Semantic Model Workstreams

This guide turns the diagrams into an operational model.

All semantic methods passes through the same five stages:

1. request
2. acquisition / landing
3. transformation
4. catalog / governance
5. reporting / compliance

Common governance gate

Every workstream includes a scan and policy gate before publication:

• PII review
• malware scanning
• copyright / policy checks
• quarantine or redaction when needed

LSA workstream

Request

Define business question, scope, metrics, domains, time window, languages, and governance constraints.

Acquisition / landing

Capture raw landing zone, immutable snapshots, metadata, source ownership, checksums, ACL context, and versioned corpus release.

Transformation

Build TF-IDF or related weighting, then compute truncated SVD:

$$A\approx U_k{\mathrm{\Sigma }}_k{V}_k^{\mathrm{\top }}$$

Outputs include latent document vectors, latent term vectors, reconstruction error, and retrieval-quality diagnostics.

Catalog / governance

Register dataset lineage, model hyperparameters, training context, access controls, and reproducibility metadata.

Reporting / compliance

Report similarity behavior, basis stability, drift, and lineage snapshot.

LSI workstream

Request

Same governance envelope, but focused on retrieval/search use cases.

Transformation

Construct index-time weights, truncated SVD basis, and query projection into latent space:

$$q^{\prime }=q^{\mathrm{\top }}{U}_k{\mathrm{\Sigma }}_k^{-1}$$

Rank and rerank in latent space with evaluation metrics such as precision/recall, nDCG, and MRR.

Reporting / compliance

Track search analytics, freshness, rebuild cadence, and query/audit trails.

LDA workstream

Request

Define topic objectives, labeling expectations, and governance criteria.

Transformation

Infer topic mixtures and topic-word distributions:

$${\theta }_d\sim \mathrm{Dir}(\alpha ),{\varphi }_k\sim \mathrm{Dir}(\eta )$$

Outputs include document-topic weights, topic-word weights, coherence metrics, and human label workflows.

Reporting / compliance

Track topic drift, topic emergence, label changes, and reproducibility bundles.

Why this matters

The diagrams are not just visual aids. They define the operational contract that any semantic build must satisfy before it can become trusted infrastructure.