update error message when backend function is not available for specific dtype

Author: vtavana

dpnp/backend/extensions/blas/dot_common.hpp

@@ -128,7 +128,8 @@ std::pair<sycl::event, sycl::event>
     dot_impl_fn_ptr_t dot_fn = dot_dispatch_vector[type_id];
     if (dot_fn == nullptr) {
         throw py::value_error(
-            "Types of input vectors and result array are mismatched.");
+            "No dot implementation is available for the specified data type "
+            "of the input and output arrays.");
     }
 
     char *x_typeless_ptr = vectorX.get_data();

dpnp/backend/extensions/blas/gemm.cpp

@@ -315,7 +315,8 @@ std::tuple<sycl::event, sycl::event, bool>
         gemm_dispatch_table[matrixAB_type_id][resultC_type_id];
     if (gemm_fn == nullptr) {
         throw py::value_error(
-            "Types of input matrices and result matrix are mismatched.");
+            "No gemm implementation is available for the specified data type "
+            "of the input and output arrays.");
     }
 
     const char *a_typeless_ptr = matrixA.get_data();

dpnp/backend/extensions/blas/gemm_batch.cpp

@@ -389,7 +389,8 @@ std::tuple<sycl::event, sycl::event, bool>
         gemm_batch_dispatch_table[matrixAB_type_id][resultC_type_id];
     if (gemm_batch_fn == nullptr) {
         throw py::value_error(
-            "Types of input matrices and result matrix are mismatched.");
+            "No gemm_batch implementation is available for the specified data "
+            "type of the input and output arrays.");
     }
 
     const char *a_typeless_ptr = matrixA.get_data();

dpnp/backend/extensions/blas/gemv.cpp

@@ -282,7 +282,8 @@ std::pair<sycl::event, sycl::event>
     gemv_impl_fn_ptr_t gemv_fn = gemv_dispatch_vector[type_id];
     if (gemv_fn == nullptr) {
         throw py::value_error(
-            "Types of input arrays and result array are mismatched.");
+            "No gemv implementation is available for the specified data type "
+            "of the input and output arrays.");
     }
 
     const char *a_typeless_ptr = matrixA.get_data();

dpnp/backend/extensions/blas/syrk.cpp

@@ -262,7 +262,8 @@ std::pair<sycl::event, sycl::event>
     syrk_impl_fn_ptr_t syrk_fn = syrk_dispatch_vector[type_id];
     if (syrk_fn == nullptr) {
         throw py::value_error(
-            "Types of input arrays and result array are mismatched.");
+            "No syrk implementation is available for the specified data type "
+            "of the input and output arrays.");
     }
 
     const char *a_typeless_ptr = matrixA.get_data();

dpnp/backend/extensions/lapack/evd_batch_common.hpp

@@ -97,7 +97,8 @@ std::pair<sycl::event, sycl::event>
         evd_batch_dispatch_table[eig_vecs_type_id][eig_vals_type_id];
     if (evd_batch_fn == nullptr) {
         throw py::value_error(
-            "Types of input vectors and result array are mismatched.");
+            "No evd_batch implementation is available for the specified data "
+            "type of the input and output arrays.");
     }
 
     char *eig_vecs_data = eig_vecs.get_data();

dpnp/backend/extensions/lapack/evd_common.hpp

@@ -91,7 +91,8 @@ std::pair<sycl::event, sycl::event>
         evd_dispatch_table[eig_vecs_type_id][eig_vals_type_id];
     if (evd_fn == nullptr) {
         throw py::value_error(
-            "Types of input vectors and result array are mismatched.");
+            "No evd implementation is available for the specified data type "
+            "of the input and output arrays.");
     }
 
     char *eig_vecs_data = eig_vecs.get_data();