[fix] When result of importing horovod is None, TFRA DEHvdCheckpoint …

…would not call DE variable saving and sweeping redundant DE files.

tensorflow_recommenders_addons/dynamic_embedding/python/train/checkpoint.py

@@ -178,8 +178,20 @@ def _get_de_dir_from_file_path(file_path):
       de_dir = self._get_de_variable_folder_dir(file_path, global_step)
       return file_prefix_pattern, global_step, de_dir
 
+    def _rank0_delete_files_and_return_de_dir(file_path):
+      file_prefix_pattern, global_step, de_dir = _get_de_dir_from_file_path(
+          file_path)
+      if global_step is not None:
+        ckpt_index_list = file_io.get_matching_files(file_prefix_pattern +
+                                                     '-*.index')
+        self._delete_redundant_de_dir(
+            ckpt_index_list
+        )  # Compatible with automatic sweep function of checkpointmanager
+      return de_dir
+
     if self._hvd is None:
       file_path = tf_write_func()
+      de_dir = _rank0_delete_files_and_return_de_dir(file_path)
       self._de_handle_root_and_var_with_func(de_dir=de_dir,
                                              func=self._de_var_fs_save_funtion)
     else:
@@ -189,14 +201,7 @@ def _get_de_dir_from_file_path(file_path):
         self._hvd.broadcast_object(file_path,
                                    root_rank=0,
                                    name='de_hvd_broadcast_file_path')
-        file_prefix_pattern, global_step, de_dir = _get_de_dir_from_file_path(
-            file_path)
-        if global_step is not None:
-          ckpt_index_list = file_io.get_matching_files(file_prefix_pattern +
-                                                       '-*.index')
-          self._delete_redundant_de_dir(
-              ckpt_index_list
-          )  # Compatible with automatic sweep function of checkpointmanager
+        de_dir = _rank0_delete_files_and_return_de_dir(file_path)
         self._hvd.join()  # Sync for avoiding files conflict
         self._de_handle_root_and_var_with_func(
             de_dir=de_dir, func=self._de_var_fs_save_funtion)
@@ -205,8 +210,7 @@ def _get_de_dir_from_file_path(file_path):
       else:
         file_path = self._hvd.broadcast_object(
             None, root_rank=0, name='de_hvd_broadcast_file_path')
-        file_prefix_pattern, global_step, de_dir = _get_de_dir_from_file_path(
-            file_path)
+        _, _, de_dir = _get_de_dir_from_file_path(file_path)
         self._hvd.join()  # Sync for avoiding files conflict
         self._de_handle_root_and_var_with_func(
             de_dir=de_dir, func=self._de_var_fs_save_funtion)