fix: optional import package

Author: kenya-sk

qxmt/feature_maps/__init__.py

@@ -1,5 +1,12 @@
 from qxmt.feature_maps.base import BaseFeatureMap
 from qxmt.feature_maps.pennylane.base import PennyLaneBaseFeatureMap
-from qxmt.feature_maps.qulacs.base import QulacsBaseFeatureMap
 
-__all__ = ["BaseFeatureMap", "PennyLaneBaseFeatureMap", "QulacsBaseFeatureMap"]
+__all__ = ["BaseFeatureMap", "PennyLaneBaseFeatureMap"]
+
+
+def __getattr__(name: str):
+    if name == "QulacsBaseFeatureMap":
+        from qxmt.feature_maps.qulacs.base import QulacsBaseFeatureMap
+
+        return QulacsBaseFeatureMap
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")

qxmt/kernels/__init__.py

@@ -1,6 +1,5 @@
 from qxmt.kernels.base import BaseKernel
 from qxmt.kernels.pennylane.base import PennyLaneBaseKernel
-from qxmt.kernels.qulacs.base import QulacsBaseKernel
 from qxmt.kernels.sampling import (
     generate_all_observable_states,
     sample_results_to_probs,
@@ -10,8 +9,15 @@
 __all__ = [
     "BaseKernel",
     "PennyLaneBaseKernel",
-    "QulacsBaseKernel",
     "generate_all_observable_states",
     "sample_results_to_probs",
     "validate_sampling_values",
 ]
+
+
+def __getattr__(name: str):
+    if name == "QulacsBaseKernel":
+        from qxmt.kernels.qulacs.base import QulacsBaseKernel
+
+        return QulacsBaseKernel
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")

tests/unit/feature_maps/test_imports.py

@@ -1,6 +1,6 @@
 from qxmt.feature_maps import __all__
 
-EXPECTED_ALL = ["BaseFeatureMap", "PennyLaneBaseFeatureMap", "QulacsBaseFeatureMap"]
+EXPECTED_ALL = ["BaseFeatureMap", "PennyLaneBaseFeatureMap"]
 
 
 def test_all_imports() -> None:

tests/unit/kernels/test_imports.py

@@ -3,7 +3,6 @@
 EXPECTED_ALL = [
     "BaseKernel",
     "PennyLaneBaseKernel",
-    "QulacsBaseKernel",
     "generate_all_observable_states",
     "sample_results_to_probs",
     "validate_sampling_values",