diff --git a/requirements.txt b/requirements.txt
index 6239d0d90..fc79635f5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,6 +16,7 @@ tqdm
 usort
 parameterized
 PyYAML
+psutil
 
 # for tests
 # https://github.com/pytorch/pytorch/blob/b96b1e8cff029bb0a73283e6e7f6cc240313f1dc/requirements.txt#L3
diff --git a/torchrec/distributed/mc_modules.py b/torchrec/distributed/mc_modules.py
index 54b54d5a1..2dfc8f0a1 100644
--- a/torchrec/distributed/mc_modules.py
+++ b/torchrec/distributed/mc_modules.py
@@ -13,7 +13,17 @@
 import math
 from collections import defaultdict, OrderedDict
 from dataclasses import dataclass
-from typing import Any, DefaultDict, Dict, Iterator, List, Optional, Type, Union
+from typing import (
+    Any,
+    Callable,
+    DefaultDict,
+    Dict,
+    Iterator,
+    List,
+    Optional,
+    Type,
+    Union,
+)
 
 import torch
 import torch.distributed as dist
@@ -58,6 +68,7 @@
     ShardingType,
 )
 from torchrec.distributed.utils import append_prefix
+from torchrec.modules.embedding_configs import BaseEmbeddingConfig
 from torchrec.modules.mc_modules import ManagedCollisionCollection
 from torchrec.modules.utils import construct_jagged_tensors
 from torchrec.sparse.jagged_tensor import JaggedTensor, KeyedJaggedTensor
@@ -215,6 +226,9 @@ def __init__(
 
         self._feature_to_table: Dict[str, str] = module._feature_to_table
         self._table_to_features: Dict[str, List[str]] = module._table_to_features
+        self._table_name_to_config: Dict[str, BaseEmbeddingConfig] = (
+            module._table_name_to_config
+        )
         self._has_uninitialized_input_dists: bool = True
         self._input_dists: List[nn.Module] = []
         self._managed_collision_modules = nn.ModuleDict()
@@ -223,6 +237,9 @@ def __init__(
         self._create_output_dists()
         self._use_index_dedup = use_index_dedup
         self._initialize_torch_state()
+        self.post_lookup_tracker_fn: Optional[
+            Callable[[KeyedJaggedTensor, torch.Tensor], None]
+        ] = None
 
     def _initialize_torch_state(self) -> None:
         self._model_parallel_mc_buffer_name_to_sharded_tensor = OrderedDict()
@@ -732,6 +749,17 @@ def compute(
                     mc_input = mcm.remap(mc_input)
                     mc_input = self.global_to_local_index(mc_input)
                     output.update(mc_input)
+                    if hasattr(
+                        mcm,
+                        "_hash_zch_identities",
+                    ):
+                        if self.post_lookup_tracker_fn is not None:
+                            self.post_lookup_tracker_fn(
+                                KeyedJaggedTensor.from_jt_dict(mc_input),
+                                mcm._hash_zch_identities.index_select(
+                                    dim=0, index=mc_input[table].values()
+                                ),
+                            )
                 values = torch.cat([jt.values() for jt in output.values()])
             else:
                 table: str = tables[0]
@@ -750,6 +778,12 @@ def compute(
                 mc_input = mcm.remap(mc_input)
                 mc_input = self.global_to_local_index(mc_input)
                 values = mc_input[table].values()
+                if hasattr(mcm, "_hash_zch_identities"):
+                    if self.post_lookup_tracker_fn is not None:
+                        self.post_lookup_tracker_fn(
+                            KeyedJaggedTensor.from_jt_dict(mc_input),
+                            mcm._hash_zch_identities.index_select(dim=0, index=values),
+                        )
 
             remapped_kjts.append(
                 KeyedJaggedTensor(
@@ -840,6 +874,24 @@ def sharded_parameter_names(self, prefix: str = "") -> Iterator[str]:
     def unsharded_module_type(self) -> Type[ManagedCollisionCollection]:
         return ManagedCollisionCollection
 
+    def register_post_lookup_tracker_fn(
+        self,
+        record_fn: Callable[[KeyedJaggedTensor, torch.Tensor], None],
+    ) -> None:
+        """
+        Register a function to be called after lookup is done. This is used for
+        tracking the lookup results and optimizer states.
+
+        Args:
+            record_fn (Callable[[KeyedJaggedTensor, torch.Tensor], None]): A custom record function to be called after lookup is done.
+
+        """
+        if self.post_lookup_tracker_fn is not None:
+            logger.warning(
+                "[ModelDeltaTracker] Custom record function already defined, overriding with new callable"
+            )
+        self.post_lookup_tracker_fn = record_fn
+
 
 class ManagedCollisionCollectionSharder(
     BaseEmbeddingSharder[ManagedCollisionCollection]
diff --git a/torchrec/distributed/utils.py b/torchrec/distributed/utils.py
index f2dbefa91..b255f6239 100644
--- a/torchrec/distributed/utils.py
+++ b/torchrec/distributed/utils.py
@@ -781,7 +781,8 @@ def modify_input_for_feature_processor(
 
         if is_collection:
             if hasattr(feature_processors, "pre_process_pipeline_input"):
-                feature_processors.pre_process_pipeline_input(features)  # pyre-ignore[29]
+                # pyre-ignore[29]
+                feature_processors.pre_process_pipeline_input(features)
             else:
                 logging.info(
                     f"[Feature Processor Pipeline] Skipping pre_process_pipeline_input for feature processor {feature_processors=}"
diff --git a/torchrec/modules/mc_modules.py b/torchrec/modules/mc_modules.py
index 39cb2a847..54f0c671e 100644
--- a/torchrec/modules/mc_modules.py
+++ b/torchrec/modules/mc_modules.py
@@ -357,9 +357,11 @@ def __init__(
             len(features) for features in self._table_to_features.values()
         ]
 
-        table_to_config = {config.name: config for config in embedding_configs}
+        self._table_name_to_config: Dict[str, BaseEmbeddingConfig] = {
+            config.name: config for config in embedding_configs
+        }
 
-        for name, config in table_to_config.items():
+        for name, config in self._table_name_to_config.items():
             if name not in managed_collision_modules:
                 raise ValueError(
                     f"Table {name} is not present in managed_collision_modules"