Accessors in a model specify the locations for the input and output data for the algorithm used in the model. The accessors that need to be defined vary by algorithm.
Accessors consist of domains specified as MDX expressions that define the input or output member components. Each member component is an attribute; for example, the expression {[Television], [DVD], [VCR]} includes three attributes: Television, DVD, and VCR.
Through mapping, when you apply, test, or score a model you tell Data Mining Framework how attributes defined for predictor and external accessor domains built into the model relate to the attributes that the model is run against.
Three mapping methods are available:
Mapping is available only in Advanced mode. For additional information about algorithms and accessors, see Using an Algorithm in the Oracle Essbase Database Administrator's Guide.
Using the Data Mining Wizard to define or execute a test, apply, or scoring task, enter all data mining values as prompted. In Advanced mode, perform the following steps while entering algorithm member expressions for predictor and external accessor domains in the Enter algoritihm parameter and accessor information page.
To map accessors:
In the left pane, select the predictor or external accessor domain node to be mapped.
To set the mapping method, select Mapping details.
To have Data Mining Framework map attributes in the cube based on position, select Mapping by position. This is the default option.
To have Data Mining Framework map member name to member name, select Mapping by name then enter the member expression in the available field.
To have Data Mining Framework map from one member to another, specified in pairs, select Mapping by pair.
In the From text box, enter a member name from the domain expression, in the To text box enter the member name to which the From member is to be mapped, and click Map to add the names to the table.
To map additional members, repeat step a.
To delete a member pair from the table, select the pair and click Remove.
To change a member pair, select the pair, click Edit, change as desired in the From and To text boxes, and click Map to insert the changes to the table.
When finished, select a different domain node to be defined, or click Next to move to the next page.