[Torch] support 1d aten tensor shape and dtype infer (#3776)

lib/Dialect/Torch/Transforms/SimplifyShapeCalculations.cpp

@@ -46,6 +46,62 @@ public:
 };
 } // namespace
 
+namespace {
+class InferTensorOp : public OpRewritePattern<AtenTensorOp> {
+public:
+  using OpRewritePattern::OpRewritePattern;
+  LogicalResult matchAndRewrite(AtenTensorOp op,
+                                PatternRewriter &rewriter) const override {
+    auto context = op.getContext();
+    auto loc = op.getLoc();
+    auto result = op.getResult();
+    auto resultType = cast<BaseTensorType>(result.getType());
+    if (resultType.hasSizes() && resultType.hasDtype()) {
+      return rewriter.notifyMatchFailure(
+          op, "The result of aten.tensor is already a BaseTensorType.");
+    }
+
+    auto inputList = op.getOperand(0);
+    auto listConstruct = inputList.getDefiningOp<PrimListConstructOp>();
+    if (!listConstruct) {
+      return rewriter.notifyMatchFailure(
+          op, "The operand 0 of aten.tensor is not PrimListConstructOp.");
+    }
+
+    // Currently only support the 1d input list.
+    SmallVector<int64_t> sizes;
+    sizes.push_back(listConstruct->getOperands().size());
+    FailureOr<Type> torchType;
+    auto eleType = listConstruct->getOperands()[0].getType();
+    if (isa<Torch::IntType>(eleType)) {
+      torchType = getTypeForScalarType(op->getContext(),
+                                       torch_upstream::ScalarType::Long);
+    } else if (isa<Torch::FloatType>(eleType)) {
+      torchType = getTypeForScalarType(op->getContext(),
+                                       torch_upstream::ScalarType::Float);
+    } else {
+      return rewriter.notifyMatchFailure(
+          op, "Currently only support Int and Float Type.");
+    }
+    auto newResultType = ValueTensorType::get(context, sizes, *torchType);
+
+    Value originalTypedValue;
+    for (OpOperand &use : llvm::make_early_inc_range(result.getUses())) {
+      if (!originalTypedValue) {
+        rewriter.setInsertionPointAfter(op);
+        originalTypedValue =
+            rewriter.create<TensorStaticInfoCastOp>(loc, resultType, result);
+      }
+      use.set(originalTypedValue);
+    }
+
+    result.setType(newResultType);
+
+    return success();
+  }
+};
+} // namespace
+
 static LogicalResult refineShapeCalculateResult(ShapeCalculateOp op,
                                                 int resultNum,
                                                 PatternRewriter &rewriter) {
@@ -135,6 +191,7 @@ class SimplifyShapeCalculationsPass
     populateFoldPrimUncheckedCastOpPattern(patterns, context);
     patterns.insert<DecomposeAtenSizeOp>(context);
     patterns.insert<RefineShapeCalculateOp>(context);
+    patterns.insert<InferTensorOp>(context);
 
     PrimIfOp::getCanonicalizationPatterns(patterns, context);
     Aten__Getitem__TOp::getCanonicalizationPatterns(patterns, context);

projects/pt1/python/torch_mlir_e2e_test/test_suite/basic.py

@@ -5226,6 +5226,30 @@ def ConstantBoolParameterModule_basic(module, tu: TestUtils):
 # ==============================================================================
 
 
+class TensorAlloc1dStaticModule(torch.nn.Module):
+    def __init__(self):
+        super().__init__()
+
+    @export
+    @annotate_args(
+        [
+            None,
+            ([2, 4, 6], torch.int, True),
+        ]
+    )
+    def forward(self, x):
+        res = torch.tensor([x.shape[0]])
+        return res
+
+
+@register_test_case(module_factory=lambda: TensorAlloc1dStaticModule())
+def TensorAlloc1dStaticModule_basic(module, tu: TestUtils):
+    module.forward(tu.rand(2, 4, 6))
+
+
+# ==============================================================================
+
+
 class ScalarTensorFloat32Module(torch.nn.Module):
     def __init__(self):
         super().__init__()