Environment

• Hardware Environment(Ascend/GPU/CPU):

Uncomment only one /device <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/device ascend

• Software Environment:
  -- MindSpore version (source or binary):
  -- Python version (e.g., Python 3.7.5):
  -- OS platform and distribution (e.g., Linux Ubuntu 16.04):
  -- GCC/Compiler version (if compiled from source):

Related testcase

Training with while in the network.

Steps to reproduce the issue

Describe the current behavior

while训练过程中，出现ERROR, It should be SymbolicKeyInstance.

Describe the expected behavior

Related log / screenshot

Special notes for this issue