[auto parallel] fix pp reshard (#59598)

FeixLiu · web-flow · commit 485edfde0b64 · 2023-12-04T11:47:40.000+08:00
diff --git a/paddle/phi/api/lib/tensor_utils.cc b/paddle/phi/api/lib/tensor_utils.cc
@@ -17,6 +17,7 @@ limitations under the License. */
 
 #include "paddle/phi/api/lib/api_registry.h"
 #include "paddle/phi/core/dense_tensor.h"
+#include "paddle/phi/core/distributed/auto_parallel/reshard/reshard_utils.h"
 
 #if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
 #ifdef PADDLE_WITH_CUDA
@@ -126,7 +127,10 @@ PADDLE_API std::shared_ptr<phi::distributed::DistTensor> reshard(
   if (input_tensor_impl) {
     phi::distributed::DistTensor* dist_tensor =
         static_cast<phi::distributed::DistTensor*>(input_tensor_impl.get());
-    if (dist_tensor->dist_attr() != dist_attr) {
+    if (dist_tensor->dist_attr() != dist_attr &&
+        (phi::distributed::IsCurRankInMesh(
+             dist_tensor->dist_attr().process_mesh()) ||
+         phi::distributed::IsCurRankInMesh(dist_attr.process_mesh()))) {
       VLOG(6) << "reshard func, reshard tensor from "
               << dist_tensor->dist_attr() << " to " << dist_attr;
       auto* func = phi::distributed::ChooseProperReshardFunction(*dist_tensor,
