CPU: Switch to primitive pointers

src/ngraph/runtime/cpu/mkldnn_emitter.cpp

@@ -22,6 +22,12 @@
 
 using namespace ngraph::runtime::cpu;
 
+size_t MKLDNNEmitter::insert_primitive(mkldnn::primitive* primitive)
+{
+    mkldnn_primitives.emplace_back(primitive);
+    return (mkldnn_primitives.size() - 1);
+}
+
 mkldnn::memory::desc MKLDNNEmitter::build_memory_descriptor(const TensorViewWrapper& tvw, mkldnn::memory::format fmt)
 {
     return mkldnn::memory::desc(mkldnn::memory::dims(tvw.get_shape().begin(), tvw.get_shape().end()),
@@ -41,9 +47,11 @@ mkldnn::memory MKLDNNEmitter::build_memory_primitive(const TensorViewWrapper& tv
     return mkldnn::memory({build_memory_descriptor(tvw), mkldnn_utils::global_cpu_engine}, nullptr);
 }
 
-mkldnn::memory MKLDNNEmitter::build_memory_primitive(const mkldnn::memory::desc& desc)
+size_t MKLDNNEmitter::build_memory_primitive(const mkldnn::memory::desc& desc)
 {
-    return mkldnn::memory({desc, mkldnn_utils::global_cpu_engine}, nullptr);
+    return insert_primitive(
+        new mkldnn::memory({desc, mkldnn_utils::global_cpu_engine}, nullptr)
+        );
 }
 
 size_t MKLDNNEmitter::build_convolution_forward(const mkldnn::memory::desc& input_data_desc,
@@ -54,7 +62,12 @@ size_t MKLDNNEmitter::build_convolution_forward(const mkldnn::memory::desc& inpu
                                                 const ngraph::CoordinateDiff& padding_above)
 
 {
-    mkldnn_primitives.push_back(mkldnn::convolution_forward(
+    size_t input_index = build_memory_primitive(input_data_desc);
+    size_t weights_index = build_memory_primitive(weights_desc);
+    size_t result_index =  build_memory_primitive(result_desc);
+
+    size_t conv_index = insert_primitive(
+        new mkldnn::convolution_forward(
         {
             {
                 mkldnn::prop_kind::forward, mkldnn::algorithm::convolution_direct,
@@ -66,9 +79,11 @@ size_t MKLDNNEmitter::build_convolution_forward(const mkldnn::memory::desc& inpu
             },
             mkldnn_utils::global_cpu_engine
         },
-    build_memory_primitive(input_data_desc),
-    build_memory_primitive(weights_desc),
-    build_memory_primitive(result_desc)));
+        *mkldnn_primitives[input_index],
+        *mkldnn_primitives[weights_index],
+        *mkldnn_primitives[result_index])
+        );
 
-    return (mkldnn_primitives.size() - 1);
+    primitive_deps[conv_index] = {input_index, weights_index, result_index};
+    return conv_index;
 }

src/ngraph/runtime/cpu/mkldnn_emitter.hpp

@@ -15,6 +15,7 @@
 #pragma once
 
 #include <memory>
+#include <unordered_map>
 #include <vector>
 
 #include <mkldnn.hpp>
@@ -39,10 +40,11 @@ namespace ngraph
                 }
 
                 // TODO(jmenon): Get rid of TensorViewWrappers at some point
+                size_t insert_primitive(mkldnn::primitive* primitive);
                 mkldnn::memory::desc build_memory_descriptor(const TensorViewWrapper& tvw, mkldnn::memory::format fmt);
                 mkldnn::memory::desc build_memory_descriptor(const TensorViewWrapper& tvw);
                 mkldnn::memory build_memory_primitive(const TensorViewWrapper& tvw);
-                mkldnn::memory build_memory_primitive(const mkldnn::memory::desc& desc);
+                size_t build_memory_primitive(const mkldnn::memory::desc& desc);
 
                 size_t build_convolution_forward(const mkldnn::memory::desc& input_data_desc,
                                                        const mkldnn::memory::desc& weights_desc,
@@ -52,8 +54,9 @@ namespace ngraph
                                                        const ngraph::CoordinateDiff& padding_above);
             private:
                 std::shared_ptr<CPU_ExternalFunction> external_function;
-                std::vector<mkldnn::primitive> mkldnn_primitives;
+                std::vector<mkldnn::primitive*> mkldnn_primitives;
                 std::vector<mkldnn::stream> mkldnn_streams;
+                std::unordered_map<size_t, std::vector<size_t>> primitive_deps;
             };
         }
     }