Rename number_of_nodes, number_of_edges to num_nodes, num_edges. (#5486)

* Add num_nodes/num_edges

* additional

* Update python/dgl/graph_index.py
Co-authored-by: Mufei Li <mufeili1996@gmail.com>

* Apply suggestions from code review
Co-authored-by: Mufei Li <mufeili1996@gmail.com>

---------
Co-authored-by: Ubuntu <ubuntu@ip-172-31-28-63.ap-northeast-1.compute.internal>
Co-authored-by: Mufei Li <mufeili1996@gmail.com>

python/dgl/graph_index.py

@@ -161,6 +161,27 @@ class GraphIndex(ObjectBase):
         state = (n_nodes, readonly_state, src, dst)
         self.__setstate__(state)
 
+    def num_nodes(self):
+        """Return the number of nodes.
+
+        Returns
+        -------
+        int
+            The number of nodes.
+        """
+        return _CAPI_DGLGraphNumVertices(self)
+
+    def num_edges(self):
+        """Return the number of edges.
+
+        Returns
+        -------
+        int
+            The number of edges.
+        """
+        return _CAPI_DGLGraphNumEdges(self)
+
+    # TODO(#5485): remove this method.
     def number_of_nodes(self):
         """Return the number of nodes.
 
@@ -171,6 +192,7 @@ class GraphIndex(ObjectBase):
         """
         return _CAPI_DGLGraphNumVertices(self)
 
+    # TODO(#5485): remove this method.
     def number_of_edges(self):
         """Return the number of edges.
 

python/dgl/heterograph_index.py

@@ -359,6 +359,37 @@ class HeteroGraphIndex(ObjectBase):
         """
         return bool(_CAPI_DGLHeteroIsReadonly(self))
 
+    def num_nodes(self, ntype):
+        """Return the number of nodes.
+
+        Parameters
+        ----------
+        ntype : int
+            Node type.
+
+        Returns
+        -------
+        int
+            The number of nodes.
+        """
+        return _CAPI_DGLHeteroNumVertices(self, int(ntype))
+
+    def num_edges(self, etype):
+        """Return the number of edges.
+
+        Parameters
+        ----------
+        etype : int
+            Edge type.
+
+        Returns
+        -------
+        int
+            The number of edges.
+        """
+        return _CAPI_DGLHeteroNumEdges(self, int(etype))
+
+    # TODO(#5485): remove this method.
     def number_of_nodes(self, ntype):
         """Return the number of nodes.
 
@@ -374,6 +405,7 @@ class HeteroGraphIndex(ObjectBase):
         """
         return _CAPI_DGLHeteroNumVertices(self, int(ntype))
 
+    # TODO(#5485): remove this method.
     def number_of_edges(self, etype):
         """Return the number of edges.