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31 lines
1.8 KiB
Markdown
31 lines
1.8 KiB
Markdown
# Embeddings
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OmniGraph has **two** embedding clients with different defaults and purposes.
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## Compiler-side client (`omnigraph-compiler/src/embedding.rs`) — query-time normalization
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- Default model: `text-embedding-3-small` (OpenAI-style schema)
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- Env: `NANOGRAPH_EMBED_MODEL`, `OPENAI_API_KEY`, `OPENAI_BASE_URL` (default `https://api.openai.com/v1`), `NANOGRAPH_EMBEDDINGS_MOCK`, `NANOGRAPH_EMBED_TIMEOUT_MS=30000`, `NANOGRAPH_EMBED_RETRY_ATTEMPTS=4`, `NANOGRAPH_EMBED_RETRY_BACKOFF_MS=200`
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- Methods: `embed_text(input, expected_dim)`, `embed_texts(inputs, expected_dim)`
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- Mock mode: deterministic FNV-1a + xorshift64 → L2-normalized vectors
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## Engine-side client (`omnigraph/src/embedding.rs`) — runtime ingest
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- Model: `gemini-embedding-2-preview`
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- Env: `GEMINI_API_KEY`, `OMNIGRAPH_GEMINI_BASE_URL` (default Google generativelanguage v1beta), `OMNIGRAPH_EMBED_TIMEOUT_MS=30000`, `OMNIGRAPH_EMBED_RETRY_ATTEMPTS=4`, `OMNIGRAPH_EMBED_RETRY_BACKOFF_MS=200`, `OMNIGRAPH_EMBEDDINGS_MOCK`
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- Two task types: `embed_query_text` (RETRIEVAL_QUERY) and `embed_document_text` (RETRIEVAL_DOCUMENT)
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- Exponential backoff with retryable detection (timeouts, 429, 5xx)
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## Schema integration
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Mark a Vector property with `@embed("source_text_property")`. At ingest, the engine pulls the source text and writes the embedding into the vector column. Stored as L2-normalized FixedSizeList(Float32, dim).
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## CLI `omnigraph embed` (offline file pipeline)
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Operates on **JSONL files** (not on a graph). Three modes (mutually exclusive):
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- (default) `fill_missing` — only embed rows whose target field is empty
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- `--reembed-all` — overwrite all
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- `--clean` — strip embeddings
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Inputs are either a single seed manifest YAML or `--input/--output/--spec`. Selectors `--type T`, `--select T:field=value` filter rows. Streams JSONL → JSONL.
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