subtract_pytorch_tensor

Engine.subtract_pytorch_tensor(x, y)
Returns a ciphertext that represents the result of subtracting two inputs. Does not consume any level.
  • Input:
    • x: torch.Tensor | Ciphertext
    • y: torch.Tensor | Ciphertext
    • x and y must be passed as positional arguments.
    • If x is a Ciphertext, y must be a PyTorch tensor and vice versa.
  • Output:
    • Ciphertext

Warning

  • The matrix form does not yet support this operation.
import torch

from desilofhe import Engine

engine = Engine()
secret_key = engine.create_secret_key()
public_key = engine.create_public_key(secret_key)

message = [1, 2, 3]
ciphertext = engine.encrypt(message, public_key)

tensor = torch.tensor([4, 6, 8])

subtracted1 = engine.subtract_pytorch_tensor(ciphertext, tensor)  # [-3, -4, -5]
subtracted2 = engine.subtract_pytorch_tensor(tensor, ciphertext)  # [ 3,  4,  5]