feat: adding secure loading of models by default for haystack (#3901)

* adding secure loading of models by default

* simplified set function

* testing import effect correctly

* added appropriate log line, adapted the test

* change log string formatting

Co-authored-by: Massimiliano Pippi <mpippi@gmail.com>

* remove extra closing bracket )

Co-authored-by: Julian Risch <julian.risch@deepset.ai>
Co-authored-by: Massimiliano Pippi <mpippi@gmail.com>

haystack/__init__.py

@@ -20,6 +20,8 @@
 from haystack.schema import Document, Answer, Label, MultiLabel, Span, EvaluationResult
 from haystack.nodes.base import BaseComponent
 from haystack.pipelines.base import Pipeline
+from haystack.environment import set_pytorch_secure_model_loading
 
 
 pd.options.display.max_colwidth = 80
+set_pytorch_secure_model_loading()

haystack/environment.py

@@ -1,3 +1,4 @@
+import logging
 import os
 import platform
 import sys
@@ -17,6 +18,18 @@
 
 env_meta_data: Dict[str, Any] = {}
 
+logger = logging.getLogger(__name__)
+
+
+def set_pytorch_secure_model_loading(flag_val="1"):
+    # To load secure only model pytorch requires value of
+    # TORCH_FORCE_WEIGHTS_ONLY_LOAD to be ["1", "y", "yes", "true"]
+    os_flag_val = os.getenv("TORCH_FORCE_WEIGHTS_ONLY_LOAD")
+    if os_flag_val is None:
+        os.environ["TORCH_FORCE_WEIGHTS_ONLY_LOAD"] = flag_val
+    else:
+        logger.info("TORCH_FORCE_WEIGHTS_ONLY_LOAD is already set to %s, Haystack will use the same.", os_flag_val)
+
 
 def get_or_create_env_meta_data() -> Dict[str, Any]:
     """

test/others/test_utils.py

@@ -1,4 +1,6 @@
+import importlib
 import logging
+import os
 from random import random
 from typing import List
 
@@ -12,6 +14,7 @@
 from ..conftest import fail_at_version, haystack_version
 
 from haystack.errors import OpenAIRateLimitError
+from haystack.environment import set_pytorch_secure_model_loading
 from haystack.schema import Answer, Document, Span, Label
 from haystack.utils.deepsetcloud import DeepsetCloud, DeepsetCloudExperiments
 from haystack.utils.labels import aggregate_labels
@@ -1245,6 +1248,17 @@ def greet2(name: str):
     assert greet2("John") == "Hello John"
 
 
+def test_secure_model_loading(monkeypatch, caplog):
+    caplog.set_level(logging.INFO)
+    monkeypatch.setenv("TORCH_FORCE_WEIGHTS_ONLY_LOAD", "0")
+
+    # now testing if just importing haystack is enough to enable secure loading of pytorch models
+    import haystack
+
+    importlib.reload(haystack)
+    assert "already set to" in caplog.text
+
+
 class TestAggregateLabels:
     @pytest.fixture
     def standard_labels(self) -> List[Label]: