KVCacheLayout (v1/kv_cache_layout.py)

Enum describing physical KV cache layout permutations for efficient memory access.

# Source: https://github.com/vllm-project/vllm | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
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# SPDX-License-Identifier: Apache-2.0
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"""Physical KV cache layout descriptor.

A leaf module so ``vllm.config`` can import the enum without pulling in the
full KV cache interface.
"""

from enum import Enum

# Logical dim indices in the 5D stride permutation [L, B, H, N, C] (see: RFC #42082).
_DIM_L, _DIM_B, _DIM_H, _DIM_N, _DIM_C = 0, 1, 2, 3, 4


class KVCacheLayout(Enum):
    """Physical layout descriptor for a KV cache group.

    The logical shape is always [L, B, H, N, <content>] (RFC #42082).
    Each member's val

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