Add canonicalization pattern for maxpool3d with indices op (#3704)

As discussed in https://github.com/llvm/torch-mlir/pull/3652, we should
replace maxpool3dwithindices with maxpool3d if indices have no user.

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

@@ -7352,6 +7352,7 @@ def Torch_AtenMaxPool3dWithIndicesOp : Torch_Op<"aten.max_pool3d_with_indices",
       printDefaultTorchOp(printer, *this, 6, 2);
     }
   }];
+  let hasCanonicalizer = 1;
 }
 
 def Torch_AtenMaxPool3dWithIndicesBackwardOp : Torch_Op<"aten.max_pool3d_with_indices_backward", [

lib/Dialect/Torch/IR/TorchOps.cpp

@@ -5188,18 +5188,38 @@ OpFoldResult PrimsConvertElementTypeOp::fold(FoldAdaptor adaptor) {
 }
 
 //===----------------------------------------------------------------------===//
-// AtenMaxPool2dWithIndicesOp
+// AtenMaxPoolWithIndicesOp
 //===----------------------------------------------------------------------===//
 
-void AtenMaxPool2dWithIndicesOp::getCanonicalizationPatterns(
+namespace {
-    RewritePatternSet &patterns, MLIRContext *context) {
+
-  patterns.add(+[](AtenMaxPool2dWithIndicesOp op, PatternRewriter &rewriter) {
+template <typename OpTy> struct MaxPoolWithoutIndices {
+  using type = OpTy;
+};
+
+template <> struct MaxPoolWithoutIndices<AtenMaxPool2dWithIndicesOp> {
+  using type = AtenMaxPool2dOp;
+};
+
+template <> struct MaxPoolWithoutIndices<AtenMaxPool3dWithIndicesOp> {
+  using type = AtenMaxPool3dOp;
+};
+
+} // namespace
+
+template <typename OpTy>
+struct SimplifyMaxPoolWithIndices : public mlir::OpRewritePattern<OpTy> {
+  SimplifyMaxPoolWithIndices(mlir::MLIRContext *context)
+      : OpRewritePattern<OpTy>(context, /*benefit=*/1) {}
+
+  LogicalResult
+  matchAndRewrite(OpTy op, mlir::PatternRewriter &rewriter) const override {
     if (!op.getResult1().use_empty()) {
       return rewriter.notifyMatchFailure(
-          op, "result1 of MaxPool2dWithIndices should be unused");
+          op, "result1 of MaxPoolWithIndices should be unused");
     }
 
-    Value result = rewriter.create<Torch::AtenMaxPool2dOp>(
+    Value result = rewriter.create<typename MaxPoolWithoutIndices<OpTy>::type>(
         op->getLoc(), op.getResult0().getType(), op.getSelf(),
         op.getKernelSize(), op.getStride(), op.getPadding(), op.getDilation(),
         op.getCeilMode());
@@ -5207,7 +5227,17 @@ void AtenMaxPool2dWithIndicesOp::getCanonicalizationPatterns(
     op.getResult0().replaceAllUsesWith(result);
     rewriter.eraseOp(op);
     return success();
-  });
+  }
+};
+
+void AtenMaxPool2dWithIndicesOp::getCanonicalizationPatterns(
+    RewritePatternSet &patterns, MLIRContext *context) {
+  patterns.add<SimplifyMaxPoolWithIndices<AtenMaxPool2dWithIndicesOp>>(context);
+}
+
+void AtenMaxPool3dWithIndicesOp::getCanonicalizationPatterns(
+    RewritePatternSet &patterns, MLIRContext *context) {
+  patterns.add<SimplifyMaxPoolWithIndices<AtenMaxPool3dWithIndicesOp>>(context);
 }
 
 //===----------------------------------------------------------------------===//

projects/pt1/python/torch_mlir/jit_ir_importer/build_tools/torch_ods_gen.py

@@ -636,7 +636,8 @@ def emit_ops(emitter_td: TextEmitter, registry: Registry):
     emit("aten::max_pool3d : (Tensor, int[], int[], int[], int[], bool) -> (Tensor)")
     emit("aten::max_unpool3d : (Tensor, Tensor, int[], int[], int[]) -> (Tensor)")
     emit(
-        "aten::max_pool3d_with_indices : (Tensor, int[], int[], int[], int[], bool) -> (Tensor, Tensor)"
+        "aten::max_pool3d_with_indices : (Tensor, int[], int[], int[], int[], bool) -> (Tensor, Tensor)",
+        has_canonicalizer=True,
     )
     emit(
         "aten::max_pool3d_with_indices_backward : (Tensor, Tensor, int[], int[], int[], int[], bool, Tensor) -> (Tensor)"

test/Dialect/Torch/canonicalize.mlir

@@ -3136,6 +3136,24 @@ func.func @torch.aten.max_pool2d_with_indices$canonicalize(%arg0: !torch.vtensor
 
 // -----
 
+// CHECK-LABEL:   @torch.aten.max_pool3d_with_indices$canonicalize(
+// CHECK:            %[[ARG:.*]]: !torch.vtensor<[10,64,112,112,112],f32>) -> !torch.vtensor<[10,64,56,56,56],f32> {
+// CHECK:      %[[RET:.*]] = torch.aten.max_pool3d %[[ARG]]
+// CHECK:      return %[[RET]] : !torch.vtensor<[10,64,56,56,56],f32>
+func.func @torch.aten.max_pool3d_with_indices$canonicalize(%arg0: !torch.vtensor<[10,64,112,112,112],f32>) -> !torch.vtensor<[10,64,56,56,56],f32> {
+  %false = torch.constant.bool false
+  %int1 = torch.constant.int 1
+  %int2 = torch.constant.int 2
+  %int3 = torch.constant.int 3
+  %29 = torch.prim.ListConstruct %int3, %int3 : (!torch.int, !torch.int) -> !torch.list<int>
+  %30 = torch.prim.ListConstruct %int2, %int2 : (!torch.int, !torch.int) -> !torch.list<int>
+  %31 = torch.prim.ListConstruct %int1, %int1 : (!torch.int, !torch.int) -> !torch.list<int>
+  %result0, %result1 = torch.aten.max_pool3d_with_indices %arg0, %29, %30, %31, %31, %false : !torch.vtensor<[10,64,112,112,112],f32>, !torch.list<int>, !torch.list<int>, !torch.list<int>, !torch.list<int>, !torch.bool -> !torch.vtensor<[10,64,56,56,56],f32>, !torch.vtensor<[10,64,56,56,56],si64>
+  return %result0 : !torch.vtensor<[10,64,56,56,56],f32>
+}
+
+// -----
+
 // CHECK-LABEL:   @torch.aten.clone$no_fold(
 func.func @torch.aten.clone$no_fold(%arg0: !torch.vtensor<[1,2,50,4],f32>) -> (!torch.tensor) {
   // CHECK: %{{.*}} = torch.aten.clone %{{.*}}, %{{.*}} : !torch.vtensor<[1,2,50,4],f32>, !torch.none -> !torch.vtensor