Mojo struct
SlidingWindowCausalMask
struct SlidingWindowCausalMask[window_size: Int]
Mask implementing Sliding Window attention.
Considering the following case:
- Q_len = 7
- K_len = 7
- window_size = 3
The mask will be applied as follows: K > 0 1 2 3 4 5 6 Q v x------------x 0 | 1 0 0 0 0 0 0 1 | 1 1 0 0 0 0 0 2 | 1 1 1 0 0 0 0 3 | 0 1 1 1 0 0 0 4 | 0 0 1 1 1 0 0 5 | 0 0 0 1 1 1 0 6 | 0 0 0 0 1 1 1
Implemented traits
AnyType,
Copyable,
DevicePassable,
ImplicitlyCopyable,
ImplicitlyDestructible,
MHAMask,
Movable,
RegisterPassable,
TrivialRegisterPassable
comptime members
apply_log2e_after_mask
comptime apply_log2e_after_mask = False
check_mask_during_decoding
comptime check_mask_during_decoding = True
device_type
comptime device_type = SlidingWindowCausalMask[window_size]
mask_out_of_bound
comptime mask_out_of_bound = True
mask_safe_out_of_bounds
comptime mask_safe_out_of_bounds = True
Methods
get_type_name
name
mask
mask[dtype: DType, width: Int, *, element_type: DType = DType.uint32](self, coord: IndexList[4, element_type=element_type], score_vec: SIMD[dtype, width]) -> SIMD[dtype, width]
Returns:
status
status[*, element_type: DType = DType.uint32](self, tile_offset: IndexList[2, element_type=element_type], tile_size: IndexList[2, element_type=element_type]) -> TileMaskStatus
Returns:
TileMaskStatus
start_column
total_iters
total_iters[BM: Int, BN: Int, page_size: Int](self, row: UInt32, num_cols: UInt32) -> UInt32
Returns:
count_nonfull_sets
masked_set_ends
masked_set_ends[BM: Int, BN: Int, page_size: Int](self, row: UInt32, num_cols: UInt32) -> StaticTuple[UInt32, SlidingWindowCausalMask.count_nonfull_sets(BM, BN)]
Returns:
StaticTuple[UInt32, SlidingWindowCausalMask.count_nonfull_sets(BM, BN)]
last_masked_set_end
last_masked_set_end[BM: Int, BN: Int, page_size: Int](self, row: UInt32, num_cols: UInt32) -> UInt32
Returns:
nonfull_sets
static nonfull_sets[BM: Int, BN: Int]() -> StaticTuple[TileMaskStatus, SlidingWindowCausalMask.count_nonfull_sets(BM, BN)]
Returns:
StaticTuple[TileMaskStatus, SlidingWindowCausalMask.count_nonfull_sets(BM, BN)]
mask_strategies
static mask_strategies[BM: Int, BN: Int]() -> StaticTuple[MaskStrategy, SlidingWindowCausalMask.count_nonfull_sets(BM, BN)]
Returns:
StaticTuple[MaskStrategy, SlidingWindowCausalMask.count_nonfull_sets(BM, BN)]
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