chore(misc): print deprecation warning on import

tests/test_velovi.py

@@ -1,7 +1,11 @@
+import pytest
 import scvelo as scv
 from scvi.data import synthetic_iid
 
-from velovi import VELOVI
+
+def test_import():
+    with pytest.warns(UserWarning):
+        pass
 
 
 def test_preprocess_data():
@@ -16,6 +20,8 @@ def test_preprocess_data():
 
 
 def test_velovi():
+    from velovi import VELOVI
+
     n_latent = 5
     adata = synthetic_iid()
     adata.layers["spliced"] = adata.X.copy()

velovi/__init__.py

@@ -1,13 +1,23 @@
 """velovi."""
 
 import logging
+import warnings
 
-from rich.console import Console
-from rich.logging import RichHandler
+# warning has to be at the top level to print on import
+warnings.warn(
+    "The velovi package is no longer being actively developed or maintained as of v0.4.0. Please "
+    "use the implementation in the scvi-tools package instead. For more information, see "
+    "https://github.com/scverse/scvi-tools/issues/2610.",
+    UserWarning,
+    stacklevel=1,
+)
 
-from ._constants import REGISTRY_KEYS
-from ._model import VELOVI, VELOVAE
-from ._utils import get_permutation_scores, preprocess_data
+from rich.console import Console  # noqa
+from rich.logging import RichHandler  # noqa
+
+from ._constants import REGISTRY_KEYS  # noqa
+from ._model import VELOVI, VELOVAE  # noqa
+from ._utils import get_permutation_scores, preprocess_data  # noqa
 
 # https://github.com/python-poetry/poetry/pull/2366#issuecomment-652418094
 # https://github.com/python-poetry/poetry/issues/144#issuecomment-623927302
@@ -35,6 +45,7 @@
 # this prevents double outputs
 logger.propagate = False
 
+
 __all__ = [
     "VELOVI",
     "VELOVAE",