maybe fix setup.py ModuleNotFoundError: No module named 'numpy'

by lazy-importing numpy

pyproject.toml

@@ -48,12 +48,7 @@ find = { include = ["chgnet*"], exclude = ["tests", "tests*"] }
 "chgnet.pretrained" = ["*", "**/*"]
 
 [build-system]
-requires = [
-    "Cython",
-    "setuptools>=65",
-    "wheel",
-    "numpy>=2.0.0",
-]
+requires = ["Cython", "numpy>=2", "setuptools>=65", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [tool.ruff]

setup.py

@@ -1,12 +1,19 @@
 from __future__ import annotations
 
-import numpy as np
 from setuptools import Extension, setup
 
 ext_modules = [Extension("chgnet.graph.cygraph", ["chgnet/graph/cygraph.pyx"])]
 
+
+def lazy_numpy_include() -> str:
+    """Get the numpy include directory lazily."""
+    import numpy as np
+
+    return np.get_include()
+
+
 setup(
     ext_modules=ext_modules,
     setup_requires=["Cython"],
-    include_dirs=[np.get_include()],
+    include_dirs=[lazy_numpy_include()],
 )