Merge pull request #28 from serengil/feat-task-0510-warning-message-f…

…or-addition-of-tensors-with-different-signs

warning message addedfor addition of different signs in tensors

lightphe/models/Tensor.py

@@ -1,6 +1,9 @@
 from typing import Union, List
 from lightphe.models.Homomorphic import Homomorphic
 from lightphe.commons import phe_utils
+from lightphe.commons.logger import Logger
+
+logger = Logger(module="lightphe/models/Tensor.py")
 
 
 # pylint: disable=too-few-public-methods, no-else-return
@@ -174,6 +177,12 @@ def __add__(self, other: "EncryptedTensor") -> "EncryptedTensor":
  else:
  # if one is positive and one is negative, then i cannot know
  # the result is positive or negative. trust mod calculations.
+ if alpha_tensor.sign != beta_tensor.sign:
+ logger.warn(
+ f"{i}-th items of the vectors have different signs, and result's sign "
+ "cannot be determined in PHE. Result will be shown for positive for this anyway."
+ )
+
  current_tensor = Fraction(
  dividend=current_dividend,
  abs_dividend=current_dividend,