feat(mgb/serialization): add Accessor for OprLoader to fix BN output compatibility

GitOrigin-RevId: 3b95da02c8fa3cd2a6c6d47d7ede93b7b36aa3a7

imperative/src/impl/ops/opr_attr.cpp

@@ -76,7 +76,7 @@ public:
     }
 };
 
-cg::OperatorNodeBase* apply_on_var_node(
+VarNodeArray apply_on_var_node(
         const OpDef& def, const VarNodeArray& inputs) {
     auto&& attr = def.cast_final_safe<OprAttr>();
     auto config = attr.config;
@@ -85,7 +85,7 @@ cg::OperatorNodeBase* apply_on_var_node(
     auto registry = serialization::OprRegistry::find_by_name(attr.type);
     mgb_assert(registry, "operator %s not found", attr.type.c_str());
     OprParamsLoadContext ctx{attr.param, inputs[0]->owner_graph()};
-    return registry->loader(ctx, inputs, config);
+    return registry->loader(ctx, inputs, config).usable_output();
 }
 
 std::shared_ptr<OpDef> make_from_op_node(cg::OperatorNodeBase* opr) {

imperative/src/test/backward_graph.cpp

@@ -200,7 +200,7 @@ TEST(TestImperative, BatchNormGrad) {
     LogicalTensorDesc inp{TensorLayout{{N, C, H, W}, dtype::Float32()}, cn};
     LogicalTensorDesc stat{TensorLayout{{C}, dtype::Float32()}, cn};
     {
-        auto op = OprAttr::make("BatchNorm");
+        auto op = OprAttr::make("BatchNormV1");
         auto&& attr = op->cast_final_safe<OprAttr>();
         Param param;
         param.fwd_mode = Param::FwdMode::TRAINING;
@@ -210,7 +210,7 @@ TEST(TestImperative, BatchNormGrad) {
                                    {false, false, false, false, false, true});
     }
     {
-        auto op = OprAttr::make("BatchNorm");
+        auto op = OprAttr::make("BatchNormV1");
         auto&& attr = op->cast_final_safe<OprAttr>();
         Param param;
         param.fwd_mode = Param::FwdMode::TRAINING;

imperative/src/test/imperative.cpp

@@ -59,7 +59,7 @@ TEST(TestImperative, Reduce) {
 }
 
 TEST(TestImperative, BatchNorm) {
-     auto op = OprAttr::make("BatchNorm");
+     auto op = OprAttr::make("BatchNormV1");
      auto&& attr = op->cast_final_safe<OprAttr>();
      using Param = opr::BatchNorm::Param;
      Param param;

src/opr/impl/dnn/dnn.sereg.h

@@ -16,14 +16,13 @@
 #include "megbrain/opr/dnn/correlation.h"
 #include "megbrain/opr/dnn/fake_quant.h"
 #include "megbrain/opr/dnn/images2neibs.h"
-#include "megbrain/opr/dnn/sliding_window_transpose.h"
-#include "megbrain/opr/dnn/adaptive_pooling.h"
 #include "megbrain/opr/dnn/local.h"
 #include "megbrain/opr/dnn/lrn.h"
 #include "megbrain/opr/dnn/lsq.h"
 #include "megbrain/opr/dnn/pooling.h"
 #include "megbrain/opr/dnn/roi_align.h"
 #include "megbrain/opr/dnn/roi_pooling.h"
+#include "megbrain/opr/dnn/sliding_window_transpose.h"
 #include "megbrain/opr/dnn/tqt.h"
 #include "megbrain/serialization/sereg.h"
 #include "megdnn/opr_param_defs.h"
@@ -390,6 +389,7 @@ struct OprMaker<opr::BatchNorm, 0> {
     }
 };
 
+// OprMaker in MGB_SEREG_OPR only support unique output opr
 template <>
 struct OprMaker<opr::BatchNormBackward, 6> {
     using Param = opr::BatchNormBackward::Param;
@@ -398,8 +398,8 @@ struct OprMaker<opr::BatchNormBackward, 6> {
                                       ComputingGraph& graph,
                                       const OperatorNodeConfig& config) {
         MGB_MARK_USED_VAR(graph);
-        return opr::BatchNormBackward::make(i[0], i[1], i[2], i[3], i[4], i[5], param,
-                                            config)[0]
+        return opr::BatchNormBackward::make(i[0], i[1], i[2], i[3], i[4], i[5],
+                                            param, config)[0]
                 .node()
                 ->owner_opr();
     }
@@ -575,8 +575,10 @@ MGB_SEREG_OPR(Convolution3DBackwardFilter, 0);
 using ConvBiasForwardV4 = ConvBiasForward;
 MGB_SEREG_OPR(ConvBiasForwardV4, 0);
 
-MGB_SEREG_OPR(BatchNorm, 0);
-MGB_SEREG_OPR(BatchNormBackward, 6);
+using BatchNormV1 = BatchNorm;
+using BatchNormBackwardV1 = BatchNormBackward;
+MGB_SEREG_OPR(BatchNormV1, 0);
+MGB_SEREG_OPR(BatchNormBackwardV1, 6);
 
 using LocalShareForwardV1 = LocalShareForward;
 using LocalShareBackwardDataV1 = LocalShareBackwardData;

src/serialization/impl/opr_registry.cpp

@@ -39,7 +39,7 @@ namespace {
         return inst;
     }
 
-    cg::OperatorNodeBase* dynamic_loader(
+    OprWithOutputAccessor dynamic_loader(
             OprLoadContext &ctx, const cg::VarNodeArray &inputs,
             const OperatorNodeConfig &config) {
         auto name = ctx.load_buf_with_len();
@@ -171,4 +171,20 @@ std::vector<std::pair<size_t, std::string>> OprRegistry::dump_registries() {
 }
 #endif
 
+namespace {
+const VarNodeArray& default_accessor(const VarNodeArray& outputs) {
+    return outputs;
+}
+}
+
+OprWithOutputAccessor::OprWithOutputAccessor(cg::OperatorNodeBase* opr) : m_opr(opr){
+    m_accessor = &default_accessor;
+};
+OprWithOutputAccessor::OprWithOutputAccessor(cg::OperatorNodeBase* opr, Accessor accessor)
+        : OprWithOutputAccessor(opr) {
+    if (accessor) {
+        m_accessor = accessor;
+    }
+};
+
 // vim: syntax=cpp.doxygen foldmethod=marker foldmarker=f{{{,f}}}

src/serialization/impl/opr_shallow_copy.cpp

@@ -207,7 +207,7 @@ cg::OperatorNodeBase* serialization::intl::copy_opr_shallow_default_impl(
     registry->dumper(dumper, opr);
 
     OprLoadContextMemory loader{opr.owner_graph(), dumper};
-    return registry->loader(loader, inputs, config);
+    return registry->loader(loader, inputs, config).opr();
 }
 
 // vim: syntax=cpp.doxygen foldmethod=marker foldmarker=f{{{,f}}}

src/serialization/impl/serializer_oss.cpp

@@ -782,7 +782,8 @@ void GraphLoaderOSS::OprLoadContextImpl::load_single_opr(
     }
 
     // call loader
-    auto opr = registry->loader(*this, inputs, config);
+    auto accessor = registry->loader(*this, inputs, config);
+    auto opr = accessor.opr();
 
     // check opr type; note that:
     // 1. registry->type may be empty for dynamic opr loaders or legacy oprs
@@ -794,7 +795,7 @@ void GraphLoaderOSS::OprLoadContextImpl::load_single_opr(
             opr ? opr->dyn_typeinfo()->name : nullptr, registry->type->name);
     // record output vars; read output names
     size_t i = 0;
-    for (auto ovar : opr->output()) {
+    for (auto ovar : accessor.output()) {
         if (!ovar->contain_flag(VarNode::Flag::VOLATILE_CONTENT)) {
             m_id2varnode.push_back(ovar);
             if (fbopr->output_name()) {

src/serialization/include/megbrain/serialization/opr_registry.h

@@ -19,16 +19,36 @@ namespace serialization {
     class OprDumpContext;
     class OprLoadContext;
     class OprShallowCopyContext;
+    class OprWithOutputAccessor {
+        cg::OperatorNodeBase* m_opr;
+        using Accessor = thin_function<const VarNodeArray(const VarNodeArray&)>;
+        Accessor m_accessor;
+
+    public:
+        OprWithOutputAccessor(cg::OperatorNodeBase* opr);
+        OprWithOutputAccessor(cg::OperatorNodeBase* opr, Accessor accessor);
+        VarNode* output(size_t idx) const { return output().at(idx); }
+        VarNodeArray output() const { return m_accessor(m_opr->output()); }
+        VarNodeArray usable_output() const { return m_accessor(m_opr->usable_output()); }
+        cg::OperatorNodeBase* opr() { return m_opr; }
+    };
+
 
     //! dump opr internal params to OprDumpContext
     using OprDumper = thin_function<void(
             OprDumpContext &ctx, const cg::OperatorNodeBase &opr)>;
 
     //! load and restore operator from OprLoadContext
+    //! is also used by GraphLoadConfig.
     using OprLoader = thin_function<cg::OperatorNodeBase*(
             OprLoadContext &ctx, const cg::VarNodeArray &inputs,
             const OperatorNodeConfig &config)>;
 
+    //! loader that can change opr output map for compatibility
+    using OprLoaderWrapper = thin_function<OprWithOutputAccessor(
+            OprLoadContext &ctx, const cg::VarNodeArray &inputs,
+            const OperatorNodeConfig &config)>;
+
     //! shallow copy function for a single operator
     using OprShallowCopy = thin_function<cg::OperatorNodeBase*(
             const OprShallowCopyContext &ctx,
@@ -41,7 +61,7 @@ namespace serialization {
         uint64_t persist_type_id;
         std::string name;
         OprDumper dumper;
-        OprLoader loader;
+        OprLoaderWrapper loader;
         OprShallowCopy shallow_copy; //!< set to empty to use default impl
         uint64_t unversioned_type_id;
 

src/serialization/include/megbrain/serialization/sereg.h

@@ -169,11 +169,17 @@ namespace {  \
  */
 #define MGB_SEREG_OPR(_cls, _arity)                                            \
     namespace {                                                                \
+    namespace ser = ::mgb::serialization;                                      \
     struct _OprReg##_cls {                                                     \
+        using Impl = ser::OprLoadDumpImpl<_cls, _arity>;                       \
+        static ser::OprWithOutputAccessor wrap_loader(                         \
+                ser::OprLoadContext& ctx, const mgb::cg::VarNodeArray& inputs, \
+                const mgb::cg::OperatorNodeConfig& config) {                   \
+            return ser::OprWithOutputAccessor(                                 \
+                    Impl::load(ctx, inputs, config));                          \
+        }                                                                      \
         static void entry() {                                                  \
-                using Impl = ::mgb::serialization::OprLoadDumpImpl< \
-                    _cls, _arity>; \
-                MGB_SEREG_OPR_INTL_CALL_ADD(_cls, Impl::dump, Impl::load); \
+            MGB_SEREG_OPR_INTL_CALL_ADD(_cls, Impl::dump, wrap_loader);        \
         }                                                                      \
     };                                                                         \
     }                                                                          \
@@ -187,22 +193,21 @@ template <class T>
 struct IsComplete<T, decltype(void(sizeof(T)))> : std::true_type {};
 
 //! call OprRegistry::add with only loader, used for backward compatibility
-#define MGB_SEREG_OPR_COMPAT(_name, _load)                                  \
+#define MGB_SEREG_OPR_COMPAT_WITH_ACCESSOR(_name, _load, _accessor)            \
     namespace {                                                                \
     static_assert(IsComplete<_name>(),                                         \
                   "need a complete type for MGB_SEREG_OPR_COMPAT");            \
+    namespace ser = ::mgb::serialization;                                      \
     struct _OprReg##_name {                                                    \
-        static cg::OperatorNodeBase* compat_loader(                         \
-                serialization::OprLoadContext& ctx,                         \
-                const cg::VarNodeArray& inputs,                             \
-                const OperatorNodeConfig& config) {                         \
-            return _load(                                                   \
-                    static_cast<serialization::OprLoadContextRawPOD&>(ctx), \
-                    inputs, config);                                        \
+        static ser::OprWithOutputAccessor compat_loader(                       \
+                ser::OprLoadContext& ctx, const mgb::cg::VarNodeArray& inputs, \
+                const mgb::cg::OperatorNodeConfig& config) {                   \
+            auto&& ctx_ = static_cast<ser::OprLoadContextRawPOD&>(ctx);        \
+            return ser::OprWithOutputAccessor(_load(ctx_, inputs, config),     \
+                                              _accessor);                      \
         }                                                                      \
         static void entry() {                                                  \
-            ::mgb::serialization::OprRegistry::add(                         \
-                    {nullptr,                                               \
+            ser::OprRegistry::add({nullptr,                                    \
                                    MGB_HASH_STR(#_name),                       \
                                    _MGB_SEREG_OPR_NAME_FROM_CLS(_name),        \
                                    nullptr,                                    \
@@ -214,6 +219,9 @@ struct IsComplete<T, decltype(void(sizeof(T)))> : std::true_type {};
     }                                                                          \
     MGB_SEREG_OPR_INTL_CALL_ENTRY(_name, _OprReg##_name)
 
+#define MGB_SEREG_OPR_COMPAT(_name, _load) \
+    MGB_SEREG_OPR_COMPAT_WITH_ACCESSOR(_name, _load, nullptr)
+
 /*!
  * \brief use \p _copy to implement shallow copy for given operator
  */