sklears_decomposition/dictionary_learning/
ksvd_algorithms.rs

1//! K-SVD algorithms for dictionary learning
2
3use scirs2_core::ndarray::Array2;
4#[cfg(feature = "serde")]
5use serde::{Deserialize, Serialize};
6use sklears_core::{error::Result, types::Float};
7
8/// Configuration for K-SVD algorithm
9#[derive(Debug, Clone)]
10#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
11pub struct KSVDConfig {
12    /// Maximum number of iterations
13    pub max_iter: usize,
14    /// Convergence tolerance
15    pub tol: Float,
16    /// Number of non-zero coefficients for sparse coding
17    pub n_nonzero_coefs: usize,
18}
19
20impl Default for KSVDConfig {
21    fn default() -> Self {
22        Self {
23            max_iter: 100,
24            tol: 1e-6,
25            n_nonzero_coefs: 10,
26        }
27    }
28}
29
30/// K-SVD algorithm result
31#[derive(Debug, Clone)]
32#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
33pub struct KSVDResult {
34    /// Updated dictionary
35    pub dictionary: Array2<Float>,
36    /// Sparse codes
37    pub codes: Array2<Float>,
38    /// Reconstruction error
39    pub reconstruction_error: Float,
40    /// Number of iterations
41    pub n_iter: usize,
42}
43
44/// K-SVD encoder
45#[derive(Debug, Clone)]
46#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
47pub struct KSVDEncoder {
48    config: KSVDConfig,
49}
50
51impl KSVDEncoder {
52    pub fn new(config: KSVDConfig) -> Self {
53        Self { config }
54    }
55
56    /// Perform K-SVD dictionary learning
57    pub fn encode(
58        &self,
59        data: &Array2<Float>,
60        initial_dictionary: &Array2<Float>,
61    ) -> Result<KSVDResult> {
62        let (n_samples, _n_features) = data.dim();
63        let n_atoms = initial_dictionary.nrows();
64
65        // Placeholder implementation
66        let dictionary = initial_dictionary.clone();
67        let codes = Array2::zeros((n_atoms, n_samples));
68        let reconstruction_error = 0.0;
69
70        Ok(KSVDResult {
71            dictionary,
72            codes,
73            reconstruction_error,
74            n_iter: 0,
75        })
76    }
77}
sklears_decomposition/dictionary_learning/ksvd_algorithms.rs

sklears_decomposition/dictionary_learning/
ksvd_algorithms.rs
