Remove unused graph rewriting functionality

doc/extending/graph_rewriting.rst

@@ -134,7 +134,7 @@ computation graph.
 In a nutshell, :class:`ReplaceValidate` grants access to :meth:`fgraph.replace_validate`,
 and :meth:`fgraph.replace_validate` allows us to replace a :class:`Variable` with
 another while respecting certain validation constraints. As an
-exercise, try to rewrite :class:`Simplify` using :class:`NodeFinder`. (Hint: you
+exercise, try to rewrite :class:`Simplify` using :class:`WalkingGraphRewriter`. (Hint: you
 want to use the method it publishes instead of the call to toposort)
 
 Then, in :meth:`GraphRewriter.apply` we do the actual job of simplification. We start by

doc/library/graph/features.rst

@@ -26,7 +26,3 @@ Guide
 .. class:: ReplaceValidate(History, Validator)
 
     .. method:: replace_validate(fgraph, var, new_var, reason=None)
-
-.. class:: NodeFinder(Bookkeeper)
-
-.. class:: PrintListener(object)

pytensor/graph/features.py

@@ -827,100 +827,6 @@ def validate(self, fgraph):
             raise InconsistencyError("Trying to reintroduce a removed node")
 
 
-class NodeFinder(Bookkeeper):
-    def __init__(self):
-        self.fgraph = None
-        self.d = {}
-
-    def on_attach(self, fgraph):
-        if hasattr(fgraph, "get_nodes"):
-            raise AlreadyThere("NodeFinder is already present")
-
-        if self.fgraph is not None and self.fgraph != fgraph:
-            raise Exception("A NodeFinder instance can only serve one FunctionGraph.")
-
-        self.fgraph = fgraph
-        fgraph.get_nodes = partial(self.query, fgraph)
-        Bookkeeper.on_attach(self, fgraph)
-
-    def clone(self):
-        return type(self)()
-
-    def on_detach(self, fgraph):
-        """
-        Should remove any dynamically added functionality
-        that it installed into the function_graph
-        """
-        if self.fgraph is not fgraph:
-            raise Exception(
-                "This NodeFinder instance was not attached to the provided fgraph."
-            )
-        self.fgraph = None
-        del fgraph.get_nodes
-        Bookkeeper.on_detach(self, fgraph)
-
-    def on_import(self, fgraph, node, reason):
-        try:
-            self.d.setdefault(node.op, []).append(node)
-        except TypeError:  # node.op is unhashable
-            return
-        except Exception as e:
-            print("OFFENDING node", type(node), type(node.op), file=sys.stderr)  # noqa: T201
-            try:
-                print("OFFENDING node hash", hash(node.op), file=sys.stderr)  # noqa: T201
-            except Exception:
-                print("OFFENDING node not hashable", file=sys.stderr)  # noqa: T201
-            raise e
-
-    def on_prune(self, fgraph, node, reason):
-        try:
-            nodes = self.d[node.op]
-        except TypeError:  # node.op is unhashable
-            return
-        nodes.remove(node)
-        if not nodes:
-            del self.d[node.op]
-
-    def query(self, fgraph, op):
-        try:
-            all = self.d.get(op, [])
-        except TypeError:
-            raise TypeError(
-                f"{op} in unhashable and cannot be queried by the optimizer"
-            )
-        all = list(all)
-        return all
-
-
-class PrintListener(Feature):
-    def __init__(self, active=True):
-        self.active = active
-
-    def on_attach(self, fgraph):
-        if self.active:
-            print("-- attaching to: ", fgraph)  # noqa: T201
-
-    def on_detach(self, fgraph):
-        """
-        Should remove any dynamically added functionality
-        that it installed into the function_graph
-        """
-        if self.active:
-            print("-- detaching from: ", fgraph)  # noqa: T201
-
-    def on_import(self, fgraph, node, reason):
-        if self.active:
-            print(f"-- importing: {node}, reason: {reason}")  # noqa: T201
-
-    def on_prune(self, fgraph, node, reason):
-        if self.active:
-            print(f"-- pruning: {node}, reason: {reason}")  # noqa: T201
-
-    def on_change_input(self, fgraph, node, i, r, new_r, reason=None):
-        if self.active:
-            print(f"-- changing ({node}.inputs[{i}]) from {r} to {new_r}")  # noqa: T201
-
-
 class PreserveVariableAttributes(Feature):
     """
     This preserve some variables attributes and tag during optimization.