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improve lazy import test (#30733)

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Signed-off-by: Boyuan Feng <boyuan@meta.com>
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Boyuan Feng 2025-12-15 19:12:05 -08:00 committed by GitHub
parent 3bd9c49158
commit c881db364e
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1 changed files with 6 additions and 25 deletions
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31
tests/standalone_tests/lazy_imports.py
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@ -5,9 +5,6 @@
# The utility function cannot be placed in `vllm.utils`
# this needs to be a standalone script
import sys
from contextlib import nullcontext
from vllm_test_utils import BlameResult, blame
# List of modules that should not be imported too early.
# Lazy import `torch._inductor.async_compile` to avoid creating
@ -16,26 +13,10 @@ from vllm_test_utils import BlameResult, blame
# `cv2` can easily mess up the environment.
module_names = ["torch._inductor.async_compile", "cv2"]
# set all modules in `module_names` to be None.
# if we import any modules during `import vllm`, there would be a
# hard error and nice stacktrace on the first import.
for module_name in module_names:
sys.modules[module_name] = None # type: ignore[assignment]
def any_module_imported():
return any(module_name in sys.modules for module_name in module_names)
# In CI, we only check finally if the module is imported.
# If it is indeed imported, we can rerun the test with `use_blame=True`,
# which will trace every function call to find the first import location,
# and help find the root cause.
# We don't run it in CI by default because it is slow.
use_blame = False
context = blame(any_module_imported) if use_blame else nullcontext()
with context as result:
import vllm # noqa
if use_blame:
assert isinstance(result, BlameResult)
print(f"the first import location is:\n{result.trace_stack}")
assert not any_module_imported(), (
f"Some the modules in {module_names} are imported. To see the first"
f" import location, run the test with `use_blame=True`."
)
import vllm # noqa