def sequence_sum(self, value):
"""Implements `sequence_sum` as defined in `api/intrinsics.py`.
Args:
value: As in `api/intrinsics.py`.
Returns:
As in `api/intrinsics.py`.
Raises:
TypeError: As in `api/intrinsics.py`.
"""
value = value_impl.to_value(value, None, self._context_stack)
if isinstance(value.type_signature, computation_types.SequenceType):
element_type = value.type_signature.element
else:
py_typecheck.check_type(value.type_signature,
computation_types.FederatedType)
py_typecheck.check_type(value.type_signature.member,
computation_types.SequenceType)
element_type = value.type_signature.member.element
if not type_utils.is_sum_compatible(element_type):
raise TypeError(
'The value type {} is not compatible with the sum operator.'.
format(value.type_signature.member))
if isinstance(value.type_signature, computation_types.SequenceType):
value = value_impl.ValueImpl.get_comp(value)
return computation_constructing_utils.create_sequence_sum(value)
elif isinstance(value.type_signature, computation_types.FederatedType):
intrinsic_type = computation_types.FunctionType(
value.type_signature.member,
value.type_signature.member.element)
intrinsic = computation_building_blocks.Intrinsic(
intrinsic_defs.SEQUENCE_SUM.uri, intrinsic_type)
intrinsic_impl = value_impl.ValueImpl(intrinsic,
self._context_stack)
if value.type_signature.placement is placements.SERVER:
return self.federated_apply(intrinsic_impl, value)
elif value.type_signature.placement is placements.CLIENTS:
return self.federated_map(intrinsic_impl, value)
else:
raise TypeError('Unsupported placement {}.'.format(
value.type_signature.placement))
else:
raise TypeError(
'Cannot apply `tff.sequence_sum()` to a value of type {}.'.
format(value.type_signature))
def test_returns_federated_sum(self):
value_type = computation_types.SequenceType(tf.int32)
value = computation_building_blocks.Data('v', value_type)
comp = computation_constructing_utils.create_sequence_sum(value)
self.assertEqual(comp.tff_repr, 'sequence_sum(v)')
self.assertEqual(str(comp.type_signature), 'int32')
def test_raises_type_error_with_none_value(self):
with self.assertRaises(TypeError):
computation_constructing_utils.create_sequence_sum(None)