optuna.distributions.IntLogUniformDistribution

class optuna.distributions.IntLogUniformDistribution(low, high, step=1)

A uniform distribution on integers in the log domain.

This object is instantiated by suggest_int(), and passed to samplers in general.

low

Lower endpoint of the range of the distribution. low is included in the range.

high

Upper endpoint of the range of the distribution. high is included in the range.

step

A step for spacing between values.

Warning

Deprecated in v2.0.0. step argument will be removed in the future. The removal of this feature is currently scheduled for v4.0.0, but this schedule is subject to change.

Samplers and other components in Optuna relying on this distribution will ignore this value and assume that step is always 1. User-defined samplers may continue to use other values besides 1 during the deprecation.

Raises

ValueError – If low value is larger than high value, or low value is smaller than 1.

Parameters

• low (int) –

• high (int) –

• step (int) –

Methods

single()	Test whether the range of this distribution contains just a single value.
to_external_repr(param_value_in_internal_repr)	Convert internal representation of a parameter value into external representation.
to_internal_repr(param_value_in_external_repr)	Convert external representation of a parameter value into internal representation.

Attributes

step

single()

Test whether the range of this distribution contains just a single value.

Returns

True if the range of this distribution contains just a single value, otherwise False.

Return type

bool

to_external_repr(param_value_in_internal_repr)

Convert internal representation of a parameter value into external representation.

Parameters

param_value_in_internal_repr (float) – Optuna’s internal representation of a parameter value.

Returns

Optuna’s external representation of a parameter value.

Return type

int

to_internal_repr(param_value_in_external_repr)

Convert external representation of a parameter value into internal representation.

Parameters

param_value_in_external_repr (int) – Optuna’s external representation of a parameter value.

Returns

Optuna’s internal representation of a parameter value.

Return type

float