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from peewee import Expression, Field
from ..utils import SparseVector
class SparseVectorField(Field):
field_type = 'sparsevec'
def __init__(self, dimensions=None, *args, **kwargs):
self.dimensions = dimensions
super(SparseVectorField, self).__init__(*args, **kwargs)
def get_modifiers(self):
return self.dimensions and [self.dimensions] or None
def db_value(self, value):
return SparseVector._to_db(value)
def python_value(self, value):
return SparseVector._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)
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