[source] # Truncated SVD Truncated Singular Value Decomposition (SVD) is a matrix factorization and dimensionality reduction technique that generalizes eigendecomposition to general matrices. When applied to datasets of document term frequency vectors, the technique is called Latent Semantic Analysis (LSA) and computes a statistical model of relationships between words. !!! note Note that the [Tensor extension](https://pecl.php.net/package/Tensor) is required to use this transformer. **Interfaces:** [Transformer](api.md#transformer), [Stateful](api.md#stateful), [Persistable](../persistable.md) **Data Type Compatibility:** Continuous only ## Parameters | # | Name | Default | Type | Description | |---|---|---|---|---| | 1 | dimensions | | int | The target number of dimensions to project onto. | ## Example ```php use Rubix\ML\Transformers\TruncatedSVD; $transformer = new TruncatedSVD(100); ``` ## Additional Methods Return the proportion of information lost due to the transformation: ```php public lossiness() : ?float ``` ### References [^1]: S. Deerwater et al. (1990). Indexing by Latent Semantic Analysis.