From 8ca9a0f2c006706f6f0b683e1b8d6c715d6eda86 Mon Sep 17 00:00:00 2001
From: Kartik <kartik.labhshetwar@mem0.ai>
Date: Mon, 3 Aug 2026 20:36:28 +0530
Subject: [PATCH] fix: OSS Python SDK hygiene batch, 9 small bug fixes (#6770)

---
 mem0/embeddings/fastembed.py                  |  6 +-
 mem0/embeddings/huggingface.py                |  2 +-
 mem0/embeddings/ollama.py                     | 14 +---
 mem0/memory/utils.py                          |  8 +-
 mem0/reranker/cohere_reranker.py              |  9 ++-
 mem0/reranker/huggingface_reranker.py         | 14 ++--
 .../reranker/sentence_transformer_reranker.py | 16 ++--
 mem0/reranker/zero_entropy_reranker.py        |  9 ++-
 mem0/utils/factory.py                         |  6 +-
 mem0/vector_stores/mongodb.py                 |  1 -
 mem0/vector_stores/vertex_ai_vector_search.py |  1 -
 .../embeddings/test_huggingface_embeddings.py | 14 +++-
 tests/memory/test_memory_utils.py             | 26 ++++++-
 tests/rerankers/conftest.py                   | 32 ++++++++
 .../test_reranker_fallback_no_mutation.py     | 75 +++++++++++++++++++
 .../rerankers/test_reranker_fallback_topk.py  | 45 +----------
 tests/utils/test_factory.py                   |  9 +++
 17 files changed, 201 insertions(+), 86 deletions(-)
 create mode 100644 tests/rerankers/test_reranker_fallback_no_mutation.py

diff --git a/mem0/embeddings/fastembed.py b/mem0/embeddings/fastembed.py
index fadaedb8c..9434e5089 100644
--- a/mem0/embeddings/fastembed.py
+++ b/mem0/embeddings/fastembed.py
@@ -1,7 +1,7 @@
-from typing import Optional, Literal
+from typing import Literal, Optional
 
-from mem0.embeddings.base import EmbeddingBase
 from mem0.configs.embeddings.base import BaseEmbedderConfig
+from mem0.embeddings.base import EmbeddingBase
 
 try:
     from fastembed import TextEmbedding
@@ -29,4 +29,4 @@ class FastEmbedEmbedding(EmbeddingBase):
         """
         text = text.replace("\n", " ")
         embeddings = list(self.dense_model.embed(text))
-        return embeddings[0]
+        return embeddings[0].tolist()
diff --git a/mem0/embeddings/huggingface.py b/mem0/embeddings/huggingface.py
index 230fb7e20..7e175f36e 100644
--- a/mem0/embeddings/huggingface.py
+++ b/mem0/embeddings/huggingface.py
@@ -17,7 +17,7 @@ class HuggingFaceEmbedding(EmbeddingBase):
         super().__init__(config)
 
         if self.config.huggingface_base_url:
-            self.client = OpenAI(base_url=self.config.huggingface_base_url)
+            self.client = OpenAI(base_url=self.config.huggingface_base_url, api_key=self.config.api_key)
             self.config.model = self.config.model or "tei"
         else:
             self.config.model = self.config.model or "multi-qa-MiniLM-L6-cos-v1"
diff --git a/mem0/embeddings/ollama.py b/mem0/embeddings/ollama.py
index c5a74e36e..55c164f2c 100644
--- a/mem0/embeddings/ollama.py
+++ b/mem0/embeddings/ollama.py
@@ -1,5 +1,3 @@
-import subprocess
-import sys
 from typing import Literal, Optional
 
 from mem0.configs.embeddings.base import BaseEmbedderConfig
@@ -8,17 +6,7 @@ from mem0.embeddings.base import EmbeddingBase
 try:
     from ollama import Client
 except ImportError:
-    user_input = input("The 'ollama' library is required. Install it now? [y/N]: ")
-    if user_input.lower() == "y":
-        try:
-            subprocess.check_call([sys.executable, "-m", "pip", "install", "ollama"])
-            from ollama import Client
-        except subprocess.CalledProcessError:
-            print("Failed to install 'ollama'. Please install it manually using 'pip install ollama'.")
-            sys.exit(1)
-    else:
-        print("The required 'ollama' library is not installed.")
-        sys.exit(1)
+    raise ImportError("The 'ollama' library is required. Please install it using 'pip install ollama'.")
 
 
 class OllamaEmbedding(EmbeddingBase):
diff --git a/mem0/memory/utils.py b/mem0/memory/utils.py
index dd7b1e4cc..b22d60a27 100644
--- a/mem0/memory/utils.py
+++ b/mem0/memory/utils.py
@@ -121,6 +121,8 @@ def remove_code_blocks(content: str) -> str:
     - If a code block is detected, it returns only the inner content, stripping out the markers.
     - If no code block markers are found, the original content is returned as-is.
     """
+    if content is None:
+        return ""
     pattern = r"^```[a-zA-Z0-9]*\n([\s\S]*?)\n```$"
     match = re.match(pattern, content.strip())
     match_res=match.group(1).strip() if match else content.strip()
@@ -213,8 +215,8 @@ def parse_vision_messages(messages, llm=None, vision_details="auto"):
             try:
                 description = get_image_description(image_url, llm, vision_details)
                 returned_messages.append({"role": role, "content": description})
-            except Exception:
-                raise Exception(f"Error while downloading {image_url}.")
+            except Exception as e:
+                raise Exception(f"Error while downloading {image_url}.") from e
         else:
             # Regular text content
             returned_messages.append(msg)
@@ -227,7 +229,7 @@ def process_telemetry_filters(filters):
     Process the telemetry filters
     """
     if filters is None:
-        return {}
+        return [], {}
 
     encoded_ids = {}
     if "user_id" in filters:
diff --git a/mem0/reranker/cohere_reranker.py b/mem0/reranker/cohere_reranker.py
index 281fabcc6..6063ad0a7 100644
--- a/mem0/reranker/cohere_reranker.py
+++ b/mem0/reranker/cohere_reranker.py
@@ -1,6 +1,6 @@
 import logging
 import os
-from typing import List, Dict, Any
+from typing import Any, Dict, List
 
 from mem0.reranker.base import BaseReranker
 
@@ -84,7 +84,10 @@ class CohereReranker(BaseReranker):
         except Exception as e:
             # Fallback to original order if reranking fails
             logger.warning("Cohere reranking failed, falling back to original order: %s", e)
+            fallback_docs = []
             for doc in documents:
-                doc['rerank_score'] = 0.0
+                fallback_doc = doc.copy()
+                fallback_doc['rerank_score'] = 0.0
+                fallback_docs.append(fallback_doc)
             final_top_k = top_k or self.config.top_k
-            return documents[:final_top_k] if final_top_k else documents
\ No newline at end of file
+            return fallback_docs[:final_top_k] if final_top_k else fallback_docs
\ No newline at end of file
diff --git a/mem0/reranker/huggingface_reranker.py b/mem0/reranker/huggingface_reranker.py
index be87d3dba..6af1bee2e 100644
--- a/mem0/reranker/huggingface_reranker.py
+++ b/mem0/reranker/huggingface_reranker.py
@@ -1,14 +1,15 @@
 import logging
-from typing import List, Dict, Any, Union
+from typing import Any, Dict, List, Union
+
 import numpy as np
 
-from mem0.reranker.base import BaseReranker
 from mem0.configs.rerankers.base import BaseRerankerConfig
 from mem0.configs.rerankers.huggingface import HuggingFaceRerankerConfig
+from mem0.reranker.base import BaseReranker
 
 try:
-    from transformers import AutoTokenizer, AutoModelForSequenceClassification
     import torch
+    from transformers import AutoModelForSequenceClassification, AutoTokenizer
     TRANSFORMERS_AVAILABLE = True
 except ImportError:
     TRANSFORMERS_AVAILABLE = False
@@ -163,7 +164,10 @@ class HuggingFaceReranker(BaseReranker):
         except Exception as e:
             # Fallback to original order if reranking fails
             logger.warning("HuggingFace reranking failed, falling back to original order: %s", e)
+            fallback_docs = []
             for doc in documents:
-                doc['rerank_score'] = 0.0
+                fallback_doc = doc.copy()
+                fallback_doc['rerank_score'] = 0.0
+                fallback_docs.append(fallback_doc)
             final_top_k = top_k or self.config.top_k
-            return documents[:final_top_k] if final_top_k else documents
\ No newline at end of file
+            return fallback_docs[:final_top_k] if final_top_k else fallback_docs
\ No newline at end of file
diff --git a/mem0/reranker/sentence_transformer_reranker.py b/mem0/reranker/sentence_transformer_reranker.py
index d891294f1..2b92f3e80 100644
--- a/mem0/reranker/sentence_transformer_reranker.py
+++ b/mem0/reranker/sentence_transformer_reranker.py
@@ -1,10 +1,13 @@
 import logging
-from typing import List, Dict, Any, Union
+from typing import Any, Dict, List, Union
+
 import numpy as np
 
-from mem0.reranker.base import BaseReranker
 from mem0.configs.rerankers.base import BaseRerankerConfig
-from mem0.configs.rerankers.sentence_transformer import SentenceTransformerRerankerConfig
+from mem0.configs.rerankers.sentence_transformer import (
+    SentenceTransformerRerankerConfig,
+)
+from mem0.reranker.base import BaseReranker
 
 try:
     from sentence_transformers import CrossEncoder
@@ -108,7 +111,10 @@ class SentenceTransformerReranker(BaseReranker):
         except Exception as e:
             # Fallback to original order if reranking fails
             logger.warning("SentenceTransformer reranking failed, falling back to original order: %s", e)
+            fallback_docs = []
             for doc in documents:
-                doc['rerank_score'] = 0.0
+                fallback_doc = doc.copy()
+                fallback_doc['rerank_score'] = 0.0
+                fallback_docs.append(fallback_doc)
             final_top_k = top_k or self.config.top_k
-            return documents[:final_top_k] if final_top_k else documents
\ No newline at end of file
+            return fallback_docs[:final_top_k] if final_top_k else fallback_docs
\ No newline at end of file
diff --git a/mem0/reranker/zero_entropy_reranker.py b/mem0/reranker/zero_entropy_reranker.py
index dcf71bfaf..68228c85d 100644
--- a/mem0/reranker/zero_entropy_reranker.py
+++ b/mem0/reranker/zero_entropy_reranker.py
@@ -1,6 +1,6 @@
 import logging
 import os
-from typing import List, Dict, Any
+from typing import Any, Dict, List
 
 from mem0.reranker.base import BaseReranker
 
@@ -95,7 +95,10 @@ class ZeroEntropyReranker(BaseReranker):
         except Exception as e:
             # Fallback to original order if reranking fails
             logger.warning("Zero Entropy reranking failed, falling back to original order: %s", e)
+            fallback_docs = []
             for doc in documents:
-                doc['rerank_score'] = 0.0
+                fallback_doc = doc.copy()
+                fallback_doc['rerank_score'] = 0.0
+                fallback_docs.append(fallback_doc)
             final_top_k = top_k or self.config.top_k
-            return documents[:final_top_k] if final_top_k else documents
\ No newline at end of file
+            return fallback_docs[:final_top_k] if final_top_k else fallback_docs
\ No newline at end of file
diff --git a/mem0/utils/factory.py b/mem0/utils/factory.py
index 866a4da73..30a1079bb 100644
--- a/mem0/utils/factory.py
+++ b/mem0/utils/factory.py
@@ -19,7 +19,9 @@ from mem0.configs.rerankers.base import BaseRerankerConfig
 from mem0.configs.rerankers.cohere import CohereRerankerConfig
 from mem0.configs.rerankers.huggingface import HuggingFaceRerankerConfig
 from mem0.configs.rerankers.llm import LLMRerankerConfig
-from mem0.configs.rerankers.sentence_transformer import SentenceTransformerRerankerConfig
+from mem0.configs.rerankers.sentence_transformer import (
+    SentenceTransformerRerankerConfig,
+)
 from mem0.configs.rerankers.zero_entropy import ZeroEntropyRerankerConfig
 from mem0.embeddings.mock import MockEmbeddings
 
@@ -86,7 +88,7 @@ class LlmFactory:
             config = config_class(**kwargs)
         elif isinstance(config, dict):
             # Merge dict config with kwargs
-            config.update(kwargs)
+            config = {**config, **kwargs}
             config = config_class(**config)
         elif isinstance(config, BaseLlmConfig):
             # Convert base config to provider-specific config if needed
diff --git a/mem0/vector_stores/mongodb.py b/mem0/vector_stores/mongodb.py
index a7738c6f2..53c0b7de6 100644
--- a/mem0/vector_stores/mongodb.py
+++ b/mem0/vector_stores/mongodb.py
@@ -15,7 +15,6 @@ except ImportError:
 from mem0.vector_stores.base import VectorStoreBase
 
 logger = logging.getLogger(__name__)
-logging.basicConfig(level=logging.INFO)
 
 _DRIVER_METADATA = DriverInfo(name="Mem0", version=version("mem0ai"))
 
diff --git a/mem0/vector_stores/vertex_ai_vector_search.py b/mem0/vector_stores/vertex_ai_vector_search.py
index 8ba1ceea7..0954bf90c 100644
--- a/mem0/vector_stores/vertex_ai_vector_search.py
+++ b/mem0/vector_stores/vertex_ai_vector_search.py
@@ -22,7 +22,6 @@ from mem0.configs.vector_stores.vertex_ai_vector_search import (
 from mem0.vector_stores.base import VectorStoreBase
 
 # Configure logging
-logging.basicConfig(level=logging.DEBUG)
 logger = logging.getLogger(__name__)
 
 
diff --git a/tests/embeddings/test_huggingface_embeddings.py b/tests/embeddings/test_huggingface_embeddings.py
index 91f3ffe40..ed2ee61e8 100644
--- a/tests/embeddings/test_huggingface_embeddings.py
+++ b/tests/embeddings/test_huggingface_embeddings.py
@@ -94,7 +94,7 @@ def test_embed_with_huggingface_base_url():
         embedder = HuggingFaceEmbedding(config)
         result = embedder.embed("Hello from custom endpoint")
 
-        mock_openai.assert_called_once_with(base_url="http://localhost:8080")
+        mock_openai.assert_called_once_with(base_url="http://localhost:8080", api_key=None)
         mock_client.embeddings.create.assert_called_once_with(
             input="Hello from custom endpoint",
             model="my-custom-model",
@@ -103,6 +103,18 @@ def test_embed_with_huggingface_base_url():
         assert result == [0.1, 0.2, 0.3]
 
 
+def test_embed_with_huggingface_base_url_forwards_api_key():
+    config = BaseEmbedderConfig(
+        huggingface_base_url="http://localhost:8080",
+        model="my-custom-model",
+        api_key="tei-token",
+    )
+    with patch("mem0.embeddings.huggingface.OpenAI") as mock_openai:
+        HuggingFaceEmbedding(config)
+
+        mock_openai.assert_called_once_with(base_url="http://localhost:8080", api_key="tei-token")
+
+
 def test_embed_batch_sentence_transformer(mock_sentence_transformer):
     config = BaseEmbedderConfig()
     embedder = HuggingFaceEmbedding(config)
diff --git a/tests/memory/test_memory_utils.py b/tests/memory/test_memory_utils.py
index 49c55c5cb..3bab79429 100644
--- a/tests/memory/test_memory_utils.py
+++ b/tests/memory/test_memory_utils.py
@@ -1,9 +1,12 @@
-import pytest
 from unittest.mock import Mock
 
+import pytest
+
 from mem0.memory.utils import (
     parse_messages,
     parse_vision_messages,
+    process_telemetry_filters,
+    remove_code_blocks,
     remove_spaces_from_entities,
     sanitize_relationship_for_cypher,
 )
@@ -114,6 +117,17 @@ class TestParseVisionMessages:
             parse_vision_messages(messages, llm=mock_llm)
         mock_llm.generate_response.assert_not_called()
 
+    def test_download_failure_preserves_original_exception(self):
+        mock_llm = Mock()
+        mock_llm.generate_response.side_effect = ValueError("network down")
+        messages = [
+            {"role": "user", "content": {"type": "image_url", "image_url": {"url": "https://example.com/img.png"}}}
+        ]
+        with pytest.raises(Exception) as exc_info:
+            parse_vision_messages(messages, llm=mock_llm)
+        assert isinstance(exc_info.value.__cause__, ValueError)
+        assert "network down" in str(exc_info.value.__cause__)
+
 
 class TestRemoveSpacesFromEntities:
     """
@@ -168,3 +182,13 @@ class TestRemoveSpacesFromEntities:
         f = remove_spaces_from_entities([dict(base)], sanitize_relationship=False)[0]["relationship"]
         assert t == sanitize_relationship_for_cypher("a/b")
         assert f == "a/b"
+
+
+class TestProcessTelemetryFilters:
+    def test_none_filters_returns_empty_list_and_dict(self):
+        assert process_telemetry_filters(None) == ([], {})
+
+
+class TestRemoveCodeBlocks:
+    def test_none_content_returns_empty_string(self):
+        assert remove_code_blocks(None) == ""
diff --git a/tests/rerankers/conftest.py b/tests/rerankers/conftest.py
index 258d959cb..edae4f581 100644
--- a/tests/rerankers/conftest.py
+++ b/tests/rerankers/conftest.py
@@ -1,3 +1,5 @@
+import sys
+from types import ModuleType
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -9,3 +11,33 @@ def mock_llm():
         mock_llm_instance = MagicMock()
         mock_factory.create.return_value = mock_llm_instance
         yield mock_factory, mock_llm_instance
+
+
+@pytest.fixture
+def mock_cohere(monkeypatch):
+    """Provide a fake ``cohere`` module so CohereReranker imports/constructs."""
+    fake_cohere = ModuleType("cohere")
+    fake_client = MagicMock()
+    fake_cohere.Client = MagicMock(return_value=fake_client)
+    monkeypatch.setitem(sys.modules, "cohere", fake_cohere)
+
+    import mem0.reranker.cohere_reranker as cohere_reranker
+
+    monkeypatch.setattr(cohere_reranker, "cohere", fake_cohere, raising=False)
+    monkeypatch.setattr(cohere_reranker, "COHERE_AVAILABLE", True, raising=False)
+    return cohere_reranker, fake_client
+
+
+@pytest.fixture
+def mock_zero_entropy(monkeypatch):
+    """Provide a fake ``zeroentropy`` module so ZeroEntropyReranker imports."""
+    fake_module = ModuleType("zeroentropy")
+    fake_client = MagicMock()
+    fake_module.ZeroEntropy = MagicMock(return_value=fake_client)
+    monkeypatch.setitem(sys.modules, "zeroentropy", fake_module)
+
+    import mem0.reranker.zero_entropy_reranker as zero_entropy_reranker
+
+    monkeypatch.setattr(zero_entropy_reranker, "ZeroEntropy", fake_module.ZeroEntropy, raising=False)
+    monkeypatch.setattr(zero_entropy_reranker, "ZERO_ENTROPY_AVAILABLE", True, raising=False)
+    return zero_entropy_reranker, fake_client
diff --git a/tests/rerankers/test_reranker_fallback_no_mutation.py b/tests/rerankers/test_reranker_fallback_no_mutation.py
new file mode 100644
index 000000000..3a33ded60
--- /dev/null
+++ b/tests/rerankers/test_reranker_fallback_no_mutation.py
@@ -0,0 +1,75 @@
+"""Regression tests pinning that the reranker fallback path never mutates caller-owned documents."""
+
+from unittest.mock import MagicMock, patch
+
+from mem0.configs.rerankers.cohere import CohereRerankerConfig
+from mem0.configs.rerankers.huggingface import HuggingFaceRerankerConfig
+from mem0.configs.rerankers.sentence_transformer import (
+    SentenceTransformerRerankerConfig,
+)
+from mem0.configs.rerankers.zero_entropy import ZeroEntropyRerankerConfig
+from mem0.reranker.huggingface_reranker import HuggingFaceReranker
+from mem0.reranker.sentence_transformer_reranker import SentenceTransformerReranker
+
+
+def _docs(n):
+    return [{"memory": f"doc{i}"} for i in range(n)]
+
+
+class TestCohereFallbackNoMutation:
+    def test_fallback_does_not_mutate_original_documents(self, mock_cohere):
+        module, fake_client = mock_cohere
+        fake_client.rerank.side_effect = RuntimeError("API error")
+
+        reranker = module.CohereReranker(CohereRerankerConfig(api_key="test-key"))
+        documents = _docs(3)
+        result = reranker.rerank("query", documents)
+
+        assert all("rerank_score" not in doc for doc in documents)
+        assert all(doc["rerank_score"] == 0.0 for doc in result)
+
+
+class TestZeroEntropyFallbackNoMutation:
+    def test_fallback_does_not_mutate_original_documents(self, mock_zero_entropy):
+        module, fake_client = mock_zero_entropy
+        fake_client.models.rerank.side_effect = RuntimeError("API error")
+
+        reranker = module.ZeroEntropyReranker(ZeroEntropyRerankerConfig(api_key="test-key"))
+        documents = _docs(3)
+        result = reranker.rerank("query", documents)
+
+        assert all("rerank_score" not in doc for doc in documents)
+        assert all(doc["rerank_score"] == 0.0 for doc in result)
+
+
+class TestHuggingFaceFallbackNoMutation:
+    def test_fallback_does_not_mutate_original_documents(self):
+        with (
+            patch("mem0.reranker.huggingface_reranker.AutoTokenizer") as mock_tokenizer_cls,
+            patch("mem0.reranker.huggingface_reranker.AutoModelForSequenceClassification") as mock_model_cls,
+        ):
+            mock_tokenizer = MagicMock(side_effect=RuntimeError("tokenizer error"))
+            mock_tokenizer_cls.from_pretrained.return_value = mock_tokenizer
+            mock_model_cls.from_pretrained.return_value = MagicMock()
+
+            reranker = HuggingFaceReranker(HuggingFaceRerankerConfig())
+            documents = _docs(3)
+            result = reranker.rerank("query", documents)
+
+        assert all("rerank_score" not in doc for doc in documents)
+        assert all(doc["rerank_score"] == 0.0 for doc in result)
+
+
+class TestSentenceTransformerFallbackNoMutation:
+    def test_fallback_does_not_mutate_original_documents(self):
+        with patch("mem0.reranker.sentence_transformer_reranker.CrossEncoder") as mock_cross_encoder_cls:
+            mock_model = MagicMock()
+            mock_model.predict.side_effect = RuntimeError("predict error")
+            mock_cross_encoder_cls.return_value = mock_model
+
+            reranker = SentenceTransformerReranker(SentenceTransformerRerankerConfig())
+            documents = _docs(3)
+            result = reranker.rerank("query", documents)
+
+        assert all("rerank_score" not in doc for doc in documents)
+        assert all(doc["rerank_score"] == 0.0 for doc in result)
diff --git a/tests/rerankers/test_reranker_fallback_topk.py b/tests/rerankers/test_reranker_fallback_topk.py
index a2767e8ae..aa6410a32 100644
--- a/tests/rerankers/test_reranker_fallback_topk.py
+++ b/tests/rerankers/test_reranker_fallback_topk.py
@@ -1,52 +1,9 @@
-"""Regression tests for the reranker fallback path honoring ``config.top_k``.
-
-When the underlying rerank call fails, the reranker falls back to returning the
-documents in their original order. That fallback must still respect the
-configured ``top_k`` limit, exactly like the success path does. The HuggingFace
-and SentenceTransformer rerankers already behave this way; these tests pin the
-same contract for the Cohere and ZeroEntropy rerankers.
-"""
-
-import sys
-from types import ModuleType
-from unittest.mock import MagicMock
-
-import pytest
+"""Regression tests pinning that the reranker fallback path still honors ``config.top_k``."""
 
 from mem0.configs.rerankers.cohere import CohereRerankerConfig
 from mem0.configs.rerankers.zero_entropy import ZeroEntropyRerankerConfig
 
 
-@pytest.fixture
-def mock_cohere(monkeypatch):
-    """Provide a fake ``cohere`` module so CohereReranker imports/constructs."""
-    fake_cohere = ModuleType("cohere")
-    fake_client = MagicMock()
-    fake_cohere.Client = MagicMock(return_value=fake_client)
-    monkeypatch.setitem(sys.modules, "cohere", fake_cohere)
-
-    import mem0.reranker.cohere_reranker as cohere_reranker
-
-    monkeypatch.setattr(cohere_reranker, "cohere", fake_cohere, raising=False)
-    monkeypatch.setattr(cohere_reranker, "COHERE_AVAILABLE", True, raising=False)
-    return cohere_reranker, fake_client
-
-
-@pytest.fixture
-def mock_zero_entropy(monkeypatch):
-    """Provide a fake ``zeroentropy`` module so ZeroEntropyReranker imports."""
-    fake_module = ModuleType("zeroentropy")
-    fake_client = MagicMock()
-    fake_module.ZeroEntropy = MagicMock(return_value=fake_client)
-    monkeypatch.setitem(sys.modules, "zeroentropy", fake_module)
-
-    import mem0.reranker.zero_entropy_reranker as zero_entropy_reranker
-
-    monkeypatch.setattr(zero_entropy_reranker, "ZeroEntropy", fake_module.ZeroEntropy, raising=False)
-    monkeypatch.setattr(zero_entropy_reranker, "ZERO_ENTROPY_AVAILABLE", True, raising=False)
-    return zero_entropy_reranker, fake_client
-
-
 def _docs(n):
     return [{"memory": f"doc{i}"} for i in range(n)]
 
diff --git a/tests/utils/test_factory.py b/tests/utils/test_factory.py
index 0f07bd2d5..cbb63890b 100644
--- a/tests/utils/test_factory.py
+++ b/tests/utils/test_factory.py
@@ -51,3 +51,12 @@ def test_base_to_provider_without_reasoning_fields_still_builds():
 
     assert isinstance(built, AnthropicConfig)
     assert built.model == "claude-3-5-sonnet-20240620"
+
+
+def test_dict_config_not_mutated_by_kwargs():
+    config = {"model": "gpt-4o-mini"}
+
+    with patch("mem0.utils.factory.load_class", return_value=Mock(return_value=Mock())):
+        LlmFactory.create("openai", config, api_key="secret")
+
+    assert config == {"model": "gpt-4o-mini"}