perf(imperative/src): improve pad host performance

GitOrigin-RevId: 05223deca753dd862e40f6f8a26c1fca56d8e216

dnn/include/megdnn/oprs/general.h

@@ -1406,6 +1406,7 @@ public:
 
 protected:
     SmallVector<size_t> get_offsets();
+    MGE_WIN_DECLSPEC_FUC static SmallVector<size_t> get_offsets_impl(const Param& p);
     void check_exec(const TensorLayout& src, const TensorLayout& dst);
 };
 
@@ -1421,6 +1422,9 @@ public:
             const TensorLayout& src, const TensorLayout& dst) = 0;
     void deduce_layout(const TensorLayout& src, TensorLayout& dst);
 
+    MGE_WIN_DECLSPEC_FUC static void deduce_layout_impl(
+            const TensorLayout& src, TensorLayout& dst, const Param& p);
+
 protected:
     void forward_check_exec(const TensorLayout& src, const TensorLayout& dst);
 };

dnn/src/common/padding.cpp

@@ -7,6 +7,7 @@
 namespace megdnn {
 
 using padding_param = megdnn::param_enumv::Padding;
+using Param = PaddingBase::Param;
 
 void PaddingForward::forward_check_exec(
         const TensorLayout& src, const TensorLayout& dst) {
@@ -19,8 +20,9 @@ void PaddingForward::forward_check_exec(
             "unsupported %s dtype for forward padding opr", src.dtype.name());
 }
 
-void PaddingForward::deduce_layout(const TensorLayout& src, TensorLayout& dst) {
-    SmallVector<size_t> offsets(get_offsets());
+void PaddingForward::deduce_layout_impl(
+        const TensorLayout& src, TensorLayout& dst, const Param& p) {
+    SmallVector<size_t> offsets(get_offsets_impl(p));
     TensorShape dst_shape;
     switch (src.ndim) {
         case 1:
@@ -76,6 +78,10 @@ void PaddingForward::deduce_layout(const TensorLayout& src, TensorLayout& dst) {
     dst = TensorLayout(dst_shape, src.dtype);
 }
 
+void PaddingForward::deduce_layout(const TensorLayout& src, TensorLayout& dst) {
+    return deduce_layout_impl(src, dst, param());
+}
+
 void PaddingBackward::backward_check_exec(
         const TensorLayout& src, const TensorLayout& dst) {
     check_exec(dst, src);
@@ -86,17 +92,20 @@ void PaddingBackward::backward_check_exec(
             "unsupported %s dtype for forward padding opr", src.dtype.name());
 }
 
-SmallVector<size_t> PaddingBase::get_offsets() {
-    SmallVector<size_t> offsets = {param().front_offset_dim0, param().back_offset_dim0,
-                                   param().front_offset_dim1, param().back_offset_dim1,
-                                   param().front_offset_dim2, param().back_offset_dim2,
-                                   param().front_offset_dim3, param().back_offset_dim3,
-                                   param().front_offset_dim4, param().back_offset_dim4,
-                                   param().front_offset_dim5, param().back_offset_dim5,
-                                   param().front_offset_dim6, param().back_offset_dim6};
+SmallVector<size_t> PaddingBase::get_offsets_impl(const Param& p) {
+    SmallVector<size_t> offsets = {
+            p.front_offset_dim0, p.back_offset_dim0,  p.front_offset_dim1,
+            p.back_offset_dim1,  p.front_offset_dim2, p.back_offset_dim2,
+            p.front_offset_dim3, p.back_offset_dim3,  p.front_offset_dim4,
+            p.back_offset_dim4,  p.front_offset_dim5, p.back_offset_dim5,
+            p.front_offset_dim6, p.back_offset_dim6};
     return offsets;
 }
 
+SmallVector<size_t> PaddingBase::get_offsets() {
+    return get_offsets_impl(param());
+}
+
 void PaddingBase::check_exec(const TensorLayout& src, const TensorLayout& dst) {
     SmallVector<size_t> offsets(get_offsets());
     // make sure the src and dst tensor not empty

imperative/src/impl/ops/padding.cpp

+#include "megbrain/graph/symbol_var.h"
+#include "megbrain/imperative/ops/autogen.h"
+#include "megbrain/imperative/physical_tensor.h"
+#include "megbrain/imperative/proxy_graph_detail.h"
+#include "megbrain/opr/basic_arith.h"
+#include "megbrain/opr/internal/megdnn_opr_wrapper.h"
+#include "megbrain/opr/io.h"
+#include "megbrain/opr/tensor_manip.h"
+#include "megdnn/dtype.h"
+
+#include "../blob_manager_impl.h"
+#include "../dnn_op_helper.h"
+#include "../op_trait.h"
+
+namespace mgb {
+namespace imperative {
+namespace {
+namespace padding {
+auto apply_on_var_node(const OpDef& def, const VarNodeArray& inputs) {
+    auto&& op = static_cast<const Padding&>(def);
+    mgb_assert(inputs.size() == 1);
+    return opr::Padding::make(inputs[0], op.param());
+}
+
+SmallVector<TensorPtr> apply_on_physical_tensor(
+        const OpDef& def, const SmallVector<TensorPtr>& inputs,
+        SmallVector<LogicalTensorDesc>& output_descs, const bool& validated) {
+    auto comp_node = inputs[0]->comp_node();
+    auto&& op_def = def.cast_final_safe<Padding>();
+
+    DnnOprCaller<megdnn::Padding> dnn_op(comp_node);
+    dnn_op.op->param() = op_def.param();
+
+    TensorLayout dst = output_descs[0].layout;
+    if (!validated) {
+        megdnn::Padding::deduce_layout_impl(
+                inputs[0]->dnn_tensor().layout, dst, op_def.param());
+    }
+
+    DeviceTensorND out =
+            BlobManager::inst()->alloc_workspace_with_defrag(comp_node, dst);
+
+    dnn_op.op->exec(inputs[0]->dnn_tensor(), out.as_megdnn());
+
+    return {Tensor::make(out)};
+}
+
+std::tuple<SmallVector<LogicalTensorDesc>, bool> infer_output_attrs_fallible(
+        const OpDef& def, const SmallVector<LogicalTensorDesc>& inputs) {
+    auto&& op_def = def.cast_final_safe<Padding>();
+    size_t nr_inp = inputs.size();
+    auto p = op_def.param();
+
+    auto&& inp = inputs[0];
+    auto& inp_cn = inp.comp_node;
+
+    if (inp.layout.ndim == 0) {
+        return {{{TensorLayout{inp.layout.dtype}, inp_cn, {}}}, false};
+    }
+
+    TensorLayout oup_layout;
+    megdnn::Padding::deduce_layout_impl(inp.layout, oup_layout, p);
+    return {{{oup_layout, inp_cn, {}}}, true};
+}
+
+OP_TRAIT_REG(Padding, Padding, opr::Padding)
+        .apply_on_var_node(apply_on_var_node)
+        .apply_on_physical_tensor(apply_on_physical_tensor)
+        .infer_output_attrs_fallible(infer_output_attrs_fallible)
+        .fallback();
+
+}  // namespace padding
+}  // namespace
+}  // namespace imperative
+}  // namespace mgb
+
+// vim: syntax=cpp.doxygen foldmethod=marker foldmarker=f{{{,f}}}
\ No newline at end of file

imperative/src/impl/ops/specializations.cpp

@@ -664,15 +664,6 @@ OP_TRAIT_REG(Cumsum, Cumsum).apply_on_var_node(apply_on_var_node).fallback();
 }  // namespace cumsum
 }  // namespace
 
-namespace padding {
-auto apply_on_var_node(const OpDef& def, const VarNodeArray& inputs) {
-    auto&& op = static_cast<const Padding&>(def);
-    mgb_assert(inputs.size() == 1);
-    return opr::Padding::make(inputs[0], op.param());
-}
-OP_TRAIT_REG(Padding, Padding).apply_on_var_node(apply_on_var_node).fallback();
-}  // namespace padding
-
 namespace lrn {
 auto apply_on_var_node(const OpDef& def, const VarNodeArray& inputs) {
     auto&& op = static_cast<const LRN&>(def);