deepspeech训练不收敛，训练函数不下降。

[lyhns]

If this is your first time, please read our contributor guidelines: https://github.com/mindspore-lab/mindcv/blob/main/CONTRIBUTING.md

Describe the bug/ 问题描述 (Mandatory / 必填) 训练8轮，损失函数不下降，一直在1300附近波动

• Hardware Environment(Ascend/GPU/CPU) / 硬件环境: 4张3090，cuda11.1，openmpi 4.1.4

  Please delete the backend not involved / 请删除不涉及的后端: /device ascend/GPU/CPU/kirin/等其他芯片

• Software Environment / 软件环境 (Mandatory / 必填): -- MindSpore version (e.g., 1.7.0.Bxxx) :202.14 -- Python version (e.g., Python 3.7.5) :3.8 -- OS platform and distribution (e.g., Linux Ubuntu 16.04):ubuntu 18.04 -- GCC/Compiler version (if compiled from source):

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

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

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

1. Go to '下载readme中的数据集，并flac转换成wav，使用100作为训练集，batch64，epoch70，lr0.0003和0.003都尝试过，4张3090'
2. Click on '....'
3. Scroll down to '....'
4. See error 训练8轮，损失不下降。

Expected behavior / 预期结果 (Mandatory / 必填)正常训练，损失正常下降 A clear and concise description of what you expected to happen.

Screenshots/ 日志 / 截图 (Mandatory / 必填) If applicable, add screenshots to help explain your problem.如上，损失8轮都不下降

Additional context / 备注 (Optional / 选填) Add any other context about the problem here. readme中错误很多

[PingqiLi]

感谢您的反馈，deepspeech2 GPU目前尚不支持。使用npu+minddspore1.9.0可以复现readme的推理精度结果。