Table of Contents
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
