Package ai.vespa.models.evaluation

Class FunctionEvaluator

java.lang.Object

ai.vespa.models.evaluation.FunctionEvaluator

public class FunctionEvaluator
extends Object

An evaluator which can be used to evaluate a single function once.

Author:

bratseth

Method Summary

Modifier and Type	Method	Description
FunctionEvaluator	bind(String name, double value)	Binds the given variable referred in this expression to the given value.
FunctionEvaluator	bind(String name, com.yahoo.tensor.Tensor value)	Binds the given variable referred in this expression to the given value.
FunctionEvaluator	bind(String name, String value)	Binds the given variable referred in this expression to the given value.
LazyArrayContext	context()
com.yahoo.tensor.Tensor	evaluate()
com.yahoo.searchlib.rankingexpression.ExpressionFunction	function()	Returns the function evaluated by this
FunctionEvaluator	setMissingValue(double value)	Sets the default value to use for variables which are not bound
FunctionEvaluator	setMissingValue(com.yahoo.tensor.Tensor value)	Sets the default value to use for variables which are not bound

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

bind

public FunctionEvaluator bind(String name,
 com.yahoo.tensor.Tensor value)

Binds the given variable referred in this expression to the given value.

Parameters:

name - the variable to bind

value - the value this becomes bound to

Returns:

this for chaining

bind

public FunctionEvaluator bind(String name,
 double value)

Binds the given variable referred in this expression to the given value. This is equivalent to bind(name, Tensor.Builder.of(TensorType.empty).cell(value).build())

Parameters:

name - the variable to bind

value - the value this becomes bound to

Returns:

this for chaining

bind

public FunctionEvaluator bind(String name,
 String value)

Binds the given variable referred in this expression to the given value. String values are not yet supported in tensors.

Parameters:

name - the variable to bind

value - the value this becomes bound to

Returns:

this for chaining

setMissingValue

public FunctionEvaluator setMissingValue(com.yahoo.tensor.Tensor value)

Sets the default value to use for variables which are not bound

Parameters:

value - the default value

Returns:

this for chaining

setMissingValue

public FunctionEvaluator setMissingValue(double value)

Sets the default value to use for variables which are not bound

Parameters:

value - the default value

Returns:

this for chaining

evaluate

public com.yahoo.tensor.Tensor evaluate()

function

public com.yahoo.searchlib.rankingexpression.ExpressionFunction function()

Returns the function evaluated by this

context

public LazyArrayContext context()