Make tests more reproducible by seeding based on test paths

tests/conftest.py

@@ -1,12 +1,37 @@
+import hashlib
 import random
 
+import pytest
 import torch
 
 
-def pytest_configure():
-    _set_random_seed(42)
+def pytest_collectstart(collector):
+    if isinstance(collector, pytest.Module):
+        _set_random_seed(_hash(collector.name))
+
+
+@pytest.fixture(scope="module", autouse=True)
+def set_seed_per_module(request):
+    _set_random_seed(_hash(_module_path_from_request(request)))
+
+
+@pytest.fixture(autouse=True)
+def set_seed_per_test(request):
+    _set_random_seed(_hash(_test_case_path_from_request(request)))
 
 
 def _set_random_seed(seed):
     random.seed(seed)
     torch.manual_seed(seed)
+
+
+def _test_case_path_from_request(request):
+    return f"{_module_path_from_request(request)}::{request.node.name}"
+
+
+def _module_path_from_request(request):
+    return f"{request.module.__name__.replace('.', '/')}.py"
+
+
+def _hash(string):
+    return int(hashlib.sha256(string.encode("utf-8")).hexdigest(), 16) % 2**32