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[mlir][sparse] update BSR specification #67480

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Sep 26, 2023
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[mlir][sparse] update BSR specification #67480

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14 changes: 13 additions & 1 deletion mlir/include/mlir/Dialect/SparseTensor/IR/SparseTensorAttrDefs.td
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Original file line number Diff line number Diff line change
Expand Up @@ -217,14 +217,26 @@ def SparseTensorEncodingAttr : SparseTensor_Attr<"SparseTensorEncoding",
// Block sparse row storage (2x3 blocks).
#BSR = #sparse_tensor.encoding<{
map = ( i, j ) ->
( i floordiv 2 : compressed,
( i floordiv 2 : dense,
j floordiv 3 : compressed,
i mod 2 : dense,
j mod 3 : dense
)
}>
... tensor<20x30xf32, #BSR> ...

// Same block sparse row storage (2x3 blocks) but this time
// also with a redundant reverse mapping, which can be inferred.
#BSR_explicit = #sparse_tensor.encoding<{
map = ( i = ib * 2 + ii,
j = jb * 3 + jj) ->
( ib = i floordiv 2 : dense,
jb = j floordiv 3 : compressed,
ii = i mod 2 : dense,
jj = j mod 3 : dense)
}>
... tensor<20x30xf32, #BSR_explicit> ...

// CSR slice (offset = 0, size = 4, stride = 1 on the first dimension;
// offset = 0, size = 8, and a dynamic stride on the second dimension).
#CSR_SLICE = #sparse_tensor.encoding<{
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