LiNA

class lingam.LiNA(w_threshold=0.3, lambda1=0.1, lambda2=0.1, loss_type='laplace', max_iter=100, h_tol=1e-08, rho_max=1e+16)

Implementation of LiNA Algorithm [1]_

References

[1]	Y. Zeng, S. Shimizu, R. Cai, F. Xie, M. Yamamoto and Z. Hao. Causal Discovery with Multi-Domain LiNGAM for Latent Factors. In Proc. of the Thirtieth International Joint Conference on Artificial Intelligence (IJCAI-21), 2021: 2097–2103.

__init__(w_threshold=0.3, lambda1=0.1, lambda2=0.1, loss_type='laplace', max_iter=100, h_tol=1e-08, rho_max=1e+16)

Construct a LiNA model.

Parameters:

• w_threshold (float (default=0.3)) – Drop edge if the weight btw. latent factors is less than w_threshold.
• lambda1 (float, optional (default=0.1)) – L1 penalty parameter.
• lambda2 (float, (default=0.1)) – L2 penalty parameter.
• loss_type (str, (default='laplace')) – Type of distribution of the noise.
• max_iter (int, (default=100)) – Maximum number of dual ascent steps.
• h_tol (float, (default=1e-8)) – Tolerance parameter of the acyclicity constraint.
• rho_max (float, (default=1e+16)) – Maximum value of the regularization parameter rho.

adjacency_matrix_

Estimated adjacency matrix between latent factors.

Returns:adjacency_matrix_ – The adjacency matrix of latent factors, where n_features_latent is the number of latent factors. Return type:array-like, shape (n_features_latent, n_features_latent)

fit(X, G_sign, scale)

Fit the model to X with measurement structure and latent factors’ scales.

Parameters:

• X (array-like, shape (n_samples, n_features)) – Training data, where n_samples is the number of samples and n_features is the number of measurement features.
• G_sign (array-like, shape (n_features, n_features_latent)) – Measurement structure matrix, where n_features_latent is the number of latent factors and n_features is the number of measurement features.
• scale (array-like, shape (1, n_features_latent)) – Scales of the latent factors.

Returns:

self – Returns the instance of self.

Return type:

object

measurement_matrix_

Estimated measurement matrix between measurement variables and latent factors.

Returns:measurement_matrix_ – The measurement matrix between measurement variables and latent factors, where n_features_latent is the number of latent factors and n_features is the number of measurement variables. Return type:array-like, shape (n_features, n_features_latent)

class lingam.MDLiNA(w_threshold=0.3, lambda1=0.1, lambda2=0.1, loss_type='laplace', max_iter=100, h_tol=1e-08, rho_max=1e+16, no_of_domain=2, no_of_latent_1domain=3)

Implementation of MD-LiNA Algorithm [1]_

References

[1]	Y. Zeng, S. Shimizu, R. Cai, F. Xie, M. Yamamoto and Z. Hao. Causal Discovery with Multi-Domain LiNGAM for Latent Factors. In Proc. of the Thirtieth International Joint Conference on Artificial Intelligence (IJCAI-21), 2021: 2097–2103.

__init__(w_threshold=0.3, lambda1=0.1, lambda2=0.1, loss_type='laplace', max_iter=100, h_tol=1e-08, rho_max=1e+16, no_of_domain=2, no_of_latent_1domain=3)

Construct an MD-LiNA model.

Parameters:

• w_threshold (float (default=0.3)) – Drop edge if the weight btw. latent factors is less than w_threshold.
• lambda1 (float, optional (default=0.1)) – L1 penalty parameter.
• lambda2 (float, (default=0.1)) – L2 penalty parameter.
• loss_type (str, (default='laplace')) – Type of distribution of the noise.
• max_iter (int, (default=100)) – Maximum number of dual ascent steps.
• h_tol (float, (default=1e-8)) – Tolerance parameter of the acyclicity constraint.
• rho_max (float, (default=1e+16)) – Maximum value of the regularization parameter rho.
• no_of_domain (int, (default=2)) – Number of domains.
• no_of_latent_1domain (float, (default=3)) – Number of latent factors in a domain.

adjacency_matrix_

Estimated adjacency matrix between latent factors of interest, which is shared by all domains.

Returns:adjacency_matrix_ – The adjacency matrix of latent factors of interest, where n_features_latent_1domain is the number of latent factors of interest. Return type:array-like, shape (n_features_latent_1domain, n_features_latent_1domain)

fit(X, G_sign, scale)

Fit the model to X with measurement structure and latent factors’ scales.

Parameters:

• X (array-like, shape (n_samples, n_features)) – Training data, where n_samples is the number of samples of all domains and n_features is the number of features of all domains.
• G_sign (array-like, shape (n_features, n_features_latent)) – Measurement structure matrix, where n_features_latent is the number of latent factors of all domains and n_features is the number of measurement variables of all domains.
• scale (array-like, shape (1, n_features_latent)) – Scales of the latent factors.

Returns:

self – Returns the instance of self.

Return type:

object

measurement_matrix_

Estimated measurement matrix between measurement variables and latent factors from all domains.

Returns:measurement_matrix_ – The measurement matrix between measurement variables and latent factors, where n_features_latent is the number of latent factors and n_features is the number of measurement variables from all domains. Return type:array-like, shape (n_features, n_features_latent)