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ThetaSketch Objects

class ThetaSketch()

A sketch for approximate cardinality tracking.

A wrapper class for datasketches.update_theta_sketch which implements merging for updatable theta sketches.

Currently, datasketches only implements merging for compact (read-only) theta sketches.

update

 | update(value)

Update the statistics tracking

Parameters

value : object Value to follow

merge

 | merge(other)

Merge another ThetaSketch with this one, returning a new object

Parameters

other : ThetaSketch Other theta sketch

Returns

new : ThetaSketch New theta sketch with merged statistics

get_result

 | get_result()

Generate a theta sketch

Returns

compact_sketch : datasketches.compact_theta_sketch Read-only compact theta sketch with full statistics.

serialize

 | serialize()

Serialize this object.

Note that serialization only preserves the object approximately.

Returns

msg : bytes Serialized to bytes

deserialize

 | @staticmethod
| deserialize(msg: bytes)

Deserialize from a serialized message.

msg

Parameters

msg : bytes Serialized object. can be a serialized version of:

  • ThetaSketch
  • datasketches.update_theta_sketch,
  • datasketches.compact_theta_sketch

Returns

sketch : ThetaSketch ThetaSketch object

to_summary

 | to_summary(num_std_devs=1)

Generate a summary protobuf message

Parameters

num_std_devs : float For estimating bounds

Returns

summary : UniqueCountSummary Summary protobuf message

numbers_summary

numbers_summary(sketch: ThetaSketch, num_std_devs=1)

Generate a summary protobuf message from a thetasketch based on numeric values

Parameters

sketch

num_std_devs : float For estimating bounds

Returns

summary : UniqueCountSummary Summary protobuf message

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