Restore 0.1.5 version from stash

wolai-backend/.venv312/Lib/site-packages/pgvector/peewee/halfvec.py

@@ -0,0 +1,34 @@
+from peewee import Expression, Field
+from ..utils import HalfVector
+
+
+class HalfVectorField(Field):
+    field_type = 'halfvec'
+
+    def __init__(self, dimensions=None, *args, **kwargs):
+        self.dimensions = dimensions
+        super(HalfVectorField, self).__init__(*args, **kwargs)
+
+    def get_modifiers(self):
+        return self.dimensions and [self.dimensions] or None
+
+    def db_value(self, value):
+        return HalfVector._to_db(value)
+
+    def python_value(self, value):
+        return HalfVector._from_db(value)
+
+    def _distance(self, op, vector):
+        return Expression(lhs=self, op=op, rhs=self.to_value(vector))
+
+    def l2_distance(self, vector):
+        return self._distance('<->', vector)
+
+    def max_inner_product(self, vector):
+        return self._distance('<#>', vector)
+
+    def cosine_distance(self, vector):
+        return self._distance('<=>', vector)
+
+    def l1_distance(self, vector):
+        return self._distance('<+>', vector)