38 lines
1.5 KiB
Python
38 lines
1.5 KiB
Python
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from typing import Any
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from vllm_omni.diffusion.cache.base import CacheBackend
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from vllm_omni.diffusion.cache.cache_dit_backend import CacheDiTBackend
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from vllm_omni.diffusion.cache.teacache.backend import TeaCacheBackend
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from vllm_omni.diffusion.data import DiffusionCacheConfig
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def get_cache_backend(cache_backend: str | None, cache_config: Any) -> CacheBackend | None:
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"""Get cache backend instance based on cache_backend string.
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This is a selector function that routes to the appropriate backend implementation.
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- cache_dit: Uses CacheDiTBackend with enable()/refresh() interface
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- tea_cache: Uses TeaCacheBackend with enable()/refresh() interface
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Args:
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cache_backend: Cache backend name ("cache_dit", "tea_cache", or None).
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cache_config: Cache configuration (dict or DiffusionCacheConfig instance).
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Returns:
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Cache backend instance (CacheDiTBackend or TeaCacheBackend) if cache_backend is set,
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None otherwise.
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Raises:
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ValueError: If cache_backend is unsupported.
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"""
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if cache_backend is None or cache_backend == "none":
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return None
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if isinstance(cache_config, dict):
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cache_config = DiffusionCacheConfig.from_dict(cache_config)
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if cache_backend == "cache_dit":
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return CacheDiTBackend(cache_config)
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elif cache_backend == "tea_cache":
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return TeaCacheBackend(cache_config)
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else:
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raise ValueError(f"Unsupported cache backend: {cache_backend}. Supported: 'cache_dit', 'tea_cache'")
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