Chunks are pieces of documents split using some specified splitter. This is typically done before embedding.

Matrix decomposition reduces the number of dimensions in a vector, to improve relevance and reduce computation required.

| Parameter| Example| Description|

|----------------|---------------------------------|----------------------------------------------------------|

|`project_name`|`'My First PostgresML Project'`| The project name used to train models in`pgml.train()`.|

|`vector`|`ARRAY[0.1, 0.45, 1.0]`| The feature vectorthat needs decomposition.|

|`vector`|`ARRAY[0.1, 0.45, 1.0]`| The feature vectorto transform.|

SELECTpgml.decompose('My PCA', ARRAY[0.1,2.0,5.0]);

!!! example

SELECT*,

pgml.decompose(

'Buy it Again',

ARRAY[

user.location_id,

NOW()-user.created_at,

user.total_purchases_in_dollars

]

)AS buying_score

FROM users

WHERE tenant_id=5

ORDER BY buying_score

LIMIT25;

!!!