Theta base builder. More...
#include <theta_update_sketch_base.hpp>
Inheritance diagram for theta_base_builder< Derived, Allocator >:
Public Member Functions | |
| theta_base_builder (const Allocator &allocator) | |
| Creates and instance of the builder with default parameters. More... | |
| Derived & | set_lg_k (uint8_t lg_k) |
| Set log2(k), where k is a nominal number of entries in the sketch. More... | |
| Derived & | set_resize_factor (resize_factor rf) |
| Set resize factor for the internal hash table (defaults to 8) More... | |
| Derived & | set_p (float p) |
| Set sampling probability (initial theta). More... | |
| Derived & | set_seed (uint64_t seed) |
| Set the seed for the hash function. More... | |
Detailed Description
template<typename Derived, typename Allocator>
class datasketches::theta_base_builder< Derived, Allocator >
Theta base builder.
Constructor & Destructor Documentation
◆ theta_base_builder()
| theta_base_builder | ( | const Allocator & | allocator | ) |
Creates and instance of the builder with default parameters.
- Parameters
-
allocator instance of an Allocator to pass to created sketches
Member Function Documentation
◆ set_lg_k()
| Derived & set_lg_k | ( | uint8_t | lg_k | ) |
Set log2(k), where k is a nominal number of entries in the sketch.
- Parameters
-
lg_k base 2 logarithm of nominal number of entries
- Returns
- this builder
◆ set_resize_factor()
| Derived & set_resize_factor | ( | resize_factor | rf | ) |
Set resize factor for the internal hash table (defaults to 8)
- Parameters
-
rf resize factor
- Returns
- this builder
◆ set_p()
| Derived & set_p | ( | float | p | ) |
Set sampling probability (initial theta).
The default is 1, so the sketch retains all entries until it reaches the limit, at which point it goes into the estimation mode and reduces the effective sampling probability (theta) as necessary.
- Parameters
-
p sampling probability
- Returns
- this builder
◆ set_seed()
| Derived & set_seed | ( | uint64_t | seed | ) |
Set the seed for the hash function.
Should be used carefully if needed. Sketches produced with different seed are not compatible and cannot be mixed in set operations.
- Parameters
-
seed hash seed
- Returns
- this builder
The documentation for this class was generated from the following files:
- theta/include/theta_update_sketch_base.hpp
- theta/include/theta_update_sketch_base_impl.hpp
