Revert "Optimize while_op when is_test is true. (#15811)" (#15968)

test=develop

paddle/fluid/framework/lod_rank_table.cc

@@ -19,10 +19,6 @@ namespace framework {
 void LoDRankTable::Reset(const LoD& lod, size_t level) {
   this->coarse_lod_.clear();
   this->items_.clear();
-  if (lod.size() == 0) {
-    // Reset to a empty rank table.
-    return;
-  }
   PADDLE_ENFORCE(level < lod.size(),
                  "Cannot rank lod since the level %d is less than lod size %d",
                  level, lod.size());

paddle/fluid/operators/controlflow/while_op.cc

@@ -58,7 +58,6 @@ class WhileOp : public framework::OperatorBase {
   void RunImpl(const framework::Scope &scope,
                const platform::Place &dev_place) const override {
     PADDLE_ENFORCE_NOT_NULL(scope.FindVar(Input(kCondition)));
-
     auto &cond = scope.FindVar(Input(kCondition))->Get<LoDTensor>();
     PADDLE_ENFORCE_EQ(cond.dims(), paddle::framework::make_ddim({1}));
 
@@ -78,33 +77,13 @@ class WhileOp : public framework::OperatorBase {
     VLOG(2) << GetSkipEagerDeletionVarsDebugString(skip_vars);
 
     auto ctx = executor.Prepare(*program, block->ID(), skip_vars);
-    if (!is_test) {
-      while (cond.data<bool>()[0]) {
-        auto &current_scope = scope.NewScope();
-        step_scopes->push_back(&current_scope);
-        executor.RunPreparedContext(ctx.get(), &current_scope, false, true,
-                                    true);
-      }
-    } else {
+    while (cond.data<bool>()[0]) {
       auto &current_scope = scope.NewScope();
-      executor.CreateVariables(*program, &current_scope, block->ID());
-      while (cond.data<bool>()[0]) {
-        for (auto &name : current_scope.LocalVarNames()) {
-          auto *var = current_scope.Var(name);
-          framework::LoD empty_lod;
-          if (var->IsType<framework::LoDTensor>()) {
-            // Clear all lod information for all lod_tensors.
-            auto *t = var->GetMutable<framework::LoDTensor>();
-            t->set_lod(empty_lod);
-          } else if (var->IsType<framework::LoDRankTable>()) {
-            auto *t = var->GetMutable<framework::LoDRankTable>();
-            t->Reset(empty_lod, 0);
-          }
-        }
-        executor.RunPreparedContext(ctx.get(), &current_scope, false, false,
-                                    false);
+      step_scopes->push_back(&current_scope);
+      executor.RunPreparedContext(ctx.get(), &current_scope, false, true, true);
+      if (is_test) {
+        scope.DeleteScope(&current_scope);
       }
-      scope.DeleteScope(&current_scope);
     }
   }
 };