use setuptools_scm to retrieve version from github tag

pyproject.toml

@@ -1,5 +1,9 @@
 [build-system]
-requires = ["setuptools>=65", "wheel"]
+requires = [
+    "setuptools>=65", 
+    "setuptools_scm[toml]",
+    "wheel", 
+]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -29,6 +33,7 @@ readme = "README.md"
 keywords = ["Bayesian inference", "simulation-based inference", "PyTorch"]
 dependencies = [
     "arviz",
+    'importlib_metadata; python_version < "3.8"',
     "joblib>=1.0.0",
     "matplotlib",
     "numpy",
@@ -128,8 +133,8 @@ markers = [
     "gpu: marks tests that require a gpu (deselect with '-m \"not gpu\"')"
 ]
 
-[tool.setuptools.dynamic]
-version = {attr = "sbi.__version__"}
+[tool.setuptools_scm]
+write_to = "sbi/_version.py"
 
 [tool.setuptools]
 packages = ["sbi"]

sbi/__init__.py

@@ -1 +1,11 @@
-from sbi.__version__ import __version__  # noqa: F401
+try:
+    from importlib.metadata import PackageNotFoundError, version
+except ImportError:
+    from importlib_metadata import PackageNotFoundError, version
+
+try:
+    # get version from _version.py
+    __version__ = version("sbi")
+except PackageNotFoundError:
+    # If the package is not installed, don't add __version__
+    pass

sbi/_version.py

@@ -0,0 +1,16 @@
+# file generated by setuptools_scm
+# don't change, don't track in version control
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Tuple, Union
+    VERSION_TUPLE = Tuple[Union[int, str], ...]
+else:
+    VERSION_TUPLE = object
+
+version: str
+__version__: str
+__version_tuple__: VERSION_TUPLE
+version_tuple: VERSION_TUPLE
+
+__version__ = version = '0.22.1.dev15+gc1e9977.d20240213'
+__version_tuple__ = version_tuple = (0, 22, 1, 'dev15', 'gc1e9977.d20240213')