fix(mge/parampacksplit): fix param pack split mem forward

GitOrigin-RevId: 8c001b73ffbd086f0cfff7cac2a4c1037bfcecfb

imperative/python/megengine/jit/tracing.py

@@ -308,6 +308,7 @@ class trace:
 
     def _apply_graph_options(self, graph):
 
+        graph.options.seq_opt.enable_seq_comp_node_opt = False
         # sublinear
         if self._sublinear_memory_config is not None:
             graph.options.enable_sublinear_memory_opt = True

src/opr/impl/tensor_manip.cpp

@@ -1496,6 +1496,14 @@ void ParamPackSplit::init_output_dtype() {
     // already initialized in constructor
 }
 
+void ParamPackSplit::init_rt_force_dynamic_mem_alloc_imply_chain() {
+    for (size_t i = 0; i < output().size(); ++i) {
+        auto s = input(0), t = output(i);
+        s->add_rt_force_dynamic_mem_alloc_imply_chain(t);
+        t->add_rt_force_dynamic_mem_alloc_imply_chain(s);
+    }
+}
+
 void ParamPackSplit::mem_plan_fwd_in2out_readonly() {
     mgb_assert(m_offsets.size() == output().size() * 2);
     for (size_t i = 0; i < output().size(); i++) {
@@ -1516,16 +1524,19 @@ void ParamPackSplit::init_output_static_infer_desc() {
     using namespace std::placeholders;
     auto&& mgr = owner_graph()->static_infer_manager();
 
-    DepVal shp_deps{{input(0), DepType::SHAPE}};
-
     for (size_t i = 0; i < output().size(); i++) {
         auto ov = output(i);
         mgr.register_shape_infer(
-                ov, {SourceType::DEP, shp_deps,
+                ov, {SourceType::CONSTANT, {},
                      std::bind(&ParamPackSplit::infer_shape, this, i, _1, _2)});
     }
 }
 
+void ParamPackSplit::scn_do_execute() {
+    int inp_size = input(0)->shape().total_nr_elems();
+    mgb_assert(inp_size == m_offsets.back(), "input shape should match offsets");
+}
+
 #ifdef MGB_ENABLE_GRAD
 MGB_IMPL_OPR_GRAD(ParamPackSplit) {
     mgb_assert(out_grad.size() == opr.output().size());

src/opr/include/megbrain/opr/tensor_manip.h

@@ -591,7 +591,7 @@ MGB_DEFINE_OPR_CLASS(ParamPackSplit, cg::SingleCNOperatorNodeBase) // {
     TensorShapeArray m_shapes;
     std::vector<dt_int32> m_offsets;
 
-    void scn_do_execute() override{};
+    void scn_do_execute() override;
     void init_output_static_infer_desc() override;
     bool infer_shape(size_t index, TensorShape &dest,
             const cg::static_infer::InpVal &inp);
@@ -615,6 +615,8 @@ public:
     const TensorShapeArray& get_output_shapes() const {
         return m_shapes;
     }
+
+    void init_rt_force_dynamic_mem_alloc_imply_chain() override;
 };
 
 /*!