new symbol interface

include/mxnet/atomic_symbol.h

@@ -28,12 +28,12 @@ class AtomicSymbol {
    */
   virtual ~AtomicSymbol() {}
   /*! \brief get the descriptions of inputs for this symbol */
-  virtual std::vector<std::string> DescribeArguments() const {
+  virtual std::vector<std::string> ListArguments() const {
     // default implementation returns "data"
     return std::vector<std::string>(1, std::string("data"));
   }
   /*! \brief get the descriptions of outputs for this symbol */
-  virtual std::vector<std::string> DescribeReturns() const {
+  virtual std::vector<std::string> ListReturns() const {
     // default implementation returns "output"
     return std::vector<std::string>(1, std::string("output"));
   }
@@ -77,6 +77,13 @@ class AtomicSymbol {
    */
   virtual std::string TypeString() const = 0;
   friend class Symbol;
+
+  /*!
+   * \brief create atomic symbol by type name
+   * \param type_name the type string of the AtomicSymbol
+   * \return a new constructed AtomicSymbol
+   */
+  static AtomicSymbol *Create(const char* type_name);
 };
 
 }  // namespace mxnet

include/mxnet/c_api.h

@@ -209,13 +209,21 @@ MXNET_DLL int MXFuncInvoke(FunctionHandle fun,
 // Part 3: symbolic configuration generation
 //--------------------------------------------
 /*!
- * \brief create symbol from config
- * \param cfg configuration string
- * \param out created symbol handle
+ * \brief list all the available AtomicSymbolEntry
+ * \param out_size the size of returned array
+ * \param out_array the output AtomicSymbolCreator array
  * \return 0 when success, -1 when failure happens
  */
-MXNET_DLL int MXSymbolCreateFromConfig(const char *cfg,
-                                       SymbolHandle *out);
+MXNET_DLL int MXSymbolListAtomicSymbolCreators(mx_uint *out_size,
+                                               AtomicSymbolCreator **out_array);
+/*!
+ * \brief Get the name of AtomicSymbol.
+ * \param creator the AtomicSymbolCreator
+ * \param out the returned name of the creator
+ * \return 0 when success, -1 when failure happens
+ */
+MXNET_DLL int MXSymbolGetAtomicSymbolName(AtomicSymbolCreator creator,
+                                          const char **out);
 /*!
  * \brief create Symbol by wrapping AtomicSymbol
  * \param creator the AtomicSymbolCreator
@@ -231,50 +239,79 @@ MXNET_DLL int MXSymbolCreateFromAtomicSymbol(AtomicSymbolCreator creator,
                                              const char **vals,
                                              SymbolHandle *out);
 /*!
- * \brief free the symbol handle
+ * \brief Create a Variable Symbol.
+ * \param name name of the variable
+ * \param out pointer to the created symbol handle
+ * \return 0 when success, -1 when failure happens
+ */
+MXNET_DLL int MXSymbolCreateVariable(const char *name, SymbolHandle *out);
+/*!
+ * \brief Create symbol from config.
+ * \param cfg configuration string
+ * \param out created symbol handle
+ * \return 0 when success, -1 when failure happens
+ */
+MXNET_DLL int MXSymbolCreateFromConfig(const char *cfg,
+                                       SymbolHandle *out);
+/*!
+ * \brief Free the symbol handle.
  * \param symbol the symbol
  * \return 0 when success, -1 when failure happens
  */
 MXNET_DLL int MXSymbolFree(SymbolHandle symbol);
 /*!
- * \brief list all the available AtomicSymbolEntry
- * \param out_size the size of returned array
- * \param out_array the output AtomicSymbolCreator array
+ * \brief Copy the symbol to another handle
+ * \param symbol the source symbol
+ * \param out used to hold the result of copy
  * \return 0 when success, -1 when failure happens
  */
-MXNET_DLL int MXSymbolListAtomicSymbolCreators(mx_uint *out_size,
-                                               AtomicSymbolCreator **out_array);
+MXNET_DLL int MXSymbolCopy(SymbolHandle symbol, SymbolHandle *out);
 /*!
- * \brief get the singleton Symbol of the AtomicSymbol if any
- * \param creator the AtomicSymbolCreator
- * \param out the returned singleton Symbol of the AtomicSymbol the creator stands for
+ * \brief Print the content of symbol, used for debug.
+ * \param symbol the symbol
+ * \param out_str pointer to hold the output string of the printing.
  * \return 0 when success, -1 when failure happens
  */
-MXNET_DLL int MXSymbolGetSingleton(AtomicSymbolCreator creator,
-                                   SymbolHandle *out);
+MXNET_DLL int MXSymbolPrint(SymbolHandle symbol, const char **out_str);
 /*!
- * \brief get the singleton Symbol of the AtomicSymbol if any
- * \param creator the AtomicSymbolCreator
- * \param out the returned name of the creator
+ * \brief List arguments in the symbol.
+ * \param symbol the symbol
+ * \param out_size output size
+ * \param out_str_array pointer to hold the output string array
  * \return 0 when success, -1 when failure happens
  */
-MXNET_DLL int MXSymbolGetAtomicSymbolName(AtomicSymbolCreator creator,
-                                          const char **out);
+MXNET_DLL int MXSymbolListArguments(SymbolHandle symbol,
+                                    mx_uint *out_size,
+                                    const char ***out_str_array);
 /*!
- * \brief compose the symbol on other symbol
+ * \brief List returns in the symbol.
+ * \param symbol the symbol
+ * \param out_size output size
+ * \param out_str_array pointer to hold the output string array
+ * \return 0 when success, -1 when failure happens
+ */
+MXNET_DLL int MXSymbolListReturns(SymbolHandle symbol,
+                                    mx_uint *out_size,
+                                    const char ***out_str_array);
+/*!
+ * \brief Compose the symbol on other symbols.
+ *
+ *  This function will change the sym hanlde.
+ *  To achieve function apply behavior, copy the symbol first
+ *  before apply.
+ *
  * \param sym the symbol to apply
+ * \param name the name of symbol
  * \param num_args number of arguments
  * \param keys the key of keyword args (optional)
  * \param args arguments to sym
- * \param out the resulting symbol
  * \return 0 when success, -1 when failure happens
  */
 MXNET_DLL int MXSymbolCompose(SymbolHandle sym,
+                              const char *name,
                               mx_uint num_args,
                               const char** keys,
-                              SymbolHandle* args,
-                              SymbolHandle* out);
-
+                              SymbolHandle* args);
 //--------------------------------------------
 // Part 4: operator interface on NArray
 //--------------------------------------------

include/mxnet/registry.h

@@ -229,31 +229,16 @@ struct AtomicSymbolEntry {
   std::string name;
   /*! \brief function body to create AtomicSymbol */
   Creator body;
-  /*! \brief singleton is created when no param is needed for the AtomicSymbol */
-  Symbol *singleton_symbol;
   /*! \brief constructor */
   explicit AtomicSymbolEntry(const std::string& name)
-      : use_param(true), name(name), body(NULL), singleton_symbol(NULL) {}
-  /*!
-   * \brief set if param is needed by this AtomicSymbol
-   */
-  inline AtomicSymbolEntry &set_use_param(bool use_param) {
-    this->use_param = use_param;
-    return *this;
-  }
+      : use_param(true), name(name), body(NULL) {}
   /*!
    * \brief set the function body
    */
   inline AtomicSymbolEntry &set_body(Creator body) {
     this->body = body;
     return *this;
   }
-  /*!
-   * \brief return the singleton symbol
-   */
-  Symbol *GetSingletonSymbol();
-  /*! \brief destructor */
-  ~AtomicSymbolEntry();
   /*!
    * \brief invoke the function
    * \return the created AtomicSymbol

include/mxnet/static_graph.h

@@ -21,39 +21,28 @@ struct StaticGraph {
   /*! \brief Node in static graph */
   struct StaticNode {
     /*! \brief wrapped atomic symbol */
-    AtomicSymbol* sym_;
+    std::unique_ptr<AtomicSymbol> sym;
     /*! \brief name of the node */
-    std::string name_;
+    std::string name;
+    /*! \brief index of output from the source. */
+    int index;
+    /*! \brief output shape for node */
+    std::vector<TShape> in_shape;
+    /*! \brief output shape for node */
+    std::vector<TShape> out_shape;
+    /*! \brief input id for each node */
+    std::vector<int> inputs_index;
+    /*! \brief output id for each node */
+    std::vector<int> outputs_index;
   };
+  /*! \brief head node (need input from outside) */
+  std::vector<int> in_args_node_id;
+  /*! \brief tail node (generate data to outside) */
+  std::vector<int> return_node_id;
   /*! \brief node name to id dictionary */
   std::unordered_map<std::string, int> name_id_map;
   /*! \brief all nodes in the graph */
   std::vector<StaticNode> nodes;
-  /*! \brief output id for each node */
-  std::vector<std::vector<int> > output_index;
-  /*! \brief connected graph for each node */
-  std::vector<std::vector<int> > connected_graph;
-  /*! \brief find node by using name
-   *  \param name node name
-   *  \param sym symbol need to be copied into node
-   *  \return node id
-   */
-  int FindNodeByName(const std::string& name, const AtomicSymbol* sym) {
-    int id = 0;
-    if (name_id_map.find(name) == name_id_map.end()) {
-      name_id_map[name] = name_id_map.size();
-      StaticNode static_node;
-      static_node.sym_ = sym->Copy();
-      static_node.name_ = name;
-      nodes.push_back(static_node);
-      output_index.push_back(std::vector<int>());
-      connected_graph.push_back(std::vector<int>());
-      id = name_id_map.size();
-    } else {
-      id = name_id_map[name];
-    }
-    return id;
-  }
 };
 }  // namespace mxnet
 #endif  // MXNET_STATIC_GRAPH_H_