class opacus.optimizers.perlayeroptimizer.DPPerLayerOptimizer(optimizer, *, noise_multiplier, max_grad_norm, expected_batch_size, loss_reduction='mean', generator=None, secure_mode=False)[source]

DPOptimizer that implements per layer clipping strategy

  • optimizer (Optimizer) – wrapped optimizer.

  • noise_multiplier (float) – noise multiplier

  • max_grad_norm (List[float]) – max grad norm used for gradient clipping

  • expected_batch_size (Optional[int]) – batch_size used for averaging gradients. When using Poisson sampling averaging denominator can’t be inferred from the actual batch size. Required is loss_reduction="mean", ignored if loss_reduction="sum"

  • loss_reduction (str) – Indicates if the loss reduction (for aggregating the gradients) is a sum or a mean operation. Can take values “sum” or “mean”

  • generator – torch.Generator() object used as a source of randomness for the noise

  • secure_mode (bool) – if True uses noise generation approach robust to floating point arithmetic attacks. See _generate_noise() for details


Performs gradient clipping. Stores clipped and aggregated gradients into p.summed_grad``