::vector<unsigned l
     aos_matrix<real_type> X_ret{ shape{ num_rhs, A.num_rows() }, shape{ PADDING_SIZE, PADDING_SIZE } };
     std::vector<real_type> bias(num_rhs);
 #pragma omp parallel for default(none) shared(X, q_red, X_ret, bias, b_back_value) firstprivate(num_rhs, num_rows_reduced, QA_cost)
-    for (ssize_t i = 0; i < static_cast<ssize_t>(num_rhs); ++i) {
+    for (detail::ssize_t i = 0; i < static_cast<detail::ssize_t>(num_rhs); ++i) {
         real_type temp_sum{ 0.0 };
         real_type temp_dot{ 0.0 };
 #pragma omp simd reduction(+ : temp_sum) reduction(+ : temp_dot)
-        for (ssize_t dim = 0; dim < static_cast<ssize_t>(num_rows_reduced); ++dim) {
+        for (detail::ssize_t dim = 0; dim < static_cast<detail::ssize_t>(num_rows_reduced); ++dim) {
             temp_sum += X(i, dim);
             temp_dot += q_red[dim] * X(i, dim);