Use defaultdict in graph/rewriting/basic.py

pytensor/graph/rewriting/basic.py

@@ -10,7 +10,7 @@ import sys
 import time
 import traceback
 import warnings
-from collections import UserList, defaultdict, deque
+from collections import Counter, UserList, defaultdict, deque
 from collections.abc import Callable, Iterable, Sequence
 from collections.abc import Iterable as IterableType
 from functools import _compose_mro, partial, reduce  # type: ignore
@@ -1153,8 +1153,8 @@ class OpToRewriterTracker:
     r"""A container that maps `NodeRewriter`\s to `Op` instances and `Op`-type inheritance."""
 
     def __init__(self):
-        self.tracked_instances: dict[Op, list[NodeRewriter]] = {}
-        self.tracked_types: dict[type, list[NodeRewriter]] = {}
+        self.tracked_instances: dict[Op, list[NodeRewriter]] = defaultdict(list)
+        self.tracked_types: dict[type, list[NodeRewriter]] = defaultdict(list)
         self.untracked_rewrites: list[NodeRewriter] = []
 
     def add_tracker(self, rw: NodeRewriter):
@@ -1166,9 +1166,9 @@ class OpToRewriterTracker:
         else:
             for c in tracks:
                 if isinstance(c, type):
-                    self.tracked_types.setdefault(c, []).append(rw)
+                    self.tracked_types[c].append(rw)
                 else:
-                    self.tracked_instances.setdefault(c, []).append(rw)
+                    self.tracked_instances[c].append(rw)
 
     def _find_impl(self, cls) -> list[NodeRewriter]:
         r"""Returns the `NodeRewriter`\s that apply to `cls` based on inheritance.
@@ -1250,22 +1250,16 @@ class SequentialNodeRewriter(NodeRewriter):
 
         self.profile = profile
         if self.profile:
-            self.time_rewrites: dict[Rewriter, float] = {}
-            self.process_count: dict[Rewriter, int] = {}
-            self.applied_true: dict[Rewriter, int] = {}
-            self.node_created: dict[Rewriter, int] = {}
+            self.time_rewrites: dict[Rewriter, float] = defaultdict(float)
+            self.process_count: dict[Rewriter, int] = Counter()
+            self.applied_true: dict[Rewriter, int] = Counter()
+            self.node_created: dict[Rewriter, int] = Counter()
 
         self.tracker = OpToRewriterTracker()
 
         for o in self.rewrites:
             self.tracker.add_tracker(o)
 
-            if self.profile:
-                self.time_rewrites.setdefault(o, 0.0)
-                self.process_count.setdefault(o, 0)
-                self.applied_true.setdefault(o, 0)
-                self.node_created.setdefault(o, 0)
-
     def __str__(self):
         return getattr(
             self,
@@ -2316,7 +2310,7 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
         changed = True
         max_use_abort = False
         rewriter_name = None
-        global_process_count = {}
+        global_process_count = Counter()
         start_nb_nodes = len(fgraph.apply_nodes)
         max_nb_nodes = len(fgraph.apply_nodes)
         max_use = max_nb_nodes * self.max_use_ratio
@@ -2324,22 +2318,21 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
         loop_timing = []
         loop_process_count = []
         global_rewriter_timing = []
-        time_rewriters = {}
+        time_rewriters = defaultdict(float)
         io_toposort_timing = []
         nb_nodes = []
-        node_created = {}
+        node_created = Counter()
         global_sub_profs = []
         final_sub_profs = []
         cleanup_sub_profs = []
-        for rewriter in (
-            self.global_rewriters
-            + list(self.get_node_rewriters())
-            + self.final_rewriters
-            + self.cleanup_rewriters
-        ):
-            global_process_count.setdefault(rewriter, 0)
-            time_rewriters.setdefault(rewriter, 0)
-            node_created.setdefault(rewriter, 0)
+
+        for rewriter in [
+            *self.global_rewriters,
+            *self.get_node_rewriters(),
+            *self.final_rewriters,
+            *self.cleanup_rewriters,
+        ]:
+            time_rewriters[rewriter] += 0
 
         def apply_cleanup(profs_dict):
             changed = False
@@ -2351,7 +2344,6 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
                 time_rewriters[crewriter] += time.perf_counter() - t_rewrite
                 profs_dict[crewriter].append(sub_prof)
                 if change_tracker.changed:
-                    process_count.setdefault(crewriter, 0)
                     process_count[crewriter] += 1
                     global_process_count[crewriter] += 1
                     changed = True
@@ -2359,7 +2351,7 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
             return changed
 
         while changed and not max_use_abort:
-            process_count = {}
+            process_count = Counter()
             t0 = time.perf_counter()
             changed = False
             iter_cleanup_sub_profs = {}
@@ -2376,7 +2368,6 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
                 time_rewriters[grewrite] += time.perf_counter() - t_rewrite
                 sub_profs.append(sub_prof)
                 if change_tracker.changed:
-                    process_count.setdefault(grewrite, 0)
                     process_count[grewrite] += 1
                     global_process_count[grewrite] += 1
                     changed = True
@@ -2431,7 +2422,6 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
                         time_rewriters[node_rewriter] += time.perf_counter() - t_rewrite
                         if not node_rewriter_change:
                             continue
-                        process_count.setdefault(node_rewriter, 0)
                         process_count[node_rewriter] += 1
                         global_process_count[node_rewriter] += 1
                         changed = True
@@ -2459,7 +2449,6 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
                 time_rewriters[grewrite] += time.perf_counter() - t_rewrite
                 sub_profs.append(sub_prof)
                 if change_tracker.changed:
-                    process_count.setdefault(grewrite, 0)
                     process_count[grewrite] += 1
                     global_process_count[grewrite] += 1
                     changed = True
@@ -2514,7 +2503,7 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
             (start_nb_nodes, end_nb_nodes, max_nb_nodes),
             global_rewriter_timing,
             nb_nodes,
-            time_rewriters,
+            dict(time_rewriters),
             io_toposort_timing,
             node_created,
             global_sub_profs,
@@ -2597,14 +2586,7 @@ class EquilibriumGraphRewriter(NodeProcessingGraphRewriter):
         count_rewrite = []
         not_used = []
         not_used_time = 0
-        process_count = {}
-        for o in (
-            rewrite.global_rewriters
-            + list(rewrite.get_node_rewriters())
-            + list(rewrite.final_rewriters)
-            + list(rewrite.cleanup_rewriters)
-        ):
-            process_count.setdefault(o, 0)
+        process_count = Counter()
         for count in loop_process_count:
             for o, v in count.items():
                 process_count[o] += v