Removed missing references.

src/mixins/__init__.py

@@ -1,31 +1,4 @@
-from .debuggable import DebuggableMixin
-from .multiprocessingable import MultiprocessingMixin
-from .saveable import SaveableMixin
 from .seedable import SeedableMixin
-from .swapcacheable import SwapcacheableMixin
 from .timeable import TimeableMixin
 
-__all__ = [
-    "DebuggableMixin",
-    "MultiprocessingMixin",
-    "SaveableMixin",
-    "SeedableMixin",
-    "SwapcacheableMixin",
-    "TimeableMixin",
-]
-
-# Tensorable and Tqdmable rely on packages that may or may not be installed.
-
-try:
-    from .tensorable import TensorableMixin  # noqa
-
-    __all__.append("TensorableMixin")
-except ImportError:
-    pass
-
-try:
-    from .tqdmable import TQDMableMixin  # noqa
-
-    __all__.append("TQDMableMixin")
-except ImportError:
-    pass
+__all__ = ["SeedableMixin", "TimeableMixin"]