为什么没有 data/ckpt/synthesizer 这个目录？

**Summary[问题简述（一句话）]**
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**Env & To Reproduce[复现与环境]**
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Start by checking the repository for the referenced data/ckpt/synthesizer path and read the setup or model-loading documentation that mentions checkpoints. Determine whether the directory is expected to be committed or created during setup; the issue is done when its absence is explained and the required setup or documentation change is identified.

Written by the indexing model from the issue text.