map_matmul_to_mul_pass support 3dim (#31958)

paddle/fluid/framework/ir/map_matmul_to_mul_pass.cc

@@ -57,7 +57,7 @@ void MapMatmul2MulPass::ApplyImpl(ir::Graph* graph) const {
     std::vector<int64_t> y_shape = matmul_in_y->Var()->GetShape();
     size_t x_rank = x_shape.size();
     size_t y_rank = y_shape.size();
-    flag = flag && x_rank == 2 && y_rank == 2;
+    flag = flag && (x_rank == 2 || x_rank == 3) && y_rank == 2;
 
     std::vector<Node*>& next_ops = matmul_out->outputs;
     flag = flag && next_ops.size() == 1 &&
@@ -69,7 +69,7 @@ void MapMatmul2MulPass::ApplyImpl(ir::Graph* graph) const {
       desc.SetInput("X", {matmul_in_x->Name()});
       desc.SetInput("Y", {matmul_in_y->Name()});
       desc.SetOutput("Out", {matmul_out->Name()});
-      desc.SetAttr("x_num_col_dims", 1);
+      desc.SetAttr("x_num_col_dims", static_cast<int>(x_rank - 1));
       desc.SetAttr("y_num_col_dims", 1);
       if (matmul_op->Op()->HasAttr("enable_int8")) {
         desc.SetAttr("enable_int8", matmul_op->Op()->GetAttr("enable_int8"));