| # Environment Variables |
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| `DiffSynth-Studio` can control some settings through environment variables. |
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| In `Python` code, you can set environment variables using `os.environ`. Please note that environment variables must be set before `import diffsynth`. |
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| ```python |
| import os |
| os.environ["DIFFSYNTH_MODEL_BASE_PATH"] = "./path_to_my_models" |
| import diffsynth |
| ``` |
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| On Linux operating systems, you can also temporarily set environment variables from the command line: |
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| ```shell |
| DIFFSYNTH_MODEL_BASE_PATH="./path_to_my_models" python xxx.py |
| ``` |
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| Below are the environment variables supported by `DiffSynth-Studio`. |
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| ## `DIFFSYNTH_SKIP_DOWNLOAD` |
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| Whether to skip model downloads. Can be set to `True`, `true`, `False`, `false`. If `skip_download` is not set in `ModelConfig`, this environment variable will determine whether to skip model downloads. |
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| ## `DIFFSYNTH_MODEL_BASE_PATH` |
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| Model download root directory. Can be set to any local path. If `local_model_path` is not set in `ModelConfig`, model files will be downloaded to the path pointed to by this environment variable. If neither is set, model files will be downloaded to `./models`. |
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| ## `DIFFSYNTH_ATTENTION_IMPLEMENTATION` |
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| Attention mechanism implementation method. Can be set to `flash_attention_3`, `flash_attention_2`, `sage_attention`, `xformers`, or `torch`. See [`./core/attention.md`](../API_Reference/core/attention.md) for details. |
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| ## `DIFFSYNTH_DISK_MAP_BUFFER_SIZE` |
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| Buffer size in disk mapping. Default is 1B (1000000000). Larger values occupy more memory but result in faster speeds. |
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| ## `DIFFSYNTH_DOWNLOAD_SOURCE` |
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| Remote model download source. Can be set to `modelscope` or `huggingface` to control the source of model downloads. Default value is `modelscope`. |
