Zeroes out extremely large values for robustness to data corruption on
clients, clips to moderately high norm for robustness to outliers. After
weighting in mean, the weighted values are summed using cryptographic protocol
ensuring that the server cannot see individual updates until sufficient number
of updates have been added together. For details, see Bonawitz et al. (2017)
https://dl.acm.org/doi/abs/10.1145/3133956.3133982. In TFF, this is realized
using the tff.federated_secure_sum operator.
Whether to enable adaptive zeroing for data corruption mitigation.
Whether to enable adaptive clipping in the L2 norm for robustness.
Note this clipping is performed prior to the per-coordinate clipping
required for secure aggregation.