removed duplicate imports (#161685)

Fixes #161684

Pull Request resolved: https://github.com/pytorch/pytorch/pull/161685
Approved by: https://github.com/Skylion007, https://github.com/ezyang

torch/fx/_graph_pickler.py

@@ -212,8 +212,6 @@ class _SymNodePickleData:
         self.hint = node._hint
 
     def _to_sym_node(self) -> SymNode:
-        from torch.fx.experimental.sym_node import SymNode
-
         assert self.shape_env is not None
         return SymNode(self.expr, self.shape_env, self.pytype, self.hint)
 

torch/profiler/profiler.py

@@ -527,7 +527,6 @@ def tensorboard_trace_handler(
     ``worker_name`` should be unique for each worker in distributed scenario,
     it will be set to '[hostname]_[pid]' by default.
     """
-    import os
     import socket
     import time