[GraphBolt] Rename to CPUFeatureCache and bug fixes. [1]

graphbolt/src/cache_policy.cc

@@ -77,7 +77,9 @@ torch::Tensor BaseCachePolicy::ReplaceImpl(
           const auto pos = pos_optional ? *pos_optional : policy.Insert(key);
           positions_ptr[i] = pos;
           TORCH_CHECK(
-              std::get<1>(position_set.insert(pos)),
+              // If there are duplicate values and the key was just inserted,
+              // we do not have to check for the uniqueness of the positions.
+              pos_optional.has_value() || std::get<1>(position_set.insert(pos)),
               "Can't insert all, larger cache capacity is needed.");
         }
       }));

python/dgl/graphbolt/impl/feature_cache.py

@@ -1,7 +1,7 @@
 """CPU Feature Cache implementation wrapper for graphbolt."""
 import torch
 
-__all__ = ["FeatureCache"]
+__all__ = ["CPUFeatureCache"]
 
 caching_policies = {
     "s3-fifo": torch.ops.graphbolt.s3_fifo_cache_policy,
@@ -11,7 +11,7 @@
 }
 
 
-class FeatureCache(object):
+class CPUFeatureCache(object):
     r"""High level wrapper for the CPU feature cache.
 
     Parameters
@@ -34,15 +34,24 @@ def __init__(
         self,
         cache_shape,
         dtype,
-        policy="sieve",
+        policy=None,
         num_parts=None,
         pin_memory=False,
     ):
+        if policy is None:
+            policy = "sieve"
         assert (
             policy in caching_policies
         ), f"{list(caching_policies.keys())} are the available caching policies."
         if num_parts is None:
             num_parts = torch.get_num_threads()
+        min_num_cache_items = num_parts * (10 if policy == "s3-fifo" else 1)
+        # Since we partition the cache, each partition needs to have a positive
+        # number of slots. In addition, each "s3-fifo" partition needs at least
+        # 10 slots since the small queue is 10% and the small queue needs a
+        # positive size.
+        if cache_shape[0] < min_num_cache_items:
+            cache_shape = (min_num_cache_items,) + cache_shape[1:]
         self._policy = caching_policies[policy](cache_shape[0], num_parts)
         self._cache = torch.ops.graphbolt.feature_cache(
             cache_shape, dtype, pin_memory

tests/python/pytorch/graphbolt/impl/test_feature_cache.py

@@ -29,7 +29,7 @@ def test_feature_cache(dtype, feature_size, num_parts, policy):
         torch.get_num_threads() if num_parts is None else num_parts
     )
     a = torch.randint(0, 2, [1024, feature_size], dtype=dtype)
-    cache = gb.impl.FeatureCache(
+    cache = gb.impl.CPUFeatureCache(
         (cache_size,) + a.shape[1:], a.dtype, policy, num_parts
     )