[BUGFIX] Fix quantized_op + requantize + dequantize fuse

src/operator/quantization/quantize_graph_pass.cc

@@ -287,6 +287,7 @@ Graph QuantizeGraph(Graph &&src) {
   static const auto& need_requantize_map = Op::GetAttr<mxnet::FNeedRequantize>("FNeedRequantize");
   static const auto& avoid_quantize_input_map =
       Op::GetAttr<mxnet::FAvoidQuantizeInput>("FAvoidQuantizeInput");
+  static const auto& flist_inputs = nnvm::Op::GetAttr<nnvm::FListOutputNames>("FListInputNames");
   const auto offline_params = src.GetAttr<std::unordered_set<std::string>>("offline_params");
   const auto quantized_dtype = src.GetAttr<std::string>("quantized_dtype");
   const auto quantize_granularity = src.GetAttr<std::string>("quantize_granularity");
@@ -346,7 +347,13 @@ Graph QuantizeGraph(Graph &&src) {
               std::string name = GetOutputName(e.node.get(), e.index);
               suffix = "_" + name;
             } else if (!offline_params.count(new_name)) {
-              new_name = node->attrs.name + "_" + e.node->attrs.name;
+              std::string input_name;
+              if (flist_inputs.count(node->op())) {
+                input_name = flist_inputs[node->op()](node->attrs)[i];
+                new_name = node->attrs.name + "_" + input_name;
+              } else {
+                new_name = node->attrs.name + "_" + e.node->attrs.name;
+              }
             }
 
             ObjectPtr quantize_node = InsertNode("_contrib_quantize_v2",
@@ -504,20 +511,33 @@ Graph QuantizeGraph(Graph &&src) {
   static const auto& need_calib_output_map =
       Op::GetAttr<mxnet::FNeedCalibrateOutput>("FNeedCalibrateOutput");
 
-  std::stack<std::string> calib_variables;
+  std::unordered_set<nnvm::ObjectPtr> calib_variables;
   std::vector<std::string> calib_nodes;
   DFSVisit(ret.outputs, [&](const ObjectPtr& node) {
     if (node->op() && !calib_variables.empty()) {
-      if (reverse_mirror_map.count(node)) {
-          const std::string& var_name = calib_variables.top();
-          const auto& fp32_in_node = reverse_mirror_map[node];
-          for (const auto &input_node : fp32_in_node->inputs) {
-            if (var_name == input_node.node->attrs.name) {
-              calib_nodes.push_back(fp32_in_node->attrs.name + "_" + var_name);
-              calib_variables.pop();
-              break;
+      // find nodes where input is variable node
+      // and add proper input_name to calib_nodes
+      for (int i = 0; i < node->inputs.size(); i++) {
+        const auto &input_node = node->inputs[i];
+        if (calib_variables.find(input_node.node) != std::end(calib_variables)) {
+          auto fp32_node = std::find_if(std::begin(quantized_node_map),
+                                        std::end(quantized_node_map),
+                                        [&](const std::pair<ObjectPtr, ObjectPtr> &pair) {
+                                              return pair.second == node;
+                                          });
+          if (fp32_node != std::end(quantized_node_map)) {
+            const auto& fp32_in_node = fp32_node->first;
+            std::string node_input_name;
+            if (flist_inputs.count(fp32_in_node->op())) {
+              std::string op_input_name = flist_inputs[fp32_in_node->op()](fp32_in_node->attrs)[i];
+              node_input_name = fp32_in_node->attrs.name + "_" + op_input_name;
+            } else {
+              node_input_name = fp32_in_node->attrs.name + "_" + input_node.node->attrs.name;
             }
+            calib_nodes.push_back(node_input_name);
+            calib_variables.erase(input_node.node);
           }
+        }
       }
     }
     if (need_calib_input_map.count(node->op())) {
@@ -530,10 +550,13 @@ Graph QuantizeGraph(Graph &&src) {
         } else {
           const auto& e = node->inputs[idx];
           if (e.node->is_variable()) {
-            // monitor callback join operator name and variable name as observable node,
-            // utilize fact that we're using DFS and put variable name on stack to
-            // find operator node name for this variable node
-            calib_variables.emplace(e.node->attrs.name);
+            // monitor callback join operator name and variable name as observable node name,
+            // instead of using variable output we can use op node input
+            //
+            //                  data_output/fc_input
+            // e.g. data (var.) ----------------------> FC (op)
+            // remember current node and compare with inputs of next nodes
+            calib_variables.insert(node);
           } else {
             if (reverse_mirror_map.count(e.node)) {
               const auto& fp32_in_node = reverse_mirror_map.at(e.node);

src/operator/quantization/quantized_elemwise_mul.cc

@@ -32,14 +32,6 @@ namespace op {
 
 DMLC_REGISTER_PARAMETER(QuantizeElemwiseMulParam);
 
-static std::vector<std::string> QuantizedElemwiseMulOutputNames(const NodeAttrs &attrs) {
-  const QuantizeElemwiseMulParam& params = nnvm::get<QuantizeElemwiseMulParam>(attrs.parsed);
-  if (params.enable_float_output)
-    return std::vector<std::string>{"output"};
-  else
-    return std::vector<std::string>{"output", "min_output", "max_output"};
-}
-
 inline bool QuantizedElemwiseMulOpShape(const nnvm::NodeAttrs& attrs,
                                         mxnet::ShapeVector *in_attrs,
                                         mxnet::ShapeVector *out_attrs) {
@@ -228,7 +220,6 @@ NNVM_REGISTER_OP(_contrib_quantized_elemwise_mul)
   [](const NodeAttrs& attrs) {
     return std::vector<std::string>{"lhs", "rhs", "lhs_min", "lhs_max", "rhs_min", "rhs_max"};
   })
-.set_attr<nnvm::FListOutputNames>("FListOutputNames", QuantizedElemwiseMulOutputNames)
 .set_attr<mxnet::FInferShape>("FInferShape", QuantizedElemwiseMulOpShape)
 .set_attr<nnvm::FInferType>("FInferType", QuantizedElemwiseMulOpType)
 .set_attr<FInferStorageType>("FInferStorageType", QuantizedElemwiseMulOpStorageType)

src/operator/subgraph/mkldnn/mkldnn_elemwisemul_post_quantize_property.h

@@ -28,6 +28,7 @@
 #define MXNET_OPERATOR_SUBGRAPH_MKLDNN_MKLDNN_ELEMWISEMUL_POST_QUANTIZE_PROPERTY_H_
 #if MXNET_USE_ONEDNN == 1
 
+#include <memory>
 #include <string>
 #include <vector>
 #include "../../tensor/elemwise_binary_op-inl.h"
@@ -40,7 +41,7 @@ namespace op {
 
 #define QUANTIZED_ElemwiseMul_NAME "_contrib_quantized_elemwise_mul"
 
-class ElemwiseMulPostQuantizeSelector : public SubgraphSelector {
+class ElemwiseMulPostQuantizeSelector : public SubgraphSelectorV2 {
  public:
   /*! \brief pattern match status */
   enum SelectStatus {
@@ -54,16 +55,17 @@ class ElemwiseMulPostQuantizeSelector : public SubgraphSelector {
   bool disable_all;
   bool disable_float_output;
   SelectStatus status;
-  std::vector<const nnvm::Node *> matched_list;
+  std::vector<const BiDirectedNode *> matched_list;
 
  public:
   explicit ElemwiseMulPostQuantizeSelector(const bool dis_all,
                                            const bool dis_float_output)
       : disable_all(dis_all),
         disable_float_output(dis_float_output) {}
 
-  bool Select(const nnvm::Node &n) override {
-    if ((!disable_all) && n.op() == Op::Get(QUANTIZED_ElemwiseMul_NAME)) {
+  bool Select(const BiDirectedNode &n) override {
+    const auto rawnode = n.node;
+    if ((!disable_all) && rawnode->op() == Op::Get(QUANTIZED_ElemwiseMul_NAME)) {
       status = disable_all ? kSuccess : kStart;
       matched_list.clear();
       matched_list.push_back(&n);
@@ -72,12 +74,14 @@ class ElemwiseMulPostQuantizeSelector : public SubgraphSelector {
     return false;
   }
 
-  bool SelectInput(const nnvm::Node &n, const nnvm::Node &new_node) override {
+  bool SelectInput(const BiDirectedNode &n, const BiDirectedNode &new_node) override {
     return false;
   }
 
-  bool SelectOutput(const nnvm::Node &n, const nnvm::Node &new_node) override {
-    if (status == kFail || status == kSuccess || new_node.is_variable())
+  bool SelectOutput(const BiDirectedNode &n, const BiDirectedNode &new_node) override {
+    const auto raw_node = n.node;
+    const auto raw_new_node = new_node.node;
+    if (status == kFail || status == kSuccess || raw_new_node->is_variable())
       return false;
     // If n isn't the last matched node, then we encoutered a internal
     // branch, we should pop out the node behind n and stop fusion.
@@ -95,8 +99,8 @@ class ElemwiseMulPostQuantizeSelector : public SubgraphSelector {
 
     switch (status) {
       case kStart:
-        if (new_node.op() == Op::Get("_contrib_requantize")) {
-          auto const &param = nnvm::get<RequantizeParam>(new_node.attrs.parsed);
+        if (raw_new_node->op() == Op::Get("_contrib_requantize")) {
+          auto const &param = nnvm::get<RequantizeParam>(raw_new_node->attrs.parsed);
           if (param.min_calib_range.has_value() &&
               param.max_calib_range.has_value()) {
             matched_list.push_back(&new_node);
@@ -105,7 +109,20 @@ class ElemwiseMulPostQuantizeSelector : public SubgraphSelector {
           }
         }
       case kRequantize:
-        if ((!disable_float_output) && (new_node.op() == Op::Get("_contrib_dequantize"))) {
+        if ((!disable_float_output) && (raw_new_node->op() == Op::Get("_contrib_dequantize"))) {
+            CHECK(raw_node->op() == Op::Get("_contrib_requantize"));
+            if (n.outputs.size() > 1) {
+              // check if requantize have other outputs than dequantize
+              // if it has we can't fuse dequantize into elemwise_mul
+              for (auto kv : n.outputs) {
+                const auto& node = kv.first;
+                if (node->op() != Op::Get("_contrib_dequantize")) {
+                  status = kSuccess;
+                  return false;
+                }
+              }
+            }
+
             matched_list.push_back(&new_node);
             status = kSuccess;
             return true;
@@ -116,14 +133,14 @@ class ElemwiseMulPostQuantizeSelector : public SubgraphSelector {
     }
   }
 
-  std::vector<nnvm::Node *> Filter(
-      const std::vector<nnvm::Node *> &candidates) override {
+  std::vector<BiDirectedNode *> Filter(
+      const std::vector<BiDirectedNode *>& candidates) override {
     if ((status != kSuccess) || (matched_list.size() <= 1)) {
-      return std::vector<nnvm::Node *>(0);
+      return std::vector<BiDirectedNode *>(0);
     } else {
-      std::vector<nnvm::Node *> ret;
+      std::vector<BiDirectedNode *> ret;
       for (auto i : matched_list) {
-        auto non_const_i = const_cast<nnvm::Node *>(i);
+        auto non_const_i = const_cast<BiDirectedNode *>(i);
         if (std::find(candidates.begin(), candidates.end(), non_const_i) !=
             candidates.end()) {
           ret.push_back(non_const_i);
@@ -194,7 +211,7 @@ class ElemwiseMulPostQuantizeProperty : public SubgraphProperty {
     return em_node;
   }
 
-  SubgraphSelectorPtr CreateSubgraphSelector() const override {
+  SubgraphSelectorV2Ptr CreateSubgraphSelectorV2() const override {
     auto selector =
         std::make_shared<ElemwiseMulPostQuantizeSelector>(disable_fuse_all,
                                                           disable_float_output);

src/operator/subgraph/mkldnn/mkldnn_fc_post_quantize_property.h

@@ -28,6 +28,7 @@
 #define MXNET_OPERATOR_SUBGRAPH_MKLDNN_MKLDNN_FC_POST_QUANTIZE_PROPERTY_H_
 #if MXNET_USE_ONEDNN == 1
 
+#include <memory>
 #include <string>
 #include <vector>
 #include "../../nn/fully_connected-inl.h"
@@ -40,7 +41,7 @@ namespace op {
 
 #define QUANTIZED_FC_NAME "_sg_mkldnn_fully_connected"
 
-class SgMKLDNNFCPostQuantizeSelector : public SubgraphSelector {
+class SgMKLDNNFCPostQuantizeSelector : public SubgraphSelectorV2 {
  public:
   /*! \brief pattern match status */
   enum SelectStatus {
@@ -54,16 +55,17 @@ class SgMKLDNNFCPostQuantizeSelector : public SubgraphSelector {
   bool disable_all;
   bool disable_float_output;
   SelectStatus status;
-  std::vector<const nnvm::Node *> matched_list;
+  std::vector<const BiDirectedNode *> matched_list;
 
  public:
   explicit SgMKLDNNFCPostQuantizeSelector(const bool dis_all,
                                           const bool dis_float_output)
       : disable_all(dis_all),
         disable_float_output(dis_float_output) {}
 
-  bool Select(const nnvm::Node &n) override {
-    if ((!disable_all) && n.op() == Op::Get(QUANTIZED_FC_NAME)) {
+  bool Select(const BiDirectedNode &n) override {
+    const auto rawnode = n.node;
+    if ((!disable_all) && rawnode->op() == Op::Get(QUANTIZED_FC_NAME)) {
       status = disable_all ? kSuccess : kStart;
       matched_list.clear();
       matched_list.push_back(&n);
@@ -72,12 +74,14 @@ class SgMKLDNNFCPostQuantizeSelector : public SubgraphSelector {
     return false;
   }
 
-  bool SelectInput(const nnvm::Node &n, const nnvm::Node &new_node) override {
+  bool SelectInput(const BiDirectedNode &n, const BiDirectedNode &new_node) override {
     return false;
   }
 
-  bool SelectOutput(const nnvm::Node &n, const nnvm::Node &new_node) override {
-    if (status == kFail || status == kSuccess || new_node.is_variable())
+  bool SelectOutput(const BiDirectedNode &n, const BiDirectedNode &new_node) override {
+    const auto raw_node = n.node;
+    const auto raw_new_node = new_node.node;
+    if (status == kFail || status == kSuccess || raw_new_node->is_variable())
       return false;
     // If n isn't the last matched node, then we encoutered a internal
     // branch, we should pop out the node behind n and stop fusion.
@@ -95,8 +99,8 @@ class SgMKLDNNFCPostQuantizeSelector : public SubgraphSelector {
 
     switch (status) {
       case kStart:
-        if (new_node.op() == Op::Get("_contrib_requantize")) {
-          auto const &param = nnvm::get<RequantizeParam>(new_node.attrs.parsed);
+        if (raw_new_node->op() == Op::Get("_contrib_requantize")) {
+          auto const &param = nnvm::get<RequantizeParam>(raw_new_node->attrs.parsed);
           if (param.min_calib_range.has_value() &&
               param.max_calib_range.has_value()) {
             matched_list.push_back(&new_node);
@@ -105,7 +109,19 @@ class SgMKLDNNFCPostQuantizeSelector : public SubgraphSelector {
           }
         }
       case kRequantize:
-        if ((!disable_float_output) && (new_node.op() == Op::Get("_contrib_dequantize"))) {
+        if ((!disable_float_output) && (raw_new_node->op() == Op::Get("_contrib_dequantize"))) {
+            CHECK(raw_node->op() == Op::Get("_contrib_requantize"));
+            if (n.outputs.size() > 1) {
+              // check if requantize have other outputs than dequantize
+              // if it has we can't fuse dequantize into FC
+              for (auto kv : n.outputs) {
+                const auto& node = kv.first;
+                if (node->op() != Op::Get("_contrib_dequantize")) {
+                  status = kSuccess;
+                  return false;
+                }
+              }
+            }
             matched_list.push_back(&new_node);
             status = kSuccess;
             return true;
@@ -116,14 +132,14 @@ class SgMKLDNNFCPostQuantizeSelector : public SubgraphSelector {
     }
   }
 
-  std::vector<nnvm::Node *> Filter(
-      const std::vector<nnvm::Node *> &candidates) override {
+  std::vector<BiDirectedNode *> Filter(
+      const std::vector<BiDirectedNode *>& candidates) override {
     if ((status != kSuccess) || (matched_list.size() <= 1)) {
-      return std::vector<nnvm::Node *>(0);
+      return std::vector<BiDirectedNode *>(0);
     } else {
-      std::vector<nnvm::Node *> ret;
+      std::vector<BiDirectedNode *> ret;
       for (auto i : matched_list) {
-        auto non_const_i = const_cast<nnvm::Node *>(i);
+        auto non_const_i = const_cast<BiDirectedNode *>(i);
         if (std::find(candidates.begin(), candidates.end(), non_const_i) !=
             candidates.end()) {
           ret.push_back(non_const_i);
@@ -194,7 +210,7 @@ class SgMKLDNNFCPostQuantizeProperty : public SubgraphProperty {
     return fc_node;
   }
 
-  SubgraphSelectorPtr CreateSubgraphSelector() const override {
+  SubgraphSelectorV2Ptr CreateSubgraphSelectorV2() const override {
     auto selector =
         std::make_shared<SgMKLDNNFCPostQuantizeSelector>(disable_fuse_all,
                                                          disable_float_output);

src/operator/subgraph/mkldnn/mkldnn_fc_property.h

@@ -40,7 +40,7 @@ namespace op {
 
 class SgMKLDNNFCSelector : public SubgraphSelector {
  public:
-  /*! \brief pattern match status */
+  /* pattern match status */
   enum SelectStatus {
     kFail = 0,
     kStart,

tests/python/mkl/subgraphs/test_fc_subgraph.py

@@ -163,3 +163,27 @@ def hybrid_forward(self, F, x, weight, bias):
   out_quantized = qnet(data_nd)
   assert_almost_equal_with_err(out.asnumpy(), out_quantized.asnumpy(),
                                rtol=1e-2, atol=1e-2, etol=0.01)
+
+
+@pytest.mark.parametrize('data_shape', DATA_SHAPE)
+def test_fc_int8_and_fp32_outputs(data_shape):
+
+#                 /---> Quantizable op
+# Input ---> FC -|
+#                 \---> Non quantizable op
+
+  class MultiOutputFC(nn.HybridBlock):
+    def __init__(self, **kwargs):
+      super(MultiOutputFC, self).__init__(**kwargs)
+      self.dense0 = nn.Dense(64)
+      self.dense1 = nn.Dense(64)
+
+    def hybrid_forward(self, F, x):
+      x = self.dense0(x)
+      y = self.dense1(x) # quantizable
+      z = F.softmax(x)   # non quantizable
+      return y + z
+
+  attrs = {'fc': {}}
+  net = MultiOutputFC()
+  check_fusion(net, data_shape, attrs, check_quantization=True)