[sparse] fix double free due to incompatibility between buffer-deallo… (#3303)

…cation and sparse tensors.

**NOTE**: This PR _doges_ the issue in buffer-deallocation pass instead
of resolving it. In the future, we need to fix the bug in
buffer-deallocation pass when handling code generated by sparse
compiler.

projects/pt1/python/torch_mlir_e2e_test/linalg_on_tensors_backends/refbackend.py

@@ -155,7 +155,8 @@ LOWERING_PIPELINE = (
             "sparse-assembler{direct-out}",
             "sparsification-and-bufferization",
             "sparse-storage-specifier-to-llvm",
-            "inline",  # inline sparse helper methods where useful
+            # Buffer deallocation pass does not know how to handle realloc.
+            "func.func(expand-realloc)",
             # Bufferize.
             "func.func(scf-bufferize)",
             "func.func(tm-tensor-bufferize)",
@@ -167,6 +168,9 @@ LOWERING_PIPELINE = (
             "func.func(tensor-bufferize)",
             "func.func(finalizing-bufferize)",
             "func.func(buffer-deallocation)",
+            # Buffer-deallocation does not work with the inlined code generated
+            # by sparse tensor dialect.
+            "inline",  # inline sparse helper methods where useful
             # Munge to make it ExecutionEngine compatible.
             # Specifically, we rewrite calling convention boundaries to be in terms
             # of unranked memref, and we rewrite the return to actually be a
@@ -180,7 +184,6 @@ LOWERING_PIPELINE = (
             "func.func(tm-tensor-to-loops)",
             "func.func(refback-munge-memref-copy)",
             "func.func(convert-linalg-to-loops)",
-            "func.func(expand-realloc)",
             "func.func(lower-affine)",
             "convert-scf-to-cf",
             "func.func(refback-expand-ops-for-llvm)",

test/python/fx_importer/sparse_test.py

@@ -364,26 +364,30 @@ def test_sparse_SpMM():
 # CHECK-LABEL: test_sparse_eltwise
 # CHECK:       #[[$CSRD:.*]] = #sparse_tensor.encoding<{ map = (d0, d1, d2) -> (d0 : dense, d1 : compressed, d2 : dense), posWidth = 64, crdWidth = 64 }>
 # CHECK:       func.func @main(
-# CHECK-SAME:    %[[A:.*]]: !torch.vtensor<[8,4,2],f32,#[[$CSRD]]>) -> !torch.vtensor<[8,4,2],f32,#[[$CSRD]]> {
-# CHECK:         %[[R:.*]] = torch.aten.neg %[[A]] : !torch.vtensor<[8,4,2],f32,#[[$CSRD]]> -> !torch.vtensor<[8,4,2],f32,#[[$CSRD]]>
-# CHECK:         return %[[R]] : !torch.vtensor<[8,4,2],f32,#[[$CSRD]]>
+# CHECK-SAME:    %[[A:.*]]: !torch.vtensor<[4,2,2],f32,#[[$CSRD]]>) -> !torch.vtensor<[4,2,2],f32,#[[$CSRD]]> {
+# CHECK:         %[[R:.*]] = torch.aten.neg %[[A]] : !torch.vtensor<[4,2,2],f32,#[[$CSRD]]> -> !torch.vtensor<[4,2,2],f32,#[[$CSRD]]>
+# CHECK:         return %[[R]] : !torch.vtensor<[4,2,2],f32,#[[$CSRD]]>
 # CHECK:       }
 # CHECK:       #[[$BCSR:.*]] = #sparse_tensor.encoding<{ map = (d0, d1, d2) -> (d0 : batch, d1 : dense, d2 : compressed), posWidth = 64, crdWidth = 64 }>
 # CHECK:       func.func @main(
-# CHECK-SAME:    %[[A:.*]]: !torch.vtensor<[8,4,2],f32,#[[$BCSR]]>) -> !torch.vtensor<[8,4,2],f32,#[[$BCSR]]> {
-# CHECK:         %[[R:.*]] = torch.aten.neg %[[A]] : !torch.vtensor<[8,4,2],f32,#[[$BCSR]]> -> !torch.vtensor<[8,4,2],f32,#[[$BCSR]]>
-# CHECK:         return %[[R]] : !torch.vtensor<[8,4,2],f32,#[[$BCSR]]>
+# CHECK-SAME:    %[[A:.*]]: !torch.vtensor<[4,2,2],f32,#[[$BCSR]]>) -> !torch.vtensor<[4,2,2],f32,#[[$BCSR]]> {
+# CHECK:         %[[R:.*]] = torch.aten.neg %[[A]] : !torch.vtensor<[4,2,2],f32,#[[$BCSR]]> -> !torch.vtensor<[4,2,2],f32,#[[$BCSR]]>
+# CHECK:         return %[[R]] : !torch.vtensor<[4,2,2],f32,#[[$BCSR]]>
 # CHECK:       }
 #
 # CHECK: torch.sparse
-# CHECK:   tensor(crow_indices=tensor([ 0,  4,  8, 12, 16, 20, 24, 28, 32]),
-# CHECK:          col_indices=tensor([0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1,
-# CHECK:                              2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3]),
+# CHECK:   tensor(crow_indices=tensor([0, 2, 4, 6, 8]),
+# CHECK:          col_indices=tensor([0, 1, 0, 1, 0, 1, 0, 1]),
 # CHECK:          values=tensor({{\[}}[ -1.,  -2.],
 #                                     ...
-# CHECK:                              [-63., -64.]{{\]}}), size=(8, 4, 2), nnz=32,
+# CHECK:                              [-15., -16.]{{\]}}), size=(4, 2, 2), nnz=8,
 # CHECK:                              layout=torch.sparse_csr)
+#
 # CHECK: torch.mlir
+# CHECK:   [0 2 4 6 8]
+# CHECK:   [0 1 0 1 0 1 0 1]
+# CHECK:   [ -1.  -2.  -3.  -4.  -5.  -6.  -7.  -8.  -9. -10. -11. -12. -13. -14.
+# CHECK:    -15. -16.]
 # CHECK: torch.mlir.batch
 #
 def test_sparse_eltwise():
@@ -396,7 +400,7 @@ def test_sparse_eltwise():
 
     net = EltNet()
     dense_input = torch.reshape(
-        torch.arange(1, 65, dtype=torch.float32), shape=(8, 4, 2)
+        torch.arange(1, 17, dtype=torch.float32), shape=(4, 2, 2)
     )
 
     # This yields a plain CSR with dense **sub**tensor
@@ -411,12 +415,15 @@ def test_sparse_eltwise():
 
     # Run it with PyTorch torch.sparse and with TORCH-MLIR sparse_jit.
     res1 = net(sparse_input)
+    res2 = sparse_jit(net, sparse_input)
     # TODO: make these work
-    # res2 = sparse_jit(net, sparse_input)
     # res3 = sparse_jit(net, batch_input)
     print("torch.sparse")
     print(res1)
     print("torch.mlir")
+    print(res2[0])
+    print(res2[1])
+    print(res2[2])
     print("torch.mlir.batch")