[LINALG] Add value tensor variant to `bernoulli_.float` (#597)

This commit adds the op `PseudoAtenBernoulliFloatOp` that represents
`AtenBernoulli_FloatOp` without the underscore. This is needed to make
sure that the `ReduceOpVariants` pass turns the in-place op into an op
that takes value tensors as inputs, otherwise the
`MaximizeValueSemantics` pass will not be able to add value semantics
correctly.

include/torch-mlir/Dialect/Torch/IR/TorchOps.td

@@ -931,6 +931,24 @@ def Torch_PseudoAtenUniformOp: Torch_Op<"pseudo.aten.uniform", [
   let assemblyFormat = "$self `,` $from `,` $to `,` $generator attr-dict `:` type($self) `,` type($from) `,` type($to) `,` type($generator) `->` type($result)";
 }
 
+// The corresponding without underscore variant for `torch.aten.bernoulli_.float`
+// doesn't exist in the pytorch ops registry. Add it here.
+def Torch_PseudoAtenBernoulliFloatOp: Torch_Op<"pseudo.aten.bernoulli.float", [
+    AllowsTypeRefinement,
+    HasValueSemantics,
+  ]> {
+  let summary = "`bernoulli.float op : (Tensor, float, Generator?) -> (Tensor)`";
+  let arguments = (ins
+    AnyTorchTensorType:$self,
+    Torch_FloatType:$p,
+    TorchOptionalGeneratorType:$generator
+  );
+  let results = (outs
+    AnyTorchTensorType:$result
+  );
+  let assemblyFormat = "$self `,` $p `,` $generator attr-dict `:` type($self) `,` type($p) `,` type($generator) `->` type($result)";
+}
+
 // To handle runtime assertions, torchscript provides us `torch._assert` operation. 
 // But TS compiler introduces control flow for `torch._assert` operation. The 
 // `torch._assert` would introduce control flow like: 

lib/Dialect/Torch/Transforms/DecomposeComplexOps.cpp

@@ -778,11 +778,11 @@ public:
 } // namespace
 
 namespace {
-class DecomposeAtenBernoulli_FloatOp
-    : public OpRewritePattern<AtenBernoulli_FloatOp> {
+class DecomposePseudoAtenBernoulliFloatOp
+    : public OpRewritePattern<PseudoAtenBernoulliFloatOp> {
 public:
   using OpRewritePattern::OpRewritePattern;
-  LogicalResult matchAndRewrite(AtenBernoulli_FloatOp op,
+  LogicalResult matchAndRewrite(PseudoAtenBernoulliFloatOp op,
                                 PatternRewriter &rewriter) const override {
     Location loc = op.getLoc();
     Value self = op.self();
@@ -1155,8 +1155,8 @@ class DecomposeComplexOpsPass
     target.addIllegalOp<Aten_UnsafeViewOp>();
     patterns.add<DecomposeAtenBernoulliOp>(context);
     target.addIllegalOp<AtenBernoulliOp>();
-    patterns.add<DecomposeAtenBernoulli_FloatOp>(context);
-    target.addIllegalOp<AtenBernoulli_FloatOp>();
+    patterns.add<DecomposePseudoAtenBernoulliFloatOp>(context);
+    target.addIllegalOp<PseudoAtenBernoulliFloatOp>();
 
     if (failed(applyPartialConversion(getOperation(), target,
                                       std::move(patterns)))) {

lib/Dialect/Torch/Transforms/ReduceOpVariants.cpp

@@ -126,14 +126,21 @@ public:
       : RewritePattern(MatchAnyOpTypeTag(), /*benefit=*/1, context) {}
   LogicalResult matchAndRewrite(Operation *op,
                                 PatternRewriter &rewriter) const override {
-    if (!isa<AtenUniform_Op>(op))
+    Location loc = op->getLoc();
+    Operation *newOp;
+    if (isa<AtenUniform_Op>(op)) {
+      newOp = rewriter.create<PseudoAtenUniformOp>(loc, op->getResultTypes(),
+                                                   op->getOperands());
+    } else if (isa<AtenBernoulli_FloatOp>(op)) {
+      newOp = rewriter.create<PseudoAtenBernoulliFloatOp>(
+          loc, op->getResultTypes(), op->getOperands());
+    } else {
       return failure();
+    }
 
-    Operation *newOp = rewriter.create<PseudoAtenUniformOp>(
-        op->getLoc(), op->getResultTypes(), op->getOperands());
     auto tensor =
-        rewriter.create<CopyToValueTensorOp>(op->getLoc(), newOp->getResult(0));
-    rewriter.create<OverwriteTensorOp>(op->getLoc(), tensor, op->getOperand(0));
+        rewriter.create<CopyToValueTensorOp>(loc, newOp->getResult(0));
+    rewriter.create<OverwriteTensorOp>(loc, tensor, op->getOperand(0));
     rewriter.replaceOp(op, op->getOperand(0));
     return success();
   }
@@ -202,6 +209,7 @@ class ReduceOpVariantsPass : public ReduceOpVariantsBase<ReduceOpVariantsPass> {
     ConversionTarget target(*context);
     target.addIllegalOp<NonValueTensorLiteralOp>();
     target.addIllegalOp<AtenUniform_Op>();
+    target.addIllegalOp<AtenBernoulli_FloatOp>();
     target.markUnknownOpDynamicallyLegal([](Operation *op) {
       if (op->hasTrait<Torch::OpTrait::HasValueSemantics>()) {
         auto hasValueSemantics = [](Type t) {

lib/Dialect/Torch/Transforms/RefineTypes.cpp

@@ -228,7 +228,8 @@ public:
             AtenLog2Op, Aten_SoftmaxBackwardDataOp, AtenRsqrtOp, AtenDropoutOp,
             AtenTanhBackwardOp, Aten_LogSoftmaxBackwardDataOp, AtenAddIntOp,
             AtenAbsOp, AtenThresholdOp, AtenSquareOp, PseudoAtenUniformOp,
-            AtenCloneOp, AtenBernoulliOp, AtenBernoulli_FloatOp>(op)) {
+            AtenCloneOp, AtenBernoulliOp, AtenBernoulli_FloatOp,
+            PseudoAtenBernoulliFloatOp>(op)) {
       return getLatticeElement(op->getResult(0)).join(*operands[0]);
     }
 

test/Dialect/Torch/reduce-op-variants.mlir

@@ -144,3 +144,20 @@ func @torch.aten.uniform_(%t: !torch.tensor, %min: !torch.float, %max: !torch.fl
   %ret = torch.aten.uniform_ %t, %min, %max, %generator: !torch.tensor, !torch.float, !torch.float, !torch.none -> !torch.tensor
   return %ret : !torch.tensor
 }
+
+// CHECK-LABEL:   func @torch.aten.bernoulli_.float(
+// CHECK-SAME:                                      %[[T:.*]]: !torch.tensor) -> !torch.tensor {
+// CHECK:           %[[GENERATOR:.*]] = torch.constant.none
+// CHECK:           %[[P:.*]] = torch.constant.float 5.000000e-01
+// CHECK:           %[[T_VTENSOR:.*]] = torch.copy.to_vtensor %[[T]] : !torch.vtensor
+// CHECK:           %[[VRET:.*]] = torch.pseudo.aten.bernoulli.float %[[T_VTENSOR]], %[[P]], %[[GENERATOR]] : !torch.vtensor, !torch.float, !torch.none -> !torch.vtensor
+// CHECK:           %[[RET:.*]] = torch.copy.to_tensor %[[VRET]] : !torch.tensor
+// CHECK:           %[[COPY_VTENSOR:.*]] = torch.copy.to_vtensor %[[RET]] : !torch.vtensor
+// CHECK:           torch.overwrite.tensor %[[COPY_VTENSOR]] overwrites %[[T]] : !torch.vtensor, !torch.tensor
+// CHECK:           return %[[T]] : !torch.tensor
+func @torch.aten.bernoulli_.float(%t: !torch.tensor) -> !torch.tensor {
+  %generator = torch.constant.none
+  %p = torch.constant.float 5.000000e-01
+  %ret = torch.aten.bernoulli_.float %t, %p, %generator : !torch.tensor, !torch.float, !torch.none -> !torch.tensor
+  return %ret : !torch.tensor
+}