fix running error for ipu (#41533)

cherry from #41481

paddle/phi/common/backend.h

@@ -55,6 +55,8 @@ enum class Backend : uint8_t {
   // paddle kernel primitives backend
   KPS,
 
+  IPU,
+
   // end of backend types
   NUM_BACKENDS,
 
@@ -121,6 +123,9 @@ inline std::ostream& operator<<(std::ostream& os, Backend backend) {
     case Backend::KPS:
       os << "KPS";
       break;
+    case Backend::IPU:
+      os << "IPU";
+      break;
     default: {
       size_t device_type_id_ = static_cast<size_t>(backend) -
                                static_cast<size_t>(Backend::NUM_BACKENDS);
@@ -155,6 +160,8 @@ inline Backend StringToBackend(const char* backend_cstr) {
     return Backend::GPUDNN;
   } else if (s == std::string("KPS")) {
     return Backend::KPS;
+  } else if (s == std::string("IPU")) {
+    return Backend::IPU;
   } else {
     return static_cast<Backend>(static_cast<size_t>(Backend::NUM_BACKENDS) +
                                 phi::GetOrRegisterGlobalDeviceTypeId(s));

paddle/phi/core/compat/convert_utils.cc

@@ -38,6 +38,8 @@ Backend TransToPhiBackend(const phi::Place& place) {
     return Backend::XPU;
   } else if (allocation_type == phi::AllocationType::NPU) {
     return Backend::NPU;
+  } else if (allocation_type == phi::AllocationType::IPU) {
+    return Backend::IPU;
   } else if (allocation_type == phi::AllocationType::CUSTOM) {
     return static_cast<Backend>(
         static_cast<size_t>(Backend::NUM_BACKENDS) +