add demo.py for all kws models (#2107)

sugarcase

2024-09-25 8cd8e25f180b57c74f1ae7fd39001e5af4c20f8b

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repos:
  - repo: https://github.com/psf/black
    rev: 24.4.0
    hooks:
      - id: black
        args: ['--line-length=100']  # 示例参数，black默认使用4个空格缩进