fix fetch handler error with pslib (#20679)

* fix fetch handler error with pslib
* fix distributed lookup table op with 1 pserver

python/paddle/fluid/executor.py

@@ -998,18 +998,6 @@ class Executor(object):
 
         if fetch_handler is not None:
             fetch_instance = fetch_handler
-        elif fetch_handler is None and fetch_list is not None:
-
-            class FH(FetchHandler):
-                def handler(self, fetch_target_vars):
-                    for i in range(len(fetch_target_vars)):
-                        print("{}: \n {}\n".format(fetch_info[i],
-                                                   fetch_target_vars[i]))
-
-            fetch_target_names = [var.name for var in fetch_list]
-            fetch_instance = FH(fetch_target_names,
-                                period_secs=print_period,
-                                return_np=False)
         else:
             fetch_instance = FetchHandler([])
 
@@ -1018,7 +1006,10 @@ class Executor(object):
             dataset=dataset,
             scope=scope,
             thread=thread,
-            debug=debug)
+            debug=debug,
+            fetch_list=fetch_list,
+            fetch_info=fetch_info,
+            print_period=print_period)
 
         trainer._set_infer(is_infer)
         trainer._gen_trainer_desc()

python/paddle/fluid/transpiler/distribute_transpiler.py

@@ -793,6 +793,8 @@ class DistributeTranspiler(object):
                 if self.sync_mode:
                     fetch_barrier_input.extend(splited_var)
 
+        self._update_remote_sparse_update_op(program, need_sparse_update_params)
+
         if self.sync_mode:
             # form a WAW dependency
             program.global_block().append_op(
@@ -806,11 +808,10 @@ class DistributeTranspiler(object):
                 })
 
         for param_varname, splited_var in six.iteritems(self.param_var_mapping):
-            if len(splited_var) <= 1:
-                continue
             orig_param = program.global_block().vars[param_varname]
             if param_varname not in self.sparse_param_to_height_sections:
-                if not self.config.runtime_split_send_recv:
+                if len(splited_var
+                       ) > 1 and not self.config.runtime_split_send_recv:
                     program.global_block().append_op(
                         type="concat",
                         inputs={"X": splited_var},
@@ -820,8 +821,6 @@ class DistributeTranspiler(object):
                             RPC_OP_ROLE_ATTR_NAME: DIST_OP_ROLE_ATTR_VALUE
                         })
 
-            self._update_remote_sparse_update_op(program,
-                                                 need_sparse_update_params)
         if not self.sync_mode:
             lr_ops = self._get_lr_ops()
             if len(lr_ops) > 0: