numcodecs_random_projection

Enum RandomProjectionKind

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pub enum RandomProjectionKind {
    Gaussian,
    Sparse {
        density: Option<OpenClosedUnit<f64>>,
    },
}
Expand description

Projection kind that is used to generate the random projection matrix

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Gaussian

The random projection matrix is dense and its components are sampled from N(0, 1/k)

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Sparse

The random projection matrix is sparse where only density% of entries are non-zero.

The matrix’s components are sampled from

  • -sqrt(1 / (k * density)) with probability density/2
  • 0 with probability 1-density
  • +sqrt(1 / (k * density)) with probability density/2

Fields

§density: Option<OpenClosedUnit<f64>>

The density of the sparse projection matrix.

Setting density to Some(1.0/3.0) reproduces the settings by Achlioptas 1. If density is None, it is set to 1/sqrt(d), the minimum density as recommended by Li et al 2.


  1. Achlioptas, D. (2003). Database-friendly random projections: Johnson-Lindenstrauss with binary coins. Journal of Computer and System Sciences, 66(4), 671-687. Available from: doi:10.1016/S0022-0000(03)00025-4

  2. Li, P., Hastie, T. J., and Church, K. W. (2006). Very sparse random projections. In Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining (KDD ’06). Association for Computing Machinery, New York, NY, USA, 287–296. Available from: doi:10.1145/1150402.1150436

Trait Implementations§

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impl Clone for RandomProjectionKind

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fn clone(&self) -> RandomProjectionKind

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'de> Deserialize<'de> for RandomProjectionKind

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl JsonSchema for RandomProjectionKind

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fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema. Read more
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fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type. Read more
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fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type. Read more
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fn always_inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword. Read more
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impl Serialize for RandomProjectionKind

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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type Owned = T

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