remove useless code (#54657)

python/paddle/distributed/passes/pipeline_scheduler_pass.py

@@ -282,20 +282,6 @@ class PipelineFThenBPass(PassBase):
             backward_job.set_micro_batch_id(i)
             job_list.append(backward_job)
 
-        opt_job = core.job("optimizer")
-        job_list = []
-        lr_job = core.job("lr")
-        job_list.append(lr_job)
-        for i in range(self._micro_batch_size):
-            forward_job = core.job("forward")
-            forward_job.set_micro_batch_id(i)
-            job_list.append(forward_job)
-
-        for i in range(self._micro_batch_size):
-            backward_job = core.job("backward")
-            backward_job.set_micro_batch_id(i)
-            job_list.append(backward_job)
-
         opt_job = core.job("optimizer")
         job_list.append(opt_job)
         return job_list