Revert "fix(imperative): fix the split dump problem"

This reverts commit 8380af7b464f169b58b1c52791bac0fc983b4f40.

GitOrigin-RevId: 062ed1ebb112b55ad52d6d5479c01fd26085dc5c

imperative/python/src/tensor_utils.cpp

@@ -400,6 +400,7 @@ py::object get_res_by_refhdl(
         ref = py::reinterpret_borrow<py::object>(ref_hdl);
     }
     if (PyObject_TypeCheck(ref.ptr(), py_varnode_type)) {
+        auto temp = dtype.cast<mgb::DType>();
         ComputingGraph* graph = getattr(ref, "graph").cast<ComputingGraph*>();
         cg::VarNode* node = getattr(ref, "var").cast<cg::VarNode*>();
         CompNode cn;
@@ -1472,23 +1473,8 @@ py::object _split_cpp(
                     std::to_string(axis) + " cannot be split into " +
                     std::to_string(n_sections) + " sections");
         }
-        if (enable_fastpath(inp_hdl)) {
-            op = Split::make(axis, n_sections);
-            p.resize(2);
-        } else {
-            size_t n_total_ = n_total.cast<int>();
-            for (size_t i = 0; i < n_sections; ++i) {
-                auto section_size = (n_total_ + n_sections - i - 1) / n_sections;
-                partitions.append(_Const(
-                        py::int_(section_size), py::cast((mgb::DType)dtype::Int32()),
-                        getattr(inp_hdl, "device")));
-            }
-            op = Split::make(axis, 0);
-            p.resize(partitions.size() + 2);
-            for (size_t i = 0; i < partitions.size(); ++i) {
-                p[i + 2] = partitions[i].ptr();
-            }
-        }
+        op = Split::make(axis, n_sections);
+        p.resize(2);
     }
     py::object Op = py::cast(op);
     p[0] = Op.ptr();