Mojo module

mha_mask

comptime values

MASK_VALUE

comptime MASK_VALUE = -10000

Structs

• ​AndMask: Mask that's the AND of two masks.
• ​CausalMask: MHA causal mask ensures a token is only affected by previous tokens.
• ​CausalPaddingMask: Causal mask combined with padding: a position (seq_id, head, q, k) is visible only when q >= k (causal) AND k < valid_lengths[seq_id] (padding).
• ​ChunkedMask: Mask implementing Chunked attention.
• ​MaskName: A tile's masking status.
• ​MaskStrategy:
• ​MaterializedMask: Mask that's backed by a materialized tensor.
• ​NullMask: Mask that's effectively a noop.
• ​OrMask: Mask that's the OR of two masks.
• ​SlidingWindowCausalMask: Mask implementing Sliding Window attention.
• ​TileMaskStatus: A tile's masking status.

Traits

• ​MHAMask: The MHAMask trait describes masks for MHA kernels, such as the causal mask.

Functions

• ​ChunkedCausalMask: Mask implementing Chunked Causal attention for Llama4 models.
• ​naively_compute_total_iters:
• ​naively_get_first_nonempty_mask_col:

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