> ## Documentation Index
> Fetch the complete documentation index at: https://docs.trychroma.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Schema

## Schema

Collection schema for indexing and encryption configuration.

<span class="text-sm">Properties</span>

<ParamField path="defaults" type="ValueTypes" />

<ParamField path="keys" type="Dict[str, ValueTypes]" />

<ParamField path="cmek" type="Optional[Cmek]" />

***

## Index configs

### FtsIndexConfig

Configuration for Full-Text Search index. No parameters required.

### HnswIndexConfig

Configuration for HNSW vector index.

<span class="text-sm">Properties</span>

<ParamField path="ef_construction" type="Optional[int]" />

<ParamField path="max_neighbors" type="Optional[int]" />

<ParamField path="ef_search" type="Optional[int]" />

<ParamField path="num_threads" type="Optional[int]" />

<ParamField path="batch_size" type="Optional[int]" />

<ParamField path="sync_threshold" type="Optional[int]" />

<ParamField path="resize_factor" type="Optional[float]" />

### SpannIndexConfig

Configuration for SPANN vector index.

<span class="text-sm">Properties</span>

<ParamField path="search_nprobe" type="Optional[int]" />

<ParamField path="write_nprobe" type="Optional[int]" />

<ParamField path="ef_construction" type="Optional[int]" />

<ParamField path="ef_search" type="Optional[int]" />

<ParamField path="max_neighbors" type="Optional[int]" />

<ParamField path="reassign_neighbor_count" type="Optional[int]" />

<ParamField path="split_threshold" type="Optional[int]" />

<ParamField path="merge_threshold" type="Optional[int]" />

### VectorIndexConfig

Configuration for vector index with space, embedding function, and algorithm config.

<span class="text-sm">Properties</span>

<ParamField path="space" type="Optional[Literal[cosine, l2, ip]]" />

<ParamField path="embedding_function" type="Optional[Any]" />

<ParamField path="source_key" type="Optional[str]" />

<ParamField path="hnsw" type="Optional[HnswIndexConfig]" />

<ParamField path="spann" type="Optional[SpannIndexConfig]" />

### SparseVectorIndexConfig

Configuration for sparse vector index.

<span class="text-sm">Properties</span>

<ParamField path="embedding_function" type="Optional[Any]" />

<ParamField path="source_key" type="Optional[str]" />

<ParamField path="bm25" type="Optional[bool]" />

### StringInvertedIndexConfig

Configuration for string inverted index.

### IntInvertedIndexConfig

Configuration for integer inverted index.

### FloatInvertedIndexConfig

Configuration for float inverted index.

### BoolInvertedIndexConfig

Configuration for boolean inverted index.