 ViperEkura
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5b67d5865a
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feat: add AttentionBackend ABC with context manager
- AttentionBackend ABC with forward_decode/forward_extend dispatch
- TorchNativeBackend: SDPA with indirect KV cache gather
- attn_backend() context manager + ATTN_BACKEND enum (mirrors sdpa_kernel)
- ContextVar-based thread-safe backend switching
- get_backend() falls back to default TorchNativeBackend singleton
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2026-07-30 18:20:27 +08:00 |
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