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tf_privacy.NoPrivacyAverageQuery

Implements DPQuery interface for an average query with no privacy.

Inherits From: SumAggregationDPQuery, DPQuery

Accumulates vectors and normalizes by the total number of accumulated vectors. Under some sampling schemes, such as Poisson subsampling, the number of records in a sample is a private quantity, so we lose all privacy guarantees by using the number of records directly to normalize.

Also allows weighted accumulation, unlike the base class DPQuery. In a private implementation of weighted average, the weight would have to be itself privatized.

Methods

accumulate_preprocessed_record

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Implements tensorflow_privacy.DPQuery.accumulate_preprocessed_record.

accumulate_record

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Implements tensorflow_privacy.DPQuery.accumulate_record.

Optional weight argument allows weighted accumulation.

Args
params The parameters for the sample.
sample_state The current sample state.
record The record to accumulate.
weight Optional weight for the record.

Returns
The updated sample state.

derive_metrics

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Derives metric information from the current global state.

Any metrics returned should be derived only from privatized quantities.

Args
global_state The global state from which to derive metrics.

Returns
A collections.OrderedDict mapping string metric names to tensor values.

derive_sample_params

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Given the global state, derives parameters to use for the next sample.

For example, if the mechanism needs to clip records to bound the norm, the clipping norm should be part of the sample params. In a distributed context, this is the part of the state that would be sent to the workers so they can process records.

Args
global_state The current global state.

Returns
Parameters to use to process records in the next sample.

get_noised_result

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Implements tensorflow_privacy.DPQuery.get_noised_result.

initial_global_state

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Returns the initial global state for the DPQuery.

The global state contains any state information that changes across repeated applications of the mechanism. The default implementation returns just an empty tuple for implementing classes that do not have any persistent state.

Returns
The global state.

initial_sample_state

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Implements tensorflow_privacy.DPQuery.initial_sample_state.

merge_sample_states

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Implements tensorflow_privacy.DPQuery.merge_sample_states.

preprocess_record

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Implements tensorflow_privacy.DPQuery.preprocess_record.

Optional weight argument allows weighted accumulation.

Args
params The parameters for the sample.
record The record to accumulate.
weight Optional weight for the record.

Returns
The preprocessed record.