[kunlun] support allreduce sparse (#54172)

paddle/fluid/distributed/collective/reducer.cc

@@ -1097,6 +1097,15 @@ void EagerReducer::AllReduceSparse(EagerGroup *group,
     PADDLE_THROW(platform::errors::PermissionDenied(
         "Paddle can't concat grad tensors since it's not compiled with NCCL,"
         "Please recompile or reinstall Paddle with NCCL support."));
+#endif
+  } else if (platform::is_xpu_place(inner_place_)) {
+#ifdef PADDLE_WITH_XPU_BKCL
+    dev_ctx = static_cast<platform::XPUDeviceContext *>(
+        platform::DeviceContextPool::Instance().Get(inner_place_));
+#else
+    PADDLE_THROW(platform::errors::PermissionDenied(
+        "Paddle can't concat grad tensors since it's not compiled with XCCL,"
+        "Please recompile or reinstall Paddle with XCCL support."));
 #endif
   } else if (platform::is_custom_place(inner_place_)) {
 #ifdef PADDLE_WITH_CUSTOM_DEVICE