fix test_pipeline, test=develop (#25808)

* fix test_pipeline, test=develop

paddle/fluid/framework/device_worker.h

@@ -335,6 +335,7 @@ class SectionWorker : public DeviceWorker {
   void SetSkipVars(const std::vector<std::string>& skip_vars) {
     skip_vars_ = skip_vars;
   }
+  static void ResetBatchId() { batch_id_ = 0; }
 
   static std::atomic<int> cpu_id_;
 

paddle/fluid/framework/pipeline_trainer.cc

@@ -250,6 +250,7 @@ void PipelineTrainer::Finalize() {
     }
   }
   root_scope_->DropKids();
+  SectionWorker::ResetBatchId();
 }
 
 Scope* PipelineTrainer::GetWorkerScope(int thread_id) {

python/paddle/fluid/tests/unittests/CMakeLists.txt

@@ -248,7 +248,6 @@ list(REMOVE_ITEM TEST_OPS test_fuse_bn_act_pass)
 list(REMOVE_ITEM TEST_OPS test_imperative_static_runner_mnist)
 list(REMOVE_ITEM TEST_OPS test_imperative_static_runner_while)
 list(REMOVE_ITEM TEST_OPS test_conv3d_transpose_op)
-list(REMOVE_ITEM TEST_OPS test_pipeline)
 
 # disable this unittest temporarily
 list(REMOVE_ITEM TEST_OPS test_imperative_data_loader_exception)