SAP HANA Predictive Analysis Library (PAL)

3.1.10 LDA Estimation and Inference
Latent Dirichlet allocation (LDA) is a generative model in which each item of a collection is modeled as a
distribution over an underlying set of groups (topics). In the context of text modeling, it posits that each
document in the text corpora is composed by several topics with different probabilities and each word belongs
to certain topics with different probabilities. In PAL, the parameter inference is done via Gibbs sampling.
LDAESTIMATE
This function performs LDA estimation.
Procedure Generation
CALL SYS.AFLLANG_WRAPPER_PROCEDURE_CREATE (‘AFLPAL’, ‘LDAESTIMATE’,
‘’, '', );
The signature table should contain the following records:
Table 63:
Position Schema Name Table Type Name Parameter Type
1 IN
2 IN
3
OUT
4
OUT
5
OUT
6
OUT
7
OUT
8
OUT (optional)
Procedure Calling
CALL .(, , ) with overview;
The procedure name is the same as specified in the procedure generation.
90 P U B L I C
SAP HANA Predictive Analysis Library (PAL)
PAL Functions