Allow dispatcher decorator without a namenx-sparse

- Name is taken from the decorated function
- Raise error if backend doesn't implement a decorated function which is called
- Check for duplicate names for dispatching algorithms

1 files changed, 3 insertions, 3 deletions

diff --git a/networkx/algorithms/isolate.py b/networkx/algorithms/isolate.py
index d59a46c4..0a077177 100644
--- a/networkx/algorithms/isolate.py
+++ b/networkx/algorithms/isolate.py
@@ -6,7 +6,7 @@ import networkx as nx
 __all__ = ["is_isolate", "isolates", "number_of_isolates"]
 
 
-@nx.dispatch("is_isolate")
+@nx.dispatch
 def is_isolate(G, n):
     """Determines whether a node is an isolate.
 
@@ -39,7 +39,7 @@ def is_isolate(G, n):
     return G.degree(n) == 0
 
 
-@nx.dispatch("isolates")
+@nx.dispatch
 def isolates(G):
     """Iterator over isolates in the graph.
 
@@ -85,7 +85,7 @@ def isolates(G):
     return (n for n, d in G.degree() if d == 0)
 
 
-@nx.dispatch("number_of_isolates")
+@nx.dispatch
 def number_of_isolates(G):
     """Returns the number of isolates in the graph.