remove while_op support temporarily

test=develop

paddle/fluid/framework/executor.cc

@@ -419,7 +419,8 @@ void Executor::RunPreparedContext(ExecutorPrepareContext* ctx, Scope* scope,
 
   int64_t max_memory_size = GetEagerDeletionThreshold();
   std::unique_ptr<GarbageCollector> gc;
-  if (max_memory_size >= 0) {
+  // skip while_op and while_grad_op temporarily
+  if (max_memory_size >= 0 && !keep_kids) {
     ctx->ResetReferenceCount();
 #ifdef PADDLE_WITH_CUDA
     if (platform::is_gpu_place(place_)) {

paddle/fluid/operators/controlflow/while_op.cc

@@ -365,51 +365,7 @@ class WhileGradOpDescMaker : public framework::SingleGradOpDescMaker {
     // while operator could be renamed.
     while_grad->SetAttr("original_output_grad", output_grads_list);
 
-    /* The following codes are used in eager deletion mode */
-    std::unordered_set<std::string> bwd_skip_vars;
-    if (framework::GetEagerDeletionThreshold() >= 0) {
-      std::unordered_set<std::string> fwd_skip_vars;
-      for (auto *op_desc : grad_block->AllOps()) {
-        auto skippable = [&](const std::string &name) {
-          return !grad_block->HasVar(name) &&
-                 (fwd_block->HasVarRecursive(name) ||
-                  parent_block->HasVarRecursive(name));
-        };
-        for (auto &in_arg_name : op_desc->InputArgumentNames()) {
-          if (skippable(in_arg_name)) {
-            fwd_skip_vars.insert(in_arg_name);
-          }
-        }
-
-        for (auto &out_arg_name : op_desc->OutputArgumentNames()) {
-          if (skippable(out_arg_name)) {
-            fwd_skip_vars.insert(out_arg_name);
-          }
-        }
-      }
-
-      if (!fwd_skip_vars.empty()) {
-        // FIXME(zjl): ugly const_cast here, maybe we should find a better way
-        // to modify forward while_op
-        auto &fwd_while_op = const_cast<framework::OpDesc &>(ForwardOp());
-        fwd_while_op.SetAttr(kSkipEagerDeletionVars,
-                             std::vector<std::string>(fwd_skip_vars.begin(),
-                                                      fwd_skip_vars.end()));
-      }
-
-      // Find backward skip vars
-      auto fwd_input = Input(kX);
-      for (size_t i = 0; i < igs.size(); ++i) {
-        if (igs[i] == framework::kEmptyVarName) {
-          continue;
-        }
-        bwd_skip_vars.insert(igs[i]);
-        bwd_skip_vars.insert(framework::GradVarName(fwd_input[i]));
-      }
-    }
-    while_grad->SetAttr(
-        kSkipEagerDeletionVars,
-        std::vector<std::string>(bwd_skip_vars.begin(), bwd_skip_vars.end()));
+    while_grad->SetAttr(kSkipEagerDeletionVars, std::vector<std::string>());
 
     return std::unique_ptr<framework::OpDesc>(while_grad);
   }