[LJSpecch-1.1-fastspeech2] [Ascend910] [PYNATIVE] fastspeech2 failed to train on 1p

[787918582]

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Describe the bug/ 问题描述 (Mandatory / 必填)
#107 回归该问题单时，遇到新的训练报错

• Hardware Environment(Ascend/GPU/CPU) / 硬件环境:

Please delete the backend not involved / 请删除不涉及的后端:
/device ascend

• Software Environment / 软件环境 (Mandatory / 必填):
  -- MindSpore version (e.g., 1.7.0.Bxxx) :commit_id = ''[sha1]:cd68f09d,[branch]:(HEAD,origin/r1.9,r1.9)''
  -- Python version (e.g., Python 3.7.5) :3.7.5
  -- OS platform and distribution (e.g., Linux Ubuntu 16.04):EulerOS2.8
  -- GCC/Compiler version (if compiled from source):7.3.0

• Excute Mode / 执行模式 (Mandatory / 必填)(PyNative/Graph):

Please delete the mode not involved / 请删除不涉及的模式:
/mode pynative

To Reproduce / 重现步骤 (Mandatory / 必填)
Steps to reproduce the behavior:

1. 修改fastspeech2.yaml中的data_path、manifest_path、及lexicon_path路径
2. python train.py --config fastspeech2.yaml --device_target Ascend --is_distributed False --context_mode py

Expected behavior / 预期结果 (Mandatory / 必填)
可在Ascend910上正常跑通PYNATIVE模式单卡训练

Screenshots/ 日志 / 截图 (Mandatory / 必填)

Additional context / 备注 (Optional / 选填)