diff --git a/requirements.txt b/requirements.txt
index a7e5fa7..0d61bf8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 # Experimaestro
 
-experimaestro>=1.5.0
+experimaestro>=1.5.1
 datamaestro>=1.0.1
 datamaestro_text>=2024.2.29
 ir_datasets
diff --git a/src/xpmir/conversation/learning/__init__.py b/src/xpmir/conversation/learning/__init__.py
index 1cbe147..23eee83 100644
--- a/src/xpmir/conversation/learning/__init__.py
+++ b/src/xpmir/conversation/learning/__init__.py
@@ -1,3 +1,4 @@
+from functools import cached_property
 import numpy as np
 from datamaestro_text.data.ir import TopicRecord
 from datamaestro_text.data.conversation import (
@@ -17,12 +18,16 @@ class DatasetConversationEntrySampler(BaseSampler):
     dataset: Param[ConversationDataset]
     """The conversation dataset"""
 
+    @cached_property
+    def conversations(self):
+        return list(self.dataset.__iter__())
+
     def __iter__(self) -> RandomSerializableIterator[TopicConversationRecord]:
         def generator(random: np.random.RandomState):
             while True:
                 # Pick a random conversation
-                conversation_ix = random.randint(0, len(self.dataset))
-                conversation = self.dataset[conversation_ix]
+                conversation_ix = random.randint(0, len(self.conversations))
+                conversation = self.conversations[conversation_ix]
 
                 # Pick a random topic record entry
                 nodes = [
@@ -33,8 +38,10 @@ def generator(random: np.random.RandomState):
                 node_ix = random.randint(len(nodes))
                 node = nodes[node_ix]
 
-                yield node.entry().add(
+                node = node.entry().add(
                     ConversationHistoryItem(node.history()), no_check=True
                 )
 
+                yield node
+
         return RandomSerializableIterator(self.random, generator)
diff --git a/src/xpmir/conversation/models/cosplade.py b/src/xpmir/conversation/models/cosplade.py
index 81e53d4..0121438 100644
--- a/src/xpmir/conversation/models/cosplade.py
+++ b/src/xpmir/conversation/models/cosplade.py
@@ -19,6 +19,9 @@
 )
 from xpmir.letor.trainers.alignment import AlignmentLoss
 from xpmir.neural.splade import SpladeTextEncoderV2
+from xpmir.utils.logging import easylog
+
+logger = easylog()
 
 
 @define
@@ -109,7 +112,8 @@ def forward(self, records: List[TopicConversationRecord]):
                     )
                     pair_origins.append(ix)
                 elif isinstance(item, AnswerConversationRecord):
-                    answer = item
+                    if (answer := item.get(AnswerEntry)) is None:
+                        logger.warning("Answer record has no answer entry")
                 else:
                     # Ignore anything which is not a pair topic-response
                     answer = None
diff --git a/src/xpmir/evaluation.py b/src/xpmir/evaluation.py
index 4797eac..14b6b56 100644
--- a/src/xpmir/evaluation.py
+++ b/src/xpmir/evaluation.py
@@ -10,7 +10,6 @@
     AdhocAssessments,
     Documents,
     AdhocResults,
-    TextItem,
     IDItem,
 )
 from datamaestro_text.data.ir.trec import TrecAdhocRun, TrecAdhocResults
@@ -73,7 +72,7 @@ def print_line(fp, measure, scope, value):
 def get_run(retriever: Retriever, dataset: Adhoc):
     """Returns the scored documents for each topic in a dataset"""
     results = retriever.retrieve_all(
-        {topic[IDItem].id: topic[TextItem].text for topic in dataset.topics.iter()}
+        {topic[IDItem].id: topic for topic in dataset.topics.iter()}
     )
     return {
         qid: {sd.document[IDItem].id: sd.score for sd in scoredocs}
diff --git a/src/xpmir/utils/iter.py b/src/xpmir/utils/iter.py
index 5a25ba8..d837bfc 100644
--- a/src/xpmir/utils/iter.py
+++ b/src/xpmir/utils/iter.py
@@ -17,7 +17,6 @@
 )
 from xpmir.utils.utils import easylog
 import logging
-import atexit
 
 logger = easylog()
 
@@ -394,22 +393,7 @@ def detach(self):
     def __next__(self):
         # Start a process if needed
         self.start()
-
-        # Get the next element
-        element = self.queue.get()
-
-        # Last element
-        if isinstance(element, StopIterationClass):
-            atexit.unregister(self.kill_subprocess)
-            raise StopIteration()
-
-        # An exception occurred
-        if isinstance(element, Exception):
-            atexit.unregister(self.kill_subprocess)
-            logging.warning("Got an exception in the iteration process")
-            raise RuntimeError("Error in iterator process") from element
-
-        return element
+        return next(self.mp_iterator)
 
 
 class StatefullIterator(Iterator[Tuple[T, State]], Protocol[State]):